Remove warning about unsupported expression types (#266)

* remove warning about unsupported expression for _meta.get_field()

* lint

.gitignore

@@ -8,4 +8,7 @@ out/
 build/
 dist/
 pip-wheel-metadata/
-.pytest_cache/
+.pytest_cache/
+/.envrc
+/.direnv
+django-sources/

.gitmodules

@@ -1,4 +0,0 @@
-[submodule "django-sources"]
-	path = django-sources
-	url = https://github.com/django/django.git
-	branch = stable/2.2.x

.travis.yml

@@ -8,13 +8,20 @@ jobs:
       python: 3.7
       script: 'pytest'
 
-    - name: Typecheck Django test suite with python 3.7
+    - name: Typecheck Django 3.0 test suite with python 3.7
       python: 3.7
-      script: 'python ./scripts/typecheck_tests.py'
+      script: |
+        python ./scripts/typecheck_tests.py --django_version=3.0
 
-    - name: Typecheck Django test suite with python 3.6
+    - name: Typecheck Django 3.0 test suite with python 3.6
       python: 3.6
-      script: 'python ./scripts/typecheck_tests.py'
+      script: |
+        python ./scripts/typecheck_tests.py --django_version=3.0
+
+    - name: Typecheck Django 2.2 test suite with python 3.7
+      python: 3.7
+      script: |
+        python ./scripts/typecheck_tests.py --django_version=2.2
 
     - name: Mypy for plugin code
       python: 3.7
@@ -37,8 +44,9 @@ jobs:
       script: 'isort --check --diff'
 
 before_install: |
-  sudo apt update
+  sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable -y
-  sudo apt install binutils libproj-dev gdal-bin
+  sudo apt-get update
+  sudo apt-get install -y binutils libproj-dev gdal-bin
   pip install -U pip setuptools wheel
 install: |
   pip install -r ./dev-requirements.txt

README.md

@@ -2,7 +2,7 @@
 
 # pep484 stubs for Django framework
 
-[![Build Status](https://travis-ci.org/typeddjango/django-stubs.svg?branch=master)](https://travis-ci.org/typeddjango/django-stubs)
+[![Build Status](https://travis-ci.com/typeddjango/django-stubs.svg?branch=master)](https://travis-ci.com/typeddjango/django-stubs)
 [![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
 [![Gitter](https://badges.gitter.im/mypy-django/Lobby.svg)](https://gitter.im/mypy-django/Lobby)
 
@@ -22,6 +22,7 @@ pip install django-stubs
 
 | django-stubs | mypy version | django version | python version
 | ------------ | ---- | ---- | ---- |
+| 1.3.0 | 0.750 | 2.2.x | ^3.6
 | 1.2.0 | 0.730 | 2.2.x | ^3.6
 | 1.1.0 | 0.720 | 2.2.x | ^3.6
 | 0.12.x | old semantic analyzer (<0.711), dmypy support | 2.1.x | ^3.6
@@ -52,12 +53,6 @@ django_settings_module = mysettings
 
 Where `mysettings` is a value of `DJANGO_SETTINGS_MODULE` (with or without quotes)
 
-You might also need to explicitly tweak your `PYTHONPATH` the very same way `django` does it internally in case you have troubles with mypy / django plugin not finding your settings module. Try adding the root path of your project to your `PYTHONPATH` environment variable like so:
-
-```bash
-PYTHONPATH=${PYTHONPATH}:${PWD}
-```
-
 Current implementation uses Django runtime to extract models information, so it will crash, if your installed apps `models.py` is not correct. For this same reason, you cannot use `reveal_type` inside global scope of any Python file that will be executed for `django.setup()`. 
 
 In other words, if your `manage.py runserver` crashes, mypy will crash too. 
@@ -75,7 +70,7 @@ class MyUserManager(models.Manager['MyUser']):
     pass
 
 class MyUser(models.Model):
-    objects = UserManager()
+    objects = MyUserManager()
 ```
 
 work, which should make a error messages a bit better. 

dev-requirements.txt

@@ -1,7 +1,8 @@
 black
 pytest-mypy-plugins==1.1.0
 psycopg2
-flake8==3.7.8
+flake8==3.7.9
 flake8-pyi==19.3.0
 isort==4.3.21
+gitpython==3.0.5
 -e .

django-stubs/apps/config.pyi

@@ -1,5 +1,6 @@
 from typing import Any, Iterator, Type, Optional, Dict
 
+from django.apps.registry import Apps
 from django.db.models.base import Model
 
 MODELS_MODULE_NAME: str
@@ -7,11 +8,11 @@ MODELS_MODULE_NAME: str
 class AppConfig:
     name: str = ...
     module: Optional[Any] = ...
-    apps: None = ...
+    apps: Optional[Apps] = ...
     label: str = ...
     verbose_name: str = ...
     path: str = ...
-    models_module: None = ...
+    models_module: Optional[str] = ...
     models: Dict[str, Type[Model]] = ...
     def __init__(self, app_name: str, app_module: Optional[Any]) -> None: ...
     @classmethod

django-stubs/apps/registry.pyi

@@ -1,24 +1,22 @@
 import threading
-from collections import OrderedDict
+from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Type, Union
-from typing import Any, Callable, DefaultDict, Dict, Iterable, List, Optional, Tuple, Type, Union
 
-from django.db.migrations.state import AppConfigStub
 from django.db.models.base import Model
 
 from .config import AppConfig
 
 class Apps:
-    all_models: Dict[str, OrderedDict[str, Type[Model]]] = ...
+    all_models: Dict[str, Dict[str, Type[Model]]] = ...
-    app_configs: OrderedDict[str, AppConfig] = ...
+    app_configs: Dict[str, AppConfig] = ...
     stored_app_configs: List[Any] = ...
     apps_ready: bool = ...
     ready_event: threading.Event = ...
     loading: bool = ...
-    _pending_operations: DefaultDict[Tuple[str, str], List]
+    _pending_operations: Dict[Tuple[str, str], List]
     models_ready: bool = ...
     ready: bool = ...
-    def __init__(self, installed_apps: Optional[Union[List[AppConfigStub], List[str], Tuple]] = ...) -> None: ...
+    def __init__(self, installed_apps: Optional[Iterable[Union[AppConfig, str]]] = ...) -> None: ...
-    def populate(self, installed_apps: Union[List[AppConfigStub], List[str], Tuple] = ...) -> None: ...
+    def populate(self, installed_apps: Iterable[Union[AppConfig, str]] = ...) -> None: ...
     def check_apps_ready(self) -> None: ...
     def check_models_ready(self) -> None: ...
     def get_app_configs(self) -> Iterable[AppConfig]: ...
@@ -31,9 +29,9 @@ class Apps:
     def get_containing_app_config(self, object_name: str) -> Optional[AppConfig]: ...
     def get_registered_model(self, app_label: str, model_name: str) -> Type[Model]: ...
     def get_swappable_settings_name(self, to_string: str) -> Optional[str]: ...
-    def set_available_apps(self, available: List[str]) -> None: ...
+    def set_available_apps(self, available: Iterable[str]) -> None: ...
     def unset_available_apps(self) -> None: ...
-    def set_installed_apps(self, installed: Union[List[str], Tuple[str]]) -> None: ...
+    def set_installed_apps(self, installed: Iterable[str]) -> None: ...
     def unset_installed_apps(self) -> None: ...
     def clear_cache(self) -> None: ...
     def lazy_model_operation(self, function: Callable, *model_keys: Any) -> None: ...

django-stubs/conf/global_settings.pyi

@@ -345,7 +345,7 @@ SESSION_COOKIE_PATH = "/"
 SESSION_COOKIE_HTTPONLY = True
 # Whether to set the flag restricting cookie leaks on cross-site requests.
 # This can be 'Lax', 'Strict', or None to disable the flag.
-SESSION_COOKIE_SAMESITE = "Lax"
+SESSION_COOKIE_SAMESITE: Optional[str] = ...
 # Whether to save the session data on every request.
 SESSION_SAVE_EVERY_REQUEST = False
 # Whether a user's session cookie expires when the Web browser is closed.
@@ -413,7 +413,7 @@ CSRF_COOKIE_DOMAIN = None
 CSRF_COOKIE_PATH = "/"
 CSRF_COOKIE_SECURE = False
 CSRF_COOKIE_HTTPONLY = False
-CSRF_COOKIE_SAMESITE = "Lax"
+CSRF_COOKIE_SAMESITE: Optional[str] = ...
 CSRF_HEADER_NAME = "HTTP_X_CSRFTOKEN"
 CSRF_TRUSTED_ORIGINS: List[str] = ...
 CSRF_USE_SESSIONS = False

django-stubs/contrib/admin/checks.pyi

@@ -1,11 +1,13 @@
-from typing import Any, List, Union
+from typing import Any, List, Union, Iterable, Optional
 
 from django.contrib.admin.options import BaseModelAdmin
 from django.core.checks.messages import Error
 
+from django.apps.config import AppConfig
+
 _CheckError = Union[str, Error]
 
-def check_admin_app(app_configs: None, **kwargs: Any) -> List[_CheckError]: ...
+def check_admin_app(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[_CheckError]: ...
 def check_dependencies(**kwargs: Any) -> List[_CheckError]: ...
 
 class BaseModelAdminChecks:

django-stubs/contrib/admin/filters.pyi

@@ -24,7 +24,7 @@ class SimpleListFilter(ListFilter):
     parameter_name: Any = ...
     lookup_choices: Any = ...
     def value(self) -> Optional[str]: ...
-    def lookups(self, request: Any, model_admin: Any) -> None: ...
+    def lookups(self, request: Any, model_admin: Any) -> List[Tuple[Any, str]]: ...
 
 class FieldListFilter(ListFilter):
     field: Field = ...

django-stubs/contrib/admin/options.pyi

@@ -86,7 +86,7 @@ class BaseModelAdmin:
     def get_sortable_by(self, request: HttpRequest) -> Union[List[Callable], List[str], Tuple]: ...
     def lookup_allowed(self, lookup: str, value: str) -> bool: ...
     def to_field_allowed(self, request: HttpRequest, to_field: str) -> bool: ...
-    def has_add_permission(self, request: HttpRequest, obj: Optional[Model] = ...) -> bool: ...
+    def has_add_permission(self, request: HttpRequest) -> bool: ...
     def has_change_permission(self, request: HttpRequest, obj: Optional[Model] = ...) -> bool: ...
     def has_delete_permission(self, request: HttpRequest, obj: Optional[Model] = ...) -> bool: ...
     def has_view_permission(self, request: HttpRequest, obj: Optional[Model] = ...) -> bool: ...

django-stubs/contrib/admin/sites.pyi

@@ -8,6 +8,8 @@ from django.template.response import TemplateResponse
 from django.urls.resolvers import URLResolver
 from django.utils.functional import LazyObject
 
+from django.apps.config import AppConfig
+
 all_sites: Any
 
 class AlreadyRegistered(Exception): ...
@@ -28,7 +30,7 @@ class AdminSite:
     name: str = ...
     _registry: Dict[Type[Model], ModelAdmin]
     def __init__(self, name: str = ...) -> None: ...
-    def check(self, app_configs: None) -> List[Any]: ...
+    def check(self, app_configs: Optional[Iterable[AppConfig]]) -> List[Any]: ...
     def register(
         self,
         model_or_iterable: Union[Type[Model], Iterable[Type[Model]]],
@@ -37,7 +39,7 @@ class AdminSite:
     ) -> None: ...
     def unregister(self, model_or_iterable: Union[Type[Model], Iterable[Type[Model]]]) -> None: ...
     def is_registered(self, model: Type[Model]) -> bool: ...
-    def add_action(self, action: Callable, name: None = ...) -> None: ...
+    def add_action(self, action: Callable, name: Optional[str] = ...) -> None: ...
     def disable_action(self, name: str) -> None: ...
     def get_action(self, name: str) -> Callable: ...
     @property
@@ -52,14 +54,20 @@ class AdminSite:
     @property
     def urls(self) -> Tuple[List[URLResolver], str, str]: ...
     def each_context(self, request: Any): ...
-    def password_change(self, request: WSGIRequest, extra_context: Dict[str, str] = ...) -> TemplateResponse: ...
+    def password_change(
-    def password_change_done(self, request: WSGIRequest, extra_context: None = ...) -> TemplateResponse: ...
+        self, request: WSGIRequest, extra_context: Optional[Dict[str, Any]] = ...
+    ) -> TemplateResponse: ...
+    def password_change_done(
+        self, request: WSGIRequest, extra_context: Optional[Dict[str, Any]] = ...
+    ) -> TemplateResponse: ...
     def i18n_javascript(self, request: WSGIRequest, extra_context: Optional[Dict[Any, Any]] = ...) -> HttpResponse: ...
-    def logout(self, request: WSGIRequest, extra_context: None = ...) -> TemplateResponse: ...
+    def logout(self, request: WSGIRequest, extra_context: Optional[Dict[str, Any]] = ...) -> TemplateResponse: ...
-    def login(self, request: WSGIRequest, extra_context: None = ...) -> HttpResponse: ...
+    def login(self, request: WSGIRequest, extra_context: Optional[Dict[str, Any]] = ...) -> HttpResponse: ...
     def get_app_list(self, request: WSGIRequest) -> List[Any]: ...
-    def index(self, request: WSGIRequest, extra_context: Optional[Dict[str, str]] = ...) -> TemplateResponse: ...
+    def index(self, request: WSGIRequest, extra_context: Optional[Dict[str, Any]] = ...) -> TemplateResponse: ...
-    def app_index(self, request: WSGIRequest, app_label: str, extra_context: None = ...) -> TemplateResponse: ...
+    def app_index(
+        self, request: WSGIRequest, app_label: str, extra_context: Optional[Dict[str, Any]] = ...
+    ) -> TemplateResponse: ...
 
 class DefaultAdminSite(LazyObject): ...
 

django-stubs/contrib/admin/templatetags/admin_list.pyi

@@ -27,7 +27,7 @@ class ResultList(list):
 def results(cl: ChangeList) -> Iterator[ResultList]: ...
 def result_hidden_fields(cl: ChangeList) -> Iterator[BoundField]: ...
 def result_list(
-    cl: ChangeList
+    cl: ChangeList,
 ) -> Dict[
     str, Union[List[Dict[str, Optional[Union[int, str]]]], List[ResultList], List[BoundField], ChangeList, int]
 ]: ...

django-stubs/contrib/admin/utils.pyi

@@ -9,12 +9,10 @@ from django.contrib.auth.forms import AdminPasswordChangeForm
 from django.core.handlers.wsgi import WSGIRequest
 from django.db.models.base import Model
 from django.db.models.deletion import Collector
-from django.db.models.fields.mixins import FieldCacheMixin
 from django.db.models.fields.reverse_related import ManyToOneRel
 from django.db.models.options import Options
 from django.db.models.query import QuerySet
 from django.forms.forms import BaseForm
-from django.utils.safestring import SafeText
 
 from django.db.models.fields import Field, reverse_related
 
@@ -27,7 +25,7 @@ def unquote(s: str) -> str: ...
 def flatten(fields: Any) -> List[Union[Callable, str]]: ...
 def flatten_fieldsets(fieldsets: Any) -> List[Union[Callable, str]]: ...
 def get_deleted_objects(
-    objs: QuerySet, request: WSGIRequest, admin_site: AdminSite
+    objs: Sequence[Optional[Model]], request: WSGIRequest, admin_site: AdminSite
 ) -> Tuple[List[Any], Dict[Any, Any], Set[Any], List[Any]]: ...
 
 class NestedObjects(Collector):
@@ -41,22 +39,14 @@ class NestedObjects(Collector):
     model_objs: Any = ...
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
     def add_edge(self, source: Optional[Model], target: Model) -> None: ...
-    def collect(
+    def related_objects(self, related: ManyToOneRel, objs: Sequence[Optional[Model]]) -> QuerySet: ...
-        self,
+    def nested(self, format_callback: Callable = ...) -> List[Any]: ...
-        objs: Union[Sequence[Optional[Model]], QuerySet],
-        source: Optional[Type[Model]] = ...,
-        source_attr: Optional[str] = ...,
-        **kwargs: Any
-    ) -> None: ...
-    def related_objects(self, related: ManyToOneRel, objs: List[Model]) -> QuerySet: ...
-    def nested(self, format_callback: Callable = ...) -> Union[List[SafeText], List[int]]: ...
-    def can_fast_delete(self, *args: Any, **kwargs: Any) -> bool: ...
 
 def model_format_dict(obj: Any): ...
 def model_ngettext(obj: Union[Options, QuerySet], n: Optional[int] = ...) -> str: ...
 def lookup_field(
     name: Union[Callable, str], obj: Model, model_admin: BaseModelAdmin = ...
-) -> Tuple[Optional[Field], Callable, Callable]: ...
+) -> Tuple[Optional[Field], Any, Any]: ...
 def label_for_field(
     name: Union[Callable, str],
     model: Type[Model],
@@ -65,16 +55,14 @@ def label_for_field(
     form: Optional[BaseForm] = ...,
 ) -> Union[Tuple[Optional[str], Union[Callable, Type[str]]], str]: ...
 def help_text_for_field(name: str, model: Type[Model]) -> str: ...
-def display_for_field(
+def display_for_field(value: Any, field: Field, empty_value_display: str) -> str: ...
-    value: Any, field: Union[Field, reverse_related.OneToOneRel], empty_value_display: str
-) -> str: ...
 def display_for_value(value: Any, empty_value_display: str, boolean: bool = ...) -> str: ...
 
 class NotRelationField(Exception): ...
 
 def get_model_from_relation(field: Union[Field, reverse_related.ForeignObjectRel]) -> Type[Model]: ...
 def reverse_field_path(model: Type[Model], path: str) -> Tuple[Type[Model], str]: ...
-def get_fields_from_path(model: Type[Model], path: str) -> List[Union[Field, FieldCacheMixin]]: ...
+def get_fields_from_path(model: Type[Model], path: str) -> List[Field]: ...
 def construct_change_message(
     form: AdminPasswordChangeForm, formsets: None, add: bool
 ) -> List[Dict[str, Dict[str, List[str]]]]: ...

django-stubs/contrib/admin/views/main.pyi

@@ -81,9 +81,7 @@ class ChangeList:
     paginator: Any = ...
     def get_results(self, request: WSGIRequest) -> None: ...
     def get_ordering_field(self, field_name: Union[Callable, str]) -> Optional[Union[CombinedExpression, str]]: ...
-    def get_ordering(
+    def get_ordering(self, request: WSGIRequest, queryset: QuerySet) -> List[Union[OrderBy, Combinable, str]]: ...
-        self, request: WSGIRequest, queryset: QuerySet
-    ) -> Union[List[Union[Combinable, str]], List[Union[OrderBy, str]]]: ...
     def get_ordering_field_columns(self) -> OrderedDict: ...
     def get_queryset(self, request: WSGIRequest) -> QuerySet: ...
     def apply_select_related(self, qs: QuerySet) -> QuerySet: ...

django-stubs/contrib/auth/backends.pyi

@@ -1,23 +1,34 @@
 from typing import Any, Optional, Set, Union
 
 from django.contrib.auth.base_user import AbstractBaseUser
-from django.contrib.auth.models import AnonymousUser, User
+from django.contrib.auth.models import AnonymousUser, User, Permission
+
+from django.db.models.base import Model
+
+_AnyUser = Union[Model, AnonymousUser]
 
 UserModel: Any
 
-class ModelBackend:
+class BaseBackend:
     def authenticate(
-        self, request: Any, username: Optional[Union[int, str]] = ..., password: Optional[str] = ..., **kwargs: Any
+        self, request: Any, username: Optional[str] = ..., password: Optional[str] = ..., **kwargs: Any
     ) -> Optional[AbstractBaseUser]: ...
-    def user_can_authenticate(self, user: Optional[AbstractBaseUser]) -> bool: ...
+    def get_user(self, user_id: int) -> Optional[AbstractBaseUser]: ...
-    def get_user_permissions(self, user_obj: AbstractBaseUser, obj: None = ...) -> Set[str]: ...
+    def get_user_permissions(self, user_obj: _AnyUser, obj: Optional[Model] = ...) -> Set[str]: ...
-    def get_group_permissions(self, user_obj: AbstractBaseUser, obj: None = ...) -> Set[str]: ...
+    def get_group_permissions(self, user_obj: _AnyUser, obj: Optional[Model] = ...) -> Set[str]: ...
-    def get_all_permissions(self, user_obj: AbstractBaseUser, obj: Optional[str] = ...) -> Set[str]: ...
+    def get_all_permissions(self, user_obj: _AnyUser, obj: Optional[Model] = ...) -> Set[str]: ...
-    def has_perm(
+    def has_perm(self, user_obj: _AnyUser, perm: str, obj: Optional[Model] = ...) -> bool: ...
-        self, user_obj: Union[AbstractBaseUser, AnonymousUser], perm: str, obj: Optional[str] = ...
+
-    ) -> bool: ...
+class ModelBackend(BaseBackend):
-    def has_module_perms(self, user_obj: Union[AbstractBaseUser, AnonymousUser], app_label: str) -> bool: ...
+    def has_module_perms(self, user_obj: _AnyUser, app_label: str) -> bool: ...
-    def get_user(self, user_id: int) -> AbstractBaseUser: ...
+    def user_can_authenticate(self, user: Optional[_AnyUser]) -> bool: ...
+    def with_perm(
+        self,
+        perm: Union[str, Permission],
+        is_active: bool = ...,
+        include_superusers: bool = ...,
+        obj: Optional[Model] = ...,
+    ): ...
 
 class AllowAllUsersModelBackend(ModelBackend): ...
 

django-stubs/contrib/auth/base_user.pyi

@@ -13,11 +13,10 @@ class BaseUserManager(models.Manager[_T]):
     def get_by_natural_key(self, username: Optional[str]) -> _T: ...
 
 class AbstractBaseUser(models.Model):
+    REQUIRED_FIELDS: List[str] = ...
+
     password = models.CharField(max_length=128)
     last_login = models.DateTimeField(blank=True, null=True)
-
-    REQUIRED_FIELDS: List[str] = ...
-    class Meta: ...
     def get_username(self) -> str: ...
     def natural_key(self) -> Tuple[str]: ...
     @property

django-stubs/contrib/auth/checks.pyi

@@ -1,6 +1,8 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import CheckMessage
 
-def check_user_model(app_configs: None = ..., **kwargs: Any) -> List[CheckMessage]: ...
+from django.apps.config import AppConfig
-def check_models_permissions(app_configs: None = ..., **kwargs: Any) -> List[Any]: ...
+
+def check_user_model(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...
+def check_models_permissions(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...

django-stubs/contrib/auth/mixins.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Callable, List
+from typing import Any, Callable, List, Optional
 
 from django import http
 from django.http.response import HttpResponse, HttpResponseRedirect
@@ -23,6 +23,6 @@ class PermissionRequiredMixin(AccessMixin):
     def dispatch(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse: ...
 
 class UserPassesTestMixin(AccessMixin):
-    def test_func(self) -> None: ...
+    def test_func(self) -> Optional[bool]: ...
     def get_test_func(self) -> Callable: ...
     def dispatch(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse: ...

django-stubs/contrib/auth/models.pyi

@@ -1,5 +1,6 @@
-from typing import Any, Collection, Optional, Set, Tuple, Type, TypeVar
+from typing import Any, Collection, Optional, Set, Tuple, Type, TypeVar, Union
 
+from django.contrib.auth.backends import ModelBackend
 from django.contrib.auth.base_user import AbstractBaseUser as AbstractBaseUser, BaseUserManager as BaseUserManager
 from django.contrib.auth.validators import UnicodeUsernameValidator
 from django.contrib.contenttypes.models import ContentType
@@ -8,22 +9,28 @@ from django.db.models.manager import EmptyManager
 
 from django.db import models
 
+_AnyUser = Union[Model, "AnonymousUser"]
+
 def update_last_login(sender: Type[AbstractBaseUser], user: AbstractBaseUser, **kwargs: Any) -> None: ...
 
-class PermissionManager(models.Manager):
+class PermissionManager(models.Manager["Permission"]):
     def get_by_natural_key(self, codename: str, app_label: str, model: str) -> Permission: ...
 
 class Permission(models.Model):
     content_type_id: int
+    objects: PermissionManager
+
     name = models.CharField(max_length=255)
     content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
     codename = models.CharField(max_length=100)
     def natural_key(self) -> Tuple[str, str, str]: ...
 
-class GroupManager(models.Manager):
+class GroupManager(models.Manager["Group"]):
     def get_by_natural_key(self, name: str) -> Group: ...
 
 class Group(models.Model):
+    objects: GroupManager
+
     name = models.CharField(max_length=150)
     permissions = models.ManyToManyField(Permission)
     def natural_key(self): ...
@@ -37,15 +44,24 @@ class UserManager(BaseUserManager[_T]):
     def create_superuser(
         self, username: str, email: Optional[str], password: Optional[str], **extra_fields: Any
     ) -> _T: ...
+    def with_perm(
+        self,
+        perm: Union[str, Permission],
+        is_active: bool = ...,
+        include_superusers: bool = ...,
+        backend: Optional[Union[Type[ModelBackend], str]] = ...,
+        obj: Optional[Model] = ...,
+    ): ...
 
 class PermissionsMixin(models.Model):
     is_superuser = models.BooleanField()
-    groups: models.ManyToManyField = models.ManyToManyField(Group)
+    groups = models.ManyToManyField(Group)
-    user_permissions: models.ManyToManyField = models.ManyToManyField(Permission)
+    user_permissions = models.ManyToManyField(Permission)
-    def get_group_permissions(self, obj: None = ...) -> Set[str]: ...
+    def get_user_permissions(self, obj: Optional[_AnyUser] = ...) -> Set[str]: ...
-    def get_all_permissions(self, obj: Optional[str] = ...) -> Set[str]: ...
+    def get_group_permissions(self, obj: Optional[_AnyUser] = ...) -> Set[str]: ...
-    def has_perm(self, perm: str, obj: Optional[str] = ...) -> bool: ...
+    def get_all_permissions(self, obj: Optional[_AnyUser] = ...) -> Set[str]: ...
-    def has_perms(self, perm_list: Collection[str], obj: None = ...) -> bool: ...
+    def has_perm(self, perm: str, obj: Optional[_AnyUser] = ...) -> bool: ...
+    def has_perms(self, perm_list: Collection[str], obj: Optional[_AnyUser] = ...) -> bool: ...
     def has_module_perms(self, app_label: str) -> bool: ...
 
 class AbstractUser(AbstractBaseUser, PermissionsMixin):  # type: ignore
@@ -82,10 +98,11 @@ class AnonymousUser:
     def groups(self) -> EmptyManager: ...
     @property
     def user_permissions(self) -> EmptyManager: ...
-    def get_group_permissions(self, obj: None = ...) -> Set[Any]: ...
+    def get_user_permissions(self, obj: Optional[_AnyUser] = ...) -> Set[str]: ...
-    def get_all_permissions(self, obj: Any = ...) -> Set[str]: ...
+    def get_group_permissions(self, obj: Optional[_AnyUser] = ...) -> Set[Any]: ...
-    def has_perm(self, perm: str, obj: None = ...) -> bool: ...
+    def get_all_permissions(self, obj: Optional[_AnyUser] = ...) -> Set[str]: ...
-    def has_perms(self, perm_list: Collection[str], obj: None = ...) -> bool: ...
+    def has_perm(self, perm: str, obj: Optional[_AnyUser] = ...) -> bool: ...
+    def has_perms(self, perm_list: Collection[str], obj: Optional[_AnyUser] = ...) -> bool: ...
     def has_module_perms(self, module: str) -> bool: ...
     @property
     def is_anonymous(self) -> bool: ...

django-stubs/contrib/auth/views.pyi

@@ -55,6 +55,7 @@ class PasswordResetDoneView(PasswordContextMixin, TemplateView):
 class PasswordResetConfirmView(PasswordContextMixin, FormView):
     post_reset_login: bool = ...
     post_reset_login_backend: Any = ...
+    reset_url_token: str = ...
     title: Any = ...
     token_generator: Any = ...
     validlink: bool = ...

django-stubs/contrib/contenttypes/checks.pyi

@@ -1,4 +1,6 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
-def check_generic_foreign_keys(app_configs: None = ..., **kwargs: Any) -> List[Any]: ...
+from django.apps.config import AppConfig
-def check_model_name_lengths(app_configs: None = ..., **kwargs: Any) -> List[Any]: ...
+
+def check_generic_foreign_keys(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...
+def check_model_name_lengths(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...

django-stubs/contrib/postgres/constraints.pyi

@@ -0,0 +1,18 @@
+from typing import Optional, Sequence, Tuple, Union
+
+from django.db.models.constraints import BaseConstraint
+from django.db.models.expressions import Combinable
+from django.db.models.query_utils import Q
+
+class ExclusionConstraint(BaseConstraint):
+    expressions: Sequence[Tuple[Union[str, Combinable], str]]
+    index_type: str
+    condition: Optional[Q]
+    def __init__(
+        self,
+        *,
+        name: str,
+        expressions: Sequence[Tuple[Union[str, Combinable], str]],
+        condition: Optional[Q] = ...,
+        index_type: Optional[str] = ...,
+    ): ...

django-stubs/contrib/postgres/fields/__init__.pyi

@@ -8,6 +8,8 @@ from .ranges import (
     FloatRangeField as FloatRangeField,
     DateRangeField as DateRangeField,
     DateTimeRangeField as DateTimeRangeField,
+    RangeOperators as RangeOperators,
+    RangeBoundary as RangeBoundary,
 )
 from .hstore import HStoreField as HStoreField
 from .citext import (

django-stubs/contrib/postgres/fields/ranges.pyi

@@ -29,3 +29,20 @@ class DateTimeRangeField(RangeField):
 
 class DateRangeField(RangeField):
     def __get__(self, instance, owner) -> DateRange: ...
+
+class RangeOperators:
+    EQUAL: str
+    NOT_EQUAL: str
+    CONTAINS: str
+    CONTAINED_BY: str
+    OVERLAPS: str
+    FULLY_LT: str
+    FULLY_GT: str
+    NOT_LT: str
+    NOT_GT: str
+    ADJACENT_TO: str
+
+class RangeBoundary(models.Expression):
+    lower: str
+    upper: str
+    def __init__(self, inclusive_lower: bool = ..., inclusive_upper: bool = ...): ...

django-stubs/contrib/sites/management.pyi

@@ -1,10 +1,10 @@
 from typing import Any
 
+from django.apps.config import AppConfig
 from django.apps.registry import Apps
-from django.contrib.sites.apps import SitesConfig
 
 def create_default_site(
-    app_config: SitesConfig,
+    app_config: AppConfig,
     verbosity: int = ...,
     interactive: bool = ...,
     using: str = ...,

django-stubs/contrib/sites/models.pyi

@@ -6,15 +6,16 @@ from django.db import models
 
 SITE_CACHE: Any
 
-class SiteManager(models.Manager):
+class SiteManager(models.Manager["Site"]):
     def get_current(self, request: Optional[HttpRequest] = ...) -> Site: ...
     def clear_cache(self) -> None: ...
     def get_by_natural_key(self, domain: str) -> Site: ...
 
 class Site(models.Model):
-    domain: models.CharField = ...
+    objects: SiteManager
-    name: models.CharField = ...
+
-    objects: SiteManager = ...
+    domain = models.CharField(max_length=100)
+    name = models.CharField(max_length=50)
     def natural_key(self) -> Tuple[str]: ...
 
 def clear_site_cache(sender: Type[Site], **kwargs: Any) -> None: ...

django-stubs/contrib/staticfiles/checks.pyi

@@ -1,5 +1,7 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Error
 
-def check_finders(app_configs: None = ..., **kwargs: Any) -> List[Error]: ...
+from django.apps.config import AppConfig
+
+def check_finders(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[Error]: ...

django-stubs/contrib/staticfiles/finders.pyi

@@ -37,7 +37,7 @@ def get_finders() -> Iterator[BaseFinder]: ...
 def get_finder(import_path: Literal["django.contrib.staticfiles.finders.FileSystemFinder"]) -> FileSystemFinder: ...
 @overload
 def get_finder(
-    import_path: Literal["django.contrib.staticfiles.finders.AppDirectoriesFinder"]
+    import_path: Literal["django.contrib.staticfiles.finders.AppDirectoriesFinder"],
 ) -> AppDirectoriesFinder: ...
 @overload
 def get_finder(import_path: str) -> BaseFinder: ...

django-stubs/core/checks/caches.pyi

@@ -1,7 +1,9 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Error
 
+from django.apps.config import AppConfig
+
 E001: Any
 
-def check_default_cache_is_configured(app_configs: None, **kwargs: Any) -> List[Error]: ...
+def check_default_cache_is_configured(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Error]: ...

django-stubs/core/checks/model_checks.pyi

@@ -1,6 +1,8 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Warning
 
-def check_all_models(app_configs: None = ..., **kwargs: Any) -> List[Warning]: ...
+from django.apps.config import AppConfig
-def check_lazy_references(app_configs: None = ..., **kwargs: Any) -> List[Any]: ...
+
+def check_all_models(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[Warning]: ...
+def check_lazy_references(app_configs: Optional[Iterable[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...

django-stubs/core/checks/registry.pyi

@@ -12,6 +12,7 @@ class Tags:
     security: str = ...
     signals: str = ...
     templates: str = ...
+    translation: str = ...
     urls: str = ...
 
 class CheckRegistry:

django-stubs/core/checks/security/base.pyi

@@ -1,7 +1,9 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Warning
 
+from django.apps.config import AppConfig
+
 SECRET_KEY_MIN_LENGTH: int
 SECRET_KEY_MIN_UNIQUE_CHARACTERS: int
 W001: Any
@@ -17,15 +19,15 @@ W019: Any
 W020: Any
 W021: Any
 
-def check_security_middleware(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_security_middleware(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_xframe_options_middleware(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_xframe_options_middleware(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_sts(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_sts(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_sts_include_subdomains(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_sts_include_subdomains(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_sts_preload(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_sts_preload(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_content_type_nosniff(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_content_type_nosniff(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_xss_filter(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_xss_filter(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_ssl_redirect(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_ssl_redirect(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_secret_key(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_secret_key(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_debug(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_debug(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_xframe_deny(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_xframe_deny(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_allowed_hosts(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_allowed_hosts(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...

django-stubs/core/checks/security/csrf.pyi

@@ -1,9 +1,11 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Warning
 
+from django.apps.config import AppConfig
+
 W003: Any
 W016: Any
 
-def check_csrf_middleware(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_csrf_middleware(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_csrf_cookie_secure(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_csrf_cookie_secure(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...

django-stubs/core/checks/security/sessions.pyi

@@ -1,7 +1,9 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Warning
 
+from django.apps.config import AppConfig
+
 def add_session_cookie_message(message: Any): ...
 
 W010: Any
@@ -14,5 +16,5 @@ W013: Any
 W014: Any
 W015: Any
 
-def check_session_cookie_secure(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_session_cookie_secure(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
-def check_session_cookie_httponly(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_session_cookie_httponly(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...

django-stubs/core/checks/templates.pyi

@@ -1,9 +1,11 @@
-from typing import Any, List
+from typing import Any, List, Iterable, Optional
 
 from django.core.checks.messages import Error
 
+from django.apps.config import AppConfig
+
 E001: Any
 E002: Any
 
-def check_setting_app_dirs_loaders(app_configs: None, **kwargs: Any) -> List[Error]: ...
+def check_setting_app_dirs_loaders(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Error]: ...
-def check_string_if_invalid_is_string(app_configs: None, **kwargs: Any) -> List[Error]: ...
+def check_string_if_invalid_is_string(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Error]: ...

django-stubs/core/checks/urls.pyi

@@ -1,11 +1,13 @@
-from typing import Any, Callable, List, Tuple, Union
+from typing import Any, Callable, List, Tuple, Union, Iterable, Optional
 
 from django.core.checks.messages import CheckMessage, Error, Warning
 from django.urls.resolvers import URLPattern, URLResolver
 
-def check_url_config(app_configs: None, **kwargs: Any) -> List[CheckMessage]: ...
+from django.apps.config import AppConfig
+
+def check_url_config(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[CheckMessage]: ...
 def check_resolver(resolver: Union[Tuple[str, Callable], URLPattern, URLResolver]) -> List[CheckMessage]: ...
-def check_url_namespaces_unique(app_configs: None, **kwargs: Any) -> List[Warning]: ...
+def check_url_namespaces_unique(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Warning]: ...
 def get_warning_for_invalid_pattern(pattern: Any) -> List[Error]: ...
-def check_url_settings(app_configs: None, **kwargs: Any) -> List[Error]: ...
+def check_url_settings(app_configs: Optional[Iterable[AppConfig]], **kwargs: Any) -> List[Error]: ...
 def E006(name: str) -> Error: ...

django-stubs/core/mail/backends/base.pyi

@@ -1,5 +1,5 @@
 import types
-from typing import Any, TypeVar, Type, Iterable
+from typing import Any, TypeVar, Type, Iterable, Optional
 
 from django.core.mail.message import EmailMessage
 
@@ -7,7 +7,7 @@ _T = TypeVar("_T", bound="BaseEmailBackend")
 
 class BaseEmailBackend:
     def __init__(self, fail_silently: bool = ..., **kwargs: Any) -> None: ...
-    def open(self) -> bool: ...
+    def open(self) -> Optional[bool]: ...
     def close(self) -> None: ...
     def __enter__(self: _T) -> _T: ...
     def __exit__(

django-stubs/core/mail/backends/console.pyi

@@ -0,0 +1,3 @@
+from django.core.mail.backends.base import BaseEmailBackend
+
+class EmailBackend(BaseEmailBackend): ...

django-stubs/core/mail/backends/dummy.pyi

@@ -0,0 +1,3 @@
+from django.core.mail.backends.base import BaseEmailBackend
+
+class EmailBackend(BaseEmailBackend): ...

django-stubs/core/mail/backends/filebased.pyi

@@ -0,0 +1,3 @@
+from django.core.mail.backends.base import BaseEmailBackend
+
+class EmailBackend(BaseEmailBackend): ...

django-stubs/core/mail/backends/locmem.pyi

@@ -0,0 +1,3 @@
+from django.core.mail.backends.base import BaseEmailBackend
+
+class EmailBackend(BaseEmailBackend): ...

django-stubs/core/mail/backends/smtp.pyi

@@ -0,0 +1,18 @@
+import smtplib
+import threading
+from typing import Optional, Union
+
+from django.core.mail.backends.base import BaseEmailBackend
+
+class EmailBackend(BaseEmailBackend):
+    host: str = ...
+    port: int = ...
+    username: str = ...
+    password: str = ...
+    use_tls: bool = ...
+    use_ssl: bool = ...
+    timeout: Optional[int] = ...
+    ssl_keyfile: Optional[str] = ...
+    ssl_certfile: Optional[str] = ...
+    connection: Union[smtplib.SMTP_SSL, smtplib.SMTP, None] = ...
+    _lock: threading.RLock = ...

django-stubs/core/mail/message.pyi

@@ -1,8 +1,10 @@
 from email._policybase import Policy  # type: ignore
+from email.message import Message
+from email.mime.base import MIMEBase
 from email.mime.message import MIMEMessage
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
-from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
+from typing import Any, Dict, List, Optional, Sequence, Tuple, Union, overload
 
 utf8_charset: Any
 utf8_charset_qp: Any
@@ -43,6 +45,11 @@ class SafeMIMEMultipart(MIMEMixin, MIMEMultipart):
         self, _subtype: str = ..., boundary: None = ..., _subparts: None = ..., encoding: str = ..., **_params: Any
     ) -> None: ...
 
+_AttachmentContent = Union[bytes, EmailMessage, Message, SafeMIMEText, str]
+_AttachmentTuple = Union[
+    Tuple[str, _AttachmentContent], Tuple[Optional[str], _AttachmentContent, str], Tuple[str, _AttachmentContent, None]
+]
+
 class EmailMessage:
     content_subtype: str = ...
     mixed_subtype: str = ...
@@ -62,42 +69,42 @@ class EmailMessage:
         subject: str = ...,
         body: Optional[str] = ...,
         from_email: Optional[str] = ...,
-        to: Optional[Union[Sequence[str], str]] = ...,
+        to: Optional[Sequence[str]] = ...,
-        bcc: Optional[Union[Sequence[str], str]] = ...,
+        bcc: Optional[Sequence[str]] = ...,
         connection: Optional[Any] = ...,
-        attachments: Optional[Union[List[Tuple[str, Union[str, bytes], str]], List[MIMEText]]] = ...,
+        attachments: Optional[Sequence[Union[MIMEBase, _AttachmentTuple]]] = ...,
         headers: Optional[Dict[str, str]] = ...,
-        cc: Optional[Union[Sequence[str], str]] = ...,
+        cc: Optional[Sequence[str]] = ...,
-        reply_to: Optional[Union[List[Optional[str]], str]] = ...,
+        reply_to: Optional[Sequence[str]] = ...,
     ) -> None: ...
     def get_connection(self, fail_silently: bool = ...) -> Any: ...
     # TODO: when typeshed gets more types for email.Message, move it to MIMEMessage, now it has too many false-positives
     def message(self) -> Any: ...
     def recipients(self) -> List[str]: ...
     def send(self, fail_silently: bool = ...) -> int: ...
-    def attach(
+    @overload
-        self,
+    def attach(self, filename: MIMEText = ...) -> None: ...
-        filename: Optional[Union[MIMEText, str]] = ...,
+    @overload
-        content: Optional[Union[bytes, EmailMessage, SafeMIMEText, str]] = ...,
+    def attach(self, filename: None = ..., content: _AttachmentContent = ..., mimetype: str = ...) -> None: ...
-        mimetype: Optional[str] = ...,
+    @overload
-    ) -> None: ...
+    def attach(self, filename: str = ..., content: _AttachmentContent = ..., mimetype: Optional[str] = ...) -> None: ...
     def attach_file(self, path: str, mimetype: Optional[str] = ...) -> None: ...
 
 class EmailMultiAlternatives(EmailMessage):
     alternative_subtype: str = ...
-    alternatives: Any = ...
+    alternatives: Sequence[Tuple[_AttachmentContent, str]] = ...
     def __init__(
         self,
         subject: str = ...,
         body: str = ...,
         from_email: Optional[str] = ...,
-        to: Optional[List[str]] = ...,
+        to: Optional[Sequence[str]] = ...,
-        bcc: Optional[List[str]] = ...,
+        bcc: Optional[Sequence[str]] = ...,
         connection: Optional[Any] = ...,
-        attachments: None = ...,
+        attachments: Optional[Sequence[Union[MIMEBase, _AttachmentTuple]]] = ...,
         headers: Optional[Dict[str, str]] = ...,
-        alternatives: Optional[List[Tuple[str, str]]] = ...,
+        alternatives: Optional[Sequence[Tuple[_AttachmentContent, str]]] = ...,
-        cc: None = ...,
+        cc: Optional[Sequence[str]] = ...,
-        reply_to: None = ...,
+        reply_to: Optional[Sequence[str]] = ...,
     ) -> None: ...
-    def attach_alternative(self, content: str, mimetype: str) -> None: ...
+    def attach_alternative(self, content: _AttachmentContent, mimetype: str) -> None: ...

django-stubs/core/management/base.pyi

@@ -63,7 +63,7 @@ class BaseCommand:
         fail_level: int = ...,
     ) -> None: ...
     def check_migrations(self) -> None: ...
-    def handle(self, *args: Any, **options: Any) -> None: ...
+    def handle(self, *args: Any, **options: Any) -> Optional[str]: ...
 
 class AppCommand(BaseCommand):
     missing_args_message: str = ...

django-stubs/core/serializers/base.pyi

@@ -1,6 +1,6 @@
 from datetime import date
 from io import BufferedReader, StringIO, TextIOWrapper
-from typing import Any, Dict, Iterable, List, Mapping, Optional, Type, Union
+from typing import Any, Dict, Iterable, List, Mapping, Optional, Type, Union, Collection
 from uuid import UUID
 
 from django.core.management.base import OutputWrapper
@@ -35,18 +35,18 @@ class Serializer:
     internal_use_only: bool = ...
     progress_class: Any = ...
     stream_class: Any = ...
-    options: Any = ...
+    options: Dict[str, Any] = ...
     stream: Any = ...
-    selected_fields: Any = ...
+    selected_fields: Optional[Collection[str]] = ...
-    use_natural_foreign_keys: Any = ...
+    use_natural_foreign_keys: bool = ...
-    use_natural_primary_keys: Any = ...
+    use_natural_primary_keys: bool = ...
     first: bool = ...
     def serialize(
         self,
         queryset: Iterable[Model],
         *,
         stream: Optional[Any] = ...,
-        fields: Optional[Any] = ...,
+        fields: Optional[Collection[str]] = ...,
         use_natural_foreign_keys: bool = ...,
         use_natural_primary_keys: bool = ...,
         progress_output: Optional[Any] = ...,
@@ -63,7 +63,7 @@ class Serializer:
     def getvalue(self) -> Optional[Union[bytes, str]]: ...
 
 class Deserializer:
-    options: Any = ...
+    options: Dict[str, Any] = ...
     stream: Any = ...
     def __init__(self, stream_or_string: Union[BufferedReader, TextIOWrapper, str], **options: Any) -> None: ...
     def __iter__(self) -> Deserializer: ...

django-stubs/core/serializers/json.pyi

@@ -1,24 +1,10 @@
 import json
-from datetime import datetime
+from typing import Any, Dict
-from decimal import Decimal
-from io import TextIOWrapper
-from typing import Any, Union, Dict
-from uuid import UUID
 
 from django.core.serializers.python import Serializer as PythonSerializer
-from django.db.models.base import Model
 
 class Serializer(PythonSerializer):
     json_kwargs: Dict[str, Any]
-    options: Dict[str, None]
-    selected_fields: None
-    stream: TextIOWrapper
-    use_natural_foreign_keys: bool
-    use_natural_primary_keys: bool
-    internal_use_only: bool = ...
-    def start_serialization(self) -> None: ...
-    def end_serialization(self) -> None: ...
-    def end_object(self, obj: Model) -> None: ...
 
 def Deserializer(stream_or_string: Any, **options: Any) -> None: ...
 
@@ -29,4 +15,3 @@ class DjangoJSONEncoder(json.JSONEncoder):
     indent: int
     skipkeys: bool
     sort_keys: bool
-    def default(self, o: Union[datetime, Decimal, UUID]) -> str: ...

django-stubs/core/serializers/python.pyi

@@ -1,31 +1,15 @@
 from collections import OrderedDict
-from io import TextIOWrapper
+from typing import Any, Dict, Iterator, List, Optional
-from typing import Any, Dict, Iterator, List
 
 from django.core.serializers.base import DeserializedObject
 from django.db.models.base import Model
-from django.db.models.fields.related import ForeignKey, ManyToManyField
 
 from django.core.serializers import base
-from django.db.models.fields import Field
 
 class Serializer(base.Serializer):
-    options: Dict[Any, Any]
-    selected_fields: None
-    stream: TextIOWrapper
-    use_natural_foreign_keys: bool
-    use_natural_primary_keys: bool
-    internal_use_only: bool = ...
     objects: List[Any] = ...
-    def start_serialization(self) -> None: ...
-    def end_serialization(self) -> None: ...
-    def start_object(self, obj: Model) -> None: ...
-    def end_object(self, obj: Model) -> None: ...
     def get_dump_object(self, obj: Model) -> OrderedDict: ...
-    def handle_field(self, obj: Model, field: Field) -> None: ...
-    def handle_fk_field(self, obj: Model, field: ForeignKey) -> None: ...
-    def handle_m2m_field(self, obj: Model, field: ManyToManyField) -> None: ...
 
 def Deserializer(
-    object_list: List[Dict[str, Any]], *, using: Any = ..., ignorenonexistent: bool = ..., **options: Any
+    object_list: List[Dict[str, Any]], *, using: Optional[str] = ..., ignorenonexistent: bool = ..., **options: Any
 ) -> Iterator[DeserializedObject]: ...

django-stubs/core/validators.pyi

@@ -1,15 +1,13 @@
-from datetime import datetime
 from decimal import Decimal
 from re import RegexFlag
-from typing import Any, Dict, List, Optional, Union, Pattern, Collection
+from typing import Any, Dict, List, Optional, Union, Pattern, Collection, Callable, Tuple
-from uuid import UUID
 
 from django.core.files.base import File
-from django.core.exceptions import ValidationError as ValidationError  # noqa: F401
 
 EMPTY_VALUES: Any
 
 _Regex = Union[str, Pattern[str]]
+_ErrorMessage = Union[str, Any]
 
 def _lazy_re_compile(regex: _Regex, flags: int = ...): ...
 
@@ -22,7 +20,7 @@ class RegexValidator:
     def __init__(
         self,
         regex: Optional[_Regex] = ...,
-        message: Optional[str] = ...,
+        message: Optional[_ErrorMessage] = ...,
         code: Optional[str] = ...,
         inverse_match: Optional[bool] = ...,
         flags: Optional[RegexFlag] = ...,
@@ -45,67 +43,53 @@ integer_validator: Any
 def validate_integer(value: Optional[Union[float, str]]) -> None: ...
 
 class EmailValidator:
-    message: Any = ...
+    message: str = ...
     code: str = ...
     user_regex: Any = ...
     domain_regex: Any = ...
     literal_regex: Any = ...
     domain_whitelist: Any = ...
     def __init__(
-        self, message: Optional[str] = ..., code: Optional[str] = ..., whitelist: Optional[Collection[str]] = ...
+        self,
+        message: Optional[_ErrorMessage] = ...,
+        code: Optional[str] = ...,
+        whitelist: Optional[Collection[str]] = ...,
     ) -> None: ...
     def __call__(self, value: Optional[str]) -> None: ...
     def validate_domain_part(self, domain_part: str) -> bool: ...
 
-validate_email: Any
+validate_email: EmailValidator = ...
-slug_re: Any
+slug_re: Pattern = ...
-validate_slug: Any
+validate_slug: RegexValidator = ...
-slug_unicode_re: Any
+slug_unicode_re: Pattern = ...
-validate_unicode_slug: Any
+validate_unicode_slug: RegexValidator = ...
 
 def validate_ipv4_address(value: str) -> None: ...
 def validate_ipv6_address(value: str) -> None: ...
 def validate_ipv46_address(value: str) -> None: ...
 
-ip_address_validator_map: Any
+ip_address_validator_map: Dict[str, Tuple[Callable[[Any], None], str]]
 
 def ip_address_validators(protocol: str, unpack_ipv4: bool) -> Any: ...
 def int_list_validator(
-    sep: str = ..., message: None = ..., code: str = ..., allow_negative: bool = ...
+    sep: str = ..., message: Optional[_ErrorMessage] = ..., code: str = ..., allow_negative: bool = ...
 ) -> RegexValidator: ...
 
 validate_comma_separated_integer_list: Any
 
 class BaseValidator:
-    message: Any = ...
+    message: str = ...
     code: str = ...
     limit_value: Any = ...
-    def __init__(self, limit_value: Any, message: Optional[str] = ...) -> None: ...
+    def __init__(self, limit_value: Any, message: Optional[_ErrorMessage] = ...) -> None: ...
     def __call__(self, value: Any) -> None: ...
-    def compare(self, a: bool, b: bool) -> bool: ...
+    def compare(self, a: Any, b: Any) -> bool: ...
     def clean(self, x: Any) -> Any: ...
 
-class MaxValueValidator(BaseValidator):
+class MaxValueValidator(BaseValidator): ...
-    message: Any = ...
+class MinValueValidator(BaseValidator): ...
-    code: str = ...
+class MinLengthValidator(BaseValidator): ...
-    def compare(self, a: Union[datetime, Decimal, float], b: Union[datetime, Decimal, float]) -> bool: ...
+class MaxLengthValidator(BaseValidator): ...
-
-class MinValueValidator(BaseValidator):
-    message: Any = ...
-    code: str = ...
-    def compare(self, a: Union[datetime, Decimal, float], b: Union[datetime, Decimal, float]) -> bool: ...
-
-class MinLengthValidator(BaseValidator):
-    message: Any = ...
-    code: str = ...
-    def compare(self, a: int, b: int) -> bool: ...
-    def clean(self, x: str) -> int: ...
-
-class MaxLengthValidator(BaseValidator):
-    message: Any = ...
-    code: str = ...
-    def compare(self, a: int, b: int) -> bool: ...
-    def clean(self, x: Union[bytes, str]) -> int: ...
 
 class DecimalValidator:
     messages: Any = ...
@@ -115,13 +99,13 @@ class DecimalValidator:
     def __call__(self, value: Decimal) -> None: ...
 
 class FileExtensionValidator:
-    message: Any = ...
+    message: str = ...
     code: str = ...
     allowed_extensions: List[str] = ...
     def __init__(
         self,
         allowed_extensions: Optional[Collection[str]] = ...,
-        message: Optional[str] = ...,
+        message: Optional[_ErrorMessage] = ...,
         code: Optional[str] = ...,
     ) -> None: ...
     def __call__(self, value: File) -> None: ...
@@ -130,7 +114,7 @@ def get_available_image_extensions() -> List[str]: ...
 def validate_image_file_extension(value: File) -> None: ...
 
 class ProhibitNullCharactersValidator:
-    message: Any = ...
+    message: str = ...
     code: str = ...
-    def __init__(self, message: Optional[str] = ..., code: Optional[str] = ...) -> None: ...
+    def __init__(self, message: Optional[_ErrorMessage] = ..., code: Optional[str] = ...) -> None: ...
-    def __call__(self, value: Optional[Union[Dict[Any, Any], str, UUID]]) -> None: ...
+    def __call__(self, value: Any) -> None: ...

django-stubs/db/backends/base/base.pyi

@@ -20,7 +20,7 @@ class BaseDatabaseWrapper:
     ops: Any = ...
     vendor: str = ...
     display_name: str = ...
-    SchemaEditorClass: Any = ...
+    SchemaEditorClass: Optional[BaseDatabaseSchemaEditor] = ...
     client_class: Any = ...
     creation_class: Any = ...
     features_class: Any = ...

django-stubs/db/backends/base/introspection.pyi

@@ -1,5 +1,5 @@
 from collections import namedtuple
-from typing import Any, Dict, List, Optional, Set, Tuple, Type, Union
+from typing import Any, Dict, List, Optional, Set, Type
 
 from django.db.backends.base.base import BaseDatabaseWrapper
 from django.db.backends.utils import CursorWrapper
@@ -13,7 +13,7 @@ class BaseDatabaseIntrospection:
     data_types_reverse: Any = ...
     connection: Any = ...
     def __init__(self, connection: BaseDatabaseWrapper) -> None: ...
-    def get_field_type(self, data_type: str, description: FieldInfo) -> Union[Tuple[str, Dict[str, int]], str]: ...
+    def get_field_type(self, data_type: str, description: FieldInfo) -> str: ...
     def table_name_converter(self, name: str) -> str: ...
     def column_name_converter(self, name: str) -> str: ...
     def table_names(self, cursor: Optional[CursorWrapper] = ..., include_views: bool = ...) -> List[str]: ...

django-stubs/db/backends/base/operations.pyi

@@ -1,10 +1,9 @@
-from datetime import date, datetime, timedelta
+from datetime import date, datetime, timedelta, time
 from decimal import Decimal
 from typing import Any, List, Optional, Sequence, Tuple, Type, Union
 
 from django.core.management.color import Style
 from django.db.backends.base.base import BaseDatabaseWrapper
-from django.db.backends.sqlite3.base import DatabaseWrapper
 from django.db.backends.utils import CursorWrapper
 from django.db.models.base import Model
 from django.db.models.expressions import Case, Expression
@@ -13,6 +12,8 @@ from django.db.models.sql.compiler import SQLCompiler
 from django.db import DefaultConnectionProxy
 from django.db.models.fields import Field
 
+_Connection = Union[DefaultConnectionProxy, BaseDatabaseWrapper]
+
 class BaseDatabaseOperations:
     compiler_module: str = ...
     integer_field_ranges: Any = ...
@@ -25,8 +26,8 @@ class BaseDatabaseOperations:
     UNBOUNDED_FOLLOWING: Any = ...
     CURRENT_ROW: str = ...
     explain_prefix: Any = ...
-    connection: Any = ...
+    connection: _Connection = ...
-    def __init__(self, connection: Optional[Union[DefaultConnectionProxy, BaseDatabaseWrapper]]) -> None: ...
+    def __init__(self, connection: Optional[_Connection]) -> None: ...
     def autoinc_sql(self, table: str, column: str) -> None: ...
     def bulk_batch_size(self, fields: Any, objs: Any): ...
     def cache_key_culling_sql(self) -> str: ...
@@ -75,10 +76,10 @@ class BaseDatabaseOperations:
     def prep_for_like_query(self, x: str) -> str: ...
     prep_for_iexact_query: Any = ...
     def validate_autopk_value(self, value: int) -> int: ...
-    def adapt_unknown_value(self, value: Union[datetime, Decimal, int, str]) -> Union[int, str]: ...
+    def adapt_unknown_value(self, value: Any) -> Any: ...
     def adapt_datefield_value(self, value: Optional[date]) -> Optional[str]: ...
-    def adapt_datetimefield_value(self, value: None) -> None: ...
+    def adapt_datetimefield_value(self, value: Optional[datetime]) -> Optional[str]: ...
-    def adapt_timefield_value(self, value: Optional[datetime]) -> Optional[str]: ...
+    def adapt_timefield_value(self, value: Optional[Union[datetime, time]]) -> Optional[str]: ...
     def adapt_decimalfield_value(
         self, value: Optional[Decimal], max_digits: Optional[int] = ..., decimal_places: Optional[int] = ...
     ) -> Optional[str]: ...
@@ -87,19 +88,17 @@ class BaseDatabaseOperations:
     def year_lookup_bounds_for_datetime_field(self, value: int) -> List[str]: ...
     def get_db_converters(self, expression: Expression) -> List[Any]: ...
     def convert_durationfield_value(
-        self, value: Optional[float], expression: Expression, connection: DatabaseWrapper
+        self, value: Optional[float], expression: Expression, connection: _Connection
     ) -> Optional[timedelta]: ...
     def check_expression_support(self, expression: Any) -> None: ...
     def combine_expression(self, connector: str, sub_expressions: List[str]) -> str: ...
     def combine_duration_expression(self, connector: Any, sub_expressions: Any): ...
     def binary_placeholder_sql(self, value: Optional[Case]) -> str: ...
-    def modify_insert_params(
+    def modify_insert_params(self, placeholder: str, params: Any) -> Any: ...
-        self, placeholder: str, params: Union[List[None], List[bool], List[float], List[str]]
-    ) -> Union[List[None], List[bool], List[float], List[str]]: ...
     def integer_field_range(self, internal_type: Any): ...
     def subtract_temporals(self, internal_type: Any, lhs: Any, rhs: Any): ...
     def window_frame_start(self, start: Any): ...
     def window_frame_end(self, end: Any): ...
-    def window_frame_rows_start_end(self, start: None = ..., end: None = ...) -> Any: ...
+    def window_frame_rows_start_end(self, start: Optional[int] = ..., end: Optional[int] = ...) -> Any: ...
-    def window_frame_range_start_end(self, start: Optional[Any] = ..., end: Optional[Any] = ...): ...
+    def window_frame_range_start_end(self, start: Optional[int] = ..., end: Optional[int] = ...) -> Any: ...
     def explain_query_prefix(self, format: Optional[str] = ..., **options: Any) -> str: ...

django-stubs/db/backends/base/schema.pyi

@@ -48,7 +48,7 @@ class BaseDatabaseSchemaEditor(ContextManager[Any]):
     def quote_name(self, name: str) -> str: ...
     def column_sql(
         self, model: Type[Model], field: Field, include_default: bool = ...
-    ) -> Union[Tuple[None, None], Tuple[str, List[Any]]]: ...
+    ) -> Tuple[Optional[str], Optional[List[Any]]]: ...
     def skip_default(self, field: Any): ...
     def prepare_default(self, value: Any) -> None: ...
     def effective_default(self, field: Field) -> Optional[Union[int, str]]: ...

django-stubs/db/backends/sqlite3/base.pyi

@@ -10,3 +10,5 @@ class DatabaseWrapper(BaseDatabaseWrapper): ...
 FORMAT_QMARK_REGEX: Any
 
 class SQLiteCursorWrapper(Database.Cursor): ...
+
+def check_sqlite_version() -> None: ...

django-stubs/db/backends/sqlite3/introspection.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Dict, Optional, Tuple, Union
+from typing import Any, Optional
 
 from django.db.backends.base.introspection import BaseDatabaseIntrospection
 
@@ -8,6 +8,6 @@ def get_field_size(name: str) -> Optional[int]: ...
 
 class FlexibleFieldLookupDict:
     base_data_types_reverse: Any = ...
-    def __getitem__(self, key: str) -> Union[Tuple[str, Dict[str, int]], str]: ...
+    def __getitem__(self, key: str) -> Any: ...
 
 class DatabaseIntrospection(BaseDatabaseIntrospection): ...

django-stubs/db/migrations/state.pyi

@@ -1,21 +1,13 @@
-from typing import Any, DefaultDict, Dict, Iterator, List, Optional, Sequence, Tuple, Type, Union, Set
+from typing import Any, Dict, Iterator, List, Optional, Sequence, Tuple, Type, Union, Set
 
+from django.apps import AppConfig
 from django.apps.registry import Apps
 from django.db.models.base import Model
 from django.db.models.manager import Manager
 
 from django.db.models.fields import Field
 
-class AppConfigStub:
+class AppConfigStub(AppConfig): ...
-    apps: None
-    label: str
-    models: None
-    models_module: None
-    module: None
-    name: str
-    verbose_name: str
-    def __init__(self, label: str) -> None: ...
-    def import_models(self) -> None: ...
 
 class ModelState:
     name: str
@@ -66,13 +58,7 @@ class ProjectState:
     def remove_model(self, app_label: str, model_name: str) -> None: ...
 
 class StateApps(Apps):
-    all_models: DefaultDict
-    apps_ready: bool
-    loading: bool
-    models_ready: bool
-    ready: bool
     real_models: List[ModelState]
-    stored_app_configs: List[Any]
     def __init__(
         self, real_apps: List[str], models: Dict[Tuple[str, str], ModelState], ignore_swappable: bool = ...
     ) -> None: ...

django-stubs/db/models/__init__.pyi

@@ -40,6 +40,7 @@ from .fields import (
     DurationField as DurationField,
     BigAutoField as BigAutoField,
     CommaSeparatedIntegerField as CommaSeparatedIntegerField,
+    NOT_PROVIDED as NOT_PROVIDED,
 )
 
 from .fields.related import (
@@ -128,3 +129,5 @@ from .constraints import (
     CheckConstraint as CheckConstraint,
     UniqueConstraint as UniqueConstraint,
 )
+
+from .enums import Choices as Choices, IntegerChoices as IntegerChoices, TextChoices as TextChoices

django-stubs/db/models/base.pyi

@@ -1,6 +1,7 @@
-from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, TypeVar, Union
+from typing import Any, Callable, Dict, List, Optional, Sequence, Set, Tuple, Type, TypeVar, Union, Collection
 
 from django.core.checks.messages import CheckMessage
+from django.core.exceptions import ValidationError
 from django.db.models.manager import Manager
 from django.db.models.options import Options
 
@@ -18,10 +19,13 @@ class Model(metaclass=ModelBase):
     pk: Any = ...
     def __init__(self: _Self, *args, **kwargs) -> None: ...
     def delete(self, using: Any = ..., keep_parents: bool = ...) -> Tuple[int, Dict[str, int]]: ...
-    def full_clean(self, exclude: Optional[List[str]] = ..., validate_unique: bool = ...) -> None: ...
+    def full_clean(self, exclude: Optional[Collection[str]] = ..., validate_unique: bool = ...) -> None: ...
     def clean(self) -> None: ...
-    def clean_fields(self, exclude: List[str] = ...) -> None: ...
+    def clean_fields(self, exclude: Optional[Collection[str]] = ...) -> None: ...
-    def validate_unique(self, exclude: List[str] = ...) -> None: ...
+    def validate_unique(self, exclude: Optional[Collection[str]] = ...) -> None: ...
+    def unique_error_message(
+        self, model_class: Type[_Self], unique_check: Collection[Union[Callable, str]]
+    ) -> ValidationError: ...
     def save(
         self,
         force_insert: bool = ...,
@@ -37,7 +41,7 @@ class Model(metaclass=ModelBase):
         using: Optional[str] = ...,
         update_fields: Optional[Union[Sequence[str], str]] = ...,
     ): ...
-    def refresh_from_db(self: _Self, using: Optional[str] = ..., fields: Optional[List[str]] = ...) -> _Self: ...
+    def refresh_from_db(self: _Self, using: Optional[str] = ..., fields: Optional[List[str]] = ...) -> None: ...
     def get_deferred_fields(self) -> Set[str]: ...
     @classmethod
     def check(cls, **kwargs: Any) -> List[CheckMessage]: ...

django-stubs/db/models/deletion.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Callable, Iterable, Optional, Union
+from typing import Any, Callable, Iterable, Optional, Union, Collection, Type
 
 from django.db.models.base import Model
 
@@ -18,4 +18,11 @@ class ProtectedError(IntegrityError): ...
 
 class Collector:
     def __init__(self, using: str) -> None: ...
+    def collect(
+        self,
+        objs: Collection[Optional[Model]],
+        source: Optional[Type[Model]] = ...,
+        source_attr: Optional[str] = ...,
+        **kwargs: Any
+    ) -> None: ...
     def can_fast_delete(self, objs: Union[Model, Iterable[Model]], from_field: Optional[Field] = ...) -> bool: ...

django-stubs/db/models/enums.pyi

@@ -0,0 +1,30 @@
+import enum
+from typing import Any, List, Tuple
+
+class ChoicesMeta(enum.EnumMeta):
+    names: List[str] = ...
+    choices: List[Tuple[Any, str]] = ...
+    labels: List[str] = ...
+    values: List[Any] = ...
+    def __contains__(self, item: Any) -> bool: ...
+
+class Choices(enum.Enum, metaclass=ChoicesMeta):
+    def __str__(self): ...
+
+# fake
+class _IntegerChoicesMeta(ChoicesMeta):
+    names: List[str] = ...
+    choices: List[Tuple[int, str]] = ...
+    labels: List[str] = ...
+    values: List[int] = ...
+
+class IntegerChoices(int, Choices, metaclass=_IntegerChoicesMeta): ...
+
+# fake
+class _TextChoicesMeta(ChoicesMeta):
+    names: List[str] = ...
+    choices: List[Tuple[str, str]] = ...
+    labels: List[str] = ...
+    values: List[str] = ...
+
+class TextChoices(str, Choices, metaclass=_TextChoicesMeta): ...

django-stubs/db/models/fields/__init__.pyi

@@ -25,7 +25,9 @@ from django.db.models.expressions import Combinable, Col
 from django.db.models.query_utils import RegisterLookupMixin
 from django.forms import Field as FormField, Widget
 
-from .mixins import NOT_PROVIDED as NOT_PROVIDED
+class NOT_PROVIDED: ...
+
+BLANK_CHOICE_DASH: List[Tuple[str, str]] = ...
 
 _Choice = Tuple[Any, Any]
 _ChoiceNamedGroup = Tuple[str, Iterable[_Choice]]
@@ -52,6 +54,8 @@ class Field(RegisterLookupMixin, Generic[_ST, _GT]):
     auto_created: bool
     primary_key: bool
     remote_field: Field
+    is_relation: bool
+    related_model: Optional[Type[Model]]
     max_length: int
     model: Type[Model]
     name: str
@@ -61,9 +65,10 @@ class Field(RegisterLookupMixin, Generic[_ST, _GT]):
     null: bool = ...
     editable: bool = ...
     empty_strings_allowed: bool = ...
-    choices: Optional[_FieldChoices] = ...
+    choices: _FieldChoices = ...
     db_column: Optional[str]
     column: str
+    default: Any
     error_messages: _ErrorMessagesToOverride
     def __init__(
         self,
@@ -105,7 +110,8 @@ class Field(RegisterLookupMixin, Generic[_ST, _GT]):
     def db_parameters(self, connection: Any) -> Dict[str, str]: ...
     def get_prep_value(self, value: Any) -> Any: ...
     def get_internal_type(self) -> str: ...
-    def formfield(self, **kwargs) -> FormField: ...
+    # TODO: plugin support
+    def formfield(self, **kwargs) -> Any: ...
     def save_form_data(self, instance: Model, data: Any) -> None: ...
     def contribute_to_class(self, cls: Type[Model], name: str, private_only: bool = ...) -> None: ...
     def to_python(self, value: Any) -> Any: ...
@@ -128,11 +134,12 @@ class Field(RegisterLookupMixin, Generic[_ST, _GT]):
     @property
     def cached_col(self) -> Col: ...
     def value_from_object(self, obj: Model) -> _GT: ...
+    def get_attname(self) -> str: ...
 
 class IntegerField(Field[_ST, _GT]):
     _pyi_private_set_type: Union[float, int, str, Combinable]
     _pyi_private_get_type: int
-    _pyi_lookup_exact_type: int
+    _pyi_lookup_exact_type: Union[str, int]
 
 class PositiveIntegerRelDbTypeMixin:
     def rel_db_type(self, connection: Any): ...
@@ -180,7 +187,7 @@ class DecimalField(Field[_ST, _GT]):
 class AutoField(Field[_ST, _GT]):
     _pyi_private_set_type: Union[Combinable, int, str]
     _pyi_private_get_type: int
-    _pyi_lookup_exact_type: int
+    _pyi_lookup_exact_type: Union[str, int]
 
 class CharField(Field[_ST, _GT]):
     _pyi_private_set_type: Union[str, int, Combinable]
@@ -357,20 +364,20 @@ class UUIDField(Field[_ST, _GT]):
     _pyi_private_get_type: uuid.UUID
 
 class FilePathField(Field[_ST, _GT]):
-    path: str = ...
+    path: Any = ...
-    match: Optional[Any] = ...
+    match: Optional[str] = ...
     recursive: bool = ...
     allow_files: bool = ...
     allow_folders: bool = ...
     def __init__(
         self,
-        verbose_name: Optional[Union[str, bytes]] = ...,
+        path: Union[str, Callable[..., str]] = ...,
-        name: Optional[str] = ...,
+        match: Optional[str] = ...,
-        path: str = ...,
-        match: Optional[Any] = ...,
         recursive: bool = ...,
         allow_files: bool = ...,
         allow_folders: bool = ...,
+        verbose_name: Optional[str] = ...,
+        name: Optional[str] = ...,
         primary_key: bool = ...,
         max_length: int = ...,
         unique: bool = ...,
@@ -389,7 +396,8 @@ class FilePathField(Field[_ST, _GT]):
         error_messages: Optional[_ErrorMessagesToOverride] = ...,
     ): ...
 
-class BinaryField(Field[_ST, _GT]): ...
+class BinaryField(Field[_ST, _GT]):
+    _pyi_private_get_type: bytes
 
 class DurationField(Field[_ST, _GT]):
     _pyi_private_get_type: timedelta

django-stubs/db/models/fields/files.pyi

@@ -1,4 +1,5 @@
-from typing import Any, Callable, Iterable, List, Optional, Tuple, Type, TypeVar, Union, overload
+from pathlib import Path
+from typing import Any, Callable, Iterable, Optional, Type, TypeVar, Union, overload
 
 from django.core.files.base import File
 from django.core.files.images import ImageFile
@@ -7,8 +8,6 @@ from django.db.models.base import Model
 
 from django.db.models.fields import Field, _FieldChoices, _ValidatorCallable, _ErrorMessagesToOverride
 
-BLANK_CHOICE_DASH: List[Tuple[str, str]] = ...
-
 class FieldFile(File):
     instance: Model = ...
     field: FileField = ...
@@ -39,11 +38,10 @@ class FileField(Field):
     upload_to: Union[str, Callable] = ...
     def __init__(
         self,
+        upload_to: Union[str, Callable, Path] = ...,
+        storage: Optional[Storage] = ...,
         verbose_name: Optional[Union[str, bytes]] = ...,
         name: Optional[str] = ...,
-        upload_to: Union[str, Callable] = ...,
-        storage: Optional[Storage] = ...,
-        primary_key: bool = ...,
         max_length: Optional[int] = ...,
         unique: bool = ...,
         blank: bool = ...,

django-stubs/db/models/fields/related.pyi

@@ -43,9 +43,8 @@ class RelatedField(FieldCacheMixin, Field[_ST, _GT]):
     one_to_one: bool = ...
     many_to_many: bool = ...
     many_to_one: bool = ...
+    related_model: Type[Model]
     opts: Any = ...
-    @property
-    def related_model(self) -> Type[Model]: ...
     def get_forward_related_filter(self, obj: Model) -> Dict[str, Union[int, UUID]]: ...
     def get_reverse_related_filter(self, obj: Model) -> Q: ...
     @property

django-stubs/db/models/fields/reverse_related.pyi

@@ -18,6 +18,7 @@ class ForeignObjectRel(FieldCacheMixin):
     concrete: bool = ...
     editable: bool = ...
     is_relation: bool = ...
+    related_model: Type[Model]
     null: bool = ...
     field: RelatedField = ...
     model: Union[Type[Model], str] = ...
@@ -44,8 +45,6 @@ class ForeignObjectRel(FieldCacheMixin):
     @property
     def name(self) -> str: ...
     @property
-    def related_model(self) -> Type[Model]: ...
-    @property
     def remote_field(self) -> RelatedField: ...
     @property
     def target_field(self) -> AutoField: ...

django-stubs/db/models/functions/__init__.pyi

@@ -14,9 +14,14 @@ from .text import (
     Trim as Trim,
     Ord as Ord,
     Repeat as Repeat,
+    SHA1 as SHA1,
+    SHA224 as SHA224,
+    SHA256 as SHA256,
+    SHA384 as SHA384,
+    SHA512 as SHA512,
     StrIndex as StrIndex,
-    Replace as Replace,
     Substr as Substr,
+    Replace as Replace,
     Reverse as Reverse,
 )
 
@@ -81,6 +86,7 @@ from .math import (
     Power as Power,
     Radians as Radians,
     Round as Round,
+    Sign as Sign,
     Sin as Sin,
     Sqrt as Sqrt,
     Tan as Tan,

django-stubs/db/models/functions/math.pyi

@@ -23,3 +23,4 @@ class Round(Transform): ...
 class Sin(NumericOutputFieldMixin, Transform): ...
 class Sqrt(NumericOutputFieldMixin, Transform): ...
 class Tan(NumericOutputFieldMixin, Transform): ...
+class Sign(Transform): ...

django-stubs/db/models/functions/text.pyi

@@ -55,3 +55,11 @@ class Substr(Func):
 class Trim(Transform): ...
 class Upper(Transform): ...
 class Reverse(Transform): ...
+class MySQLSHA2Mixin: ...
+class OracleHashMixin: ...
+class PostgreSQLSHAMixin: ...
+class SHA1(OracleHashMixin, PostgreSQLSHAMixin, Transform): ...
+class SHA224(MySQLSHA2Mixin, PostgreSQLSHAMixin, Transform): ...
+class SHA256(MySQLSHA2Mixin, OracleHashMixin, PostgreSQLSHAMixin, Transform): ...
+class SHA384(MySQLSHA2Mixin, OracleHashMixin, PostgreSQLSHAMixin, Transform): ...
+class SHA512(MySQLSHA2Mixin, OracleHashMixin, PostgreSQLSHAMixin, Transform): ...

django-stubs/db/models/lookups.pyi

@@ -31,11 +31,9 @@ class Lookup(Generic[_T]):
     def process_lhs(
         self, compiler: SQLCompiler, connection: DatabaseWrapper, lhs: Optional[Expression] = ...
     ) -> Tuple[str, List[Union[int, str]]]: ...
-    def process_rhs(
+    def process_rhs(self, compiler: SQLCompiler, connection: DatabaseWrapper) -> Tuple[str, List[Union[int, str]]]: ...
-        self, compiler: SQLCompiler, connection: DatabaseWrapper
-    ) -> Tuple[str, Union[List[Union[int, str]], Tuple[int, int]]]: ...
     def rhs_is_direct_value(self) -> bool: ...
-    def relabeled_clone(self, relabels: Mapping[str, str]) -> Union[BuiltinLookup, FieldGetDbPrepValueMixin]: ...
+    def relabeled_clone(self: _T, relabels: Mapping[str, str]) -> _T: ...
     def get_group_by_cols(self) -> List[Expression]: ...
     def as_sql(self, compiler: Any, connection: Any) -> Any: ...
     def contains_aggregate(self) -> bool: ...

django-stubs/db/models/manager.pyi

@@ -1,16 +1,17 @@
-from typing import Any, Dict, List, Optional, Tuple, Type, TypeVar
+from typing import Any, Dict, List, Optional, Tuple, Type, TypeVar, Iterable, Union
 
 from django.db.models.base import Model
 from django.db.models.query import QuerySet
 
 _T = TypeVar("_T", bound=Model, covariant=True)
+_M = TypeVar("_M", bound="BaseManager")
 
 class BaseManager(QuerySet[_T]):
     creation_counter: int = ...
     auto_created: bool = ...
     use_in_migrations: bool = ...
     name: str = ...
-    model: Type[Model] = ...
+    model: Type[_T] = ...
     db: str
     def __init__(self) -> None: ...
     def deconstruct(self) -> Tuple[bool, str, None, Tuple, Dict[str, int]]: ...
@@ -20,13 +21,18 @@ class BaseManager(QuerySet[_T]):
     @classmethod
     def _get_queryset_methods(cls, queryset_class: type) -> Dict[str, Any]: ...
     def contribute_to_class(self, model: Type[Model], name: str) -> None: ...
-    def db_manager(self, using: Optional[str] = ..., hints: Optional[Dict[str, Model]] = ...) -> Manager: ...
+    def db_manager(self: _M, using: Optional[str] = ..., hints: Optional[Dict[str, Model]] = ...) -> _M: ...
     def get_queryset(self) -> QuerySet[_T]: ...
 
 class Manager(BaseManager[_T]): ...
 
 class RelatedManager(Manager[_T]):
-    def add(self, *objs: Model, bulk: bool = ...) -> None: ...
+    related_val: Tuple[int, ...]
+    def add(self, *objs: Union[_T, int], bulk: bool = ...) -> None: ...
+    def remove(self, *objs: Union[_T, int], bulk: bool = ...) -> None: ...
+    def set(
+        self, objs: Union[QuerySet[_T], Iterable[Union[_T, int]]], *, bulk: bool = ..., clear: bool = ...
+    ) -> None: ...
     def clear(self) -> None: ...
 
 class ManagerDescriptor:

django-stubs/db/models/options.pyi

@@ -1,5 +1,5 @@
 import collections
-from typing import Any, Callable, Dict, Generic, Iterator, List, Optional, Sequence, Set, Tuple, Type, TypeVar, Union
+from typing import Any, Callable, Dict, Generic, Iterator, List, Optional, Sequence, Tuple, Type, TypeVar, Union
 
 from django.apps.config import AppConfig
 from django.apps.registry import Apps
@@ -8,6 +8,7 @@ from django.contrib.postgres.fields.array import ArrayField
 from django.contrib.postgres.fields.citext import CIText
 from django.db.backends.sqlite3.base import DatabaseWrapper
 from django.db.models.base import Model
+from django.db.models.constraints import BaseConstraint
 from django.db.models.fields.mixins import FieldCacheMixin
 from django.db.models.fields.related import ManyToManyField, OneToOneField
 from django.db.models.fields.reverse_related import ForeignObjectRel
@@ -23,8 +24,8 @@ IMMUTABLE_WARNING: str
 DEFAULT_NAMES: Tuple[str, ...]
 
 def normalize_together(
-    option_together: Any
+    option_together: Union[Sequence[Tuple[str, str]], Tuple[str, str]]
-) -> Union[List[Union[Tuple[str, str], int]], Set[Tuple[str, str]], Tuple, int, str]: ...
+) -> Tuple[Tuple[str, str], ...]: ...
 def make_immutable_fields_list(
     name: str, data: Union[Iterator[Any], List[Union[ArrayField, CIText]], List[Union[Field, FieldCacheMixin]]]
 ) -> ImmutableList: ...
@@ -34,6 +35,7 @@ _M = TypeVar("_M", bound=Model)
 class Options(Generic[_M]):
     base_manager: Manager
     concrete_fields: ImmutableList
+    constraints: List[BaseConstraint]
     default_manager: Manager
     fields: ImmutableList
     local_concrete_fields: ImmutableList
@@ -108,6 +110,8 @@ class Options(Generic[_M]):
     def managers(self) -> List[Manager]: ...
     @property
     def managers_map(self) -> Dict[str, Manager]: ...
+    @property
+    def db_returning_fields(self) -> List[Field]: ...
     def get_field(self, field_name: Union[Callable, str]) -> Field: ...
     def get_base_chain(self, model: Type[Model]) -> List[Type[Model]]: ...
     def get_parent_list(self) -> List[Type[Model]]: ...

django-stubs/db/models/query.pyi

@@ -16,6 +16,7 @@ from typing import (
     TypeVar,
     Union,
     overload,
+    Reversible,
 )
 
 from django.db.models.base import Model
@@ -52,8 +53,9 @@ class _BaseQuerySet(Generic[_T], Sized):
     def get(self, *args: Any, **kwargs: Any) -> _T: ...
     def create(self, *args: Any, **kwargs: Any) -> _T: ...
     def bulk_create(
-        self, objs: Iterable[Model], batch_size: Optional[int] = ..., ignore_conflicts: bool = ...
+        self, objs: Iterable[_T], batch_size: Optional[int] = ..., ignore_conflicts: bool = ...
     ) -> List[_T]: ...
+    def bulk_update(self, objs: Iterable[_T], fields: Sequence[str], batch_size: Optional[int] = ...) -> None: ...
     def get_or_create(self, defaults: Optional[MutableMapping[str, Any]] = ..., **kwargs: Any) -> Tuple[_T, bool]: ...
     def update_or_create(
         self, defaults: Optional[MutableMapping[str, Any]] = ..., **kwargs: Any
@@ -119,16 +121,15 @@ class _BaseQuerySet(Generic[_T], Sized):
     @property
     def db(self) -> str: ...
     def resolve_expression(self, *args: Any, **kwargs: Any) -> Any: ...
-    # TODO: remove when django adds __class_getitem__ methods
-    def __getattr__(self, item: str) -> Any: ...
 
-class QuerySet(_BaseQuerySet[_T], Collection[_T], Sized):
+class QuerySet(_BaseQuerySet[_T], Collection[_T], Reversible[_T], Sized):
     def __iter__(self) -> Iterator[_T]: ...
     def __contains__(self, x: object) -> bool: ...
     @overload
     def __getitem__(self, i: int) -> _T: ...
     @overload
     def __getitem__(self: _QS, s: slice) -> _QS: ...
+    def __reversed__(self) -> Iterator[_T]: ...
 
 _Row = TypeVar("_Row", covariant=True)
 

django-stubs/db/models/query_utils.pyi

@@ -1,13 +1,13 @@
-from collections import OrderedDict, namedtuple
+from collections import namedtuple
-from typing import Any, Dict, Iterator, List, Optional, Set, Tuple, Type, Union
+from typing import Any, Collection, Dict, Iterator, List, Mapping, Optional, Sequence, Set, Tuple, Type
 
 from django.db.models.base import Model
-from django.db.models.expressions import Expression
-from django.db.models.fields import Field
 from django.db.models.fields.mixins import FieldCacheMixin
 from django.db.models.sql.compiler import SQLCompiler
 from django.db.models.sql.query import Query
 from django.db.models.sql.where import WhereNode
+
+from django.db.models.fields import Field
 from django.utils import tree
 
 PathInfo = namedtuple("PathInfo", "from_opts to_opts target_fields join_field m2m direct filtered_relation")
@@ -23,12 +23,8 @@ class QueryWrapper:
     def as_sql(self, compiler: SQLCompiler = ..., connection: Any = ...) -> Any: ...
 
 class Q(tree.Node):
-    children: Union[List[Dict[str, str]], List[Tuple[str, Any]], List[Q]]
-    connector: str
-    negated: bool
     AND: str = ...
     OR: str = ...
-    default: Any = ...
     conditional: bool = ...
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
     def __or__(self, other: Any) -> Q: ...
@@ -46,8 +42,8 @@ class Q(tree.Node):
 
 class DeferredAttribute:
     field_name: str = ...
+    field: Field
     def __init__(self, field_name: str) -> None: ...
-    def __get__(self, instance: Optional[Model], cls: Type[Model] = ...) -> Any: ...
 
 class RegisterLookupMixin:
     lookup_name: str
@@ -65,15 +61,11 @@ class RegisterLookupMixin:
 def select_related_descend(
     field: Field,
     restricted: bool,
-    requested: Optional[
+    requested: Optional[Mapping[str, Any]],
-        Union[Dict[str, Dict[str, Dict[str, Dict[str, Dict[str, Dict[str, Dict[str, Dict[Any, Any]]]]]]]], bool]
+    load_fields: Optional[Collection[str]],
-    ],
-    load_fields: Optional[Set[str]],
     reverse: bool = ...,
 ) -> bool: ...
-def refs_expression(
+def refs_expression(lookup_parts: Sequence[str], annotations: Mapping[str, bool]) -> Tuple[bool, Sequence[str]]: ...
-    lookup_parts: List[str], annotations: OrderedDict
-) -> Union[Tuple[bool, Tuple], Tuple[Expression, List[str]]]: ...
 def check_rel_lookup_compatibility(model: Type[Model], target_opts: Any, field: FieldCacheMixin) -> bool: ...
 
 class FilteredRelation:

django-stubs/db/models/sql/compiler.pyi

@@ -25,7 +25,7 @@ class SQLCompiler:
     def setup_query(self) -> None: ...
     has_extra_select: Any = ...
     def pre_sql_setup(
-        self
+        self,
     ) -> Tuple[
         List[Tuple[Expression, Tuple[str, Union[List[Any], Tuple[str, str]]], None]],
         List[Tuple[Expression, Tuple[str, List[Union[int, str]], bool]]],
@@ -40,7 +40,7 @@ class SQLCompiler:
         self, expressions: List[Expression], having: Union[List[Expression], Tuple]
     ) -> List[Expression]: ...
     def get_select(
-        self
+        self,
     ) -> Tuple[
         List[Tuple[Expression, Tuple[str, List[Union[int, str]]], Optional[str]]],
         Optional[Dict[str, Any]],

django-stubs/db/models/sql/query.pyi

@@ -1,6 +1,6 @@
 import collections
 from collections import OrderedDict, namedtuple
-from typing import Any, Callable, Dict, Iterator, List, Optional, Sequence, Set, Tuple, Type, Union
+from typing import Any, Callable, Dict, Iterator, List, Optional, Sequence, Set, Tuple, Type, Union, Iterable
 
 from django.db.models.lookups import Lookup, Transform
 from django.db.models.query_utils import PathInfo, RegisterLookupMixin
@@ -155,19 +155,19 @@ class Query:
     def add_ordering(self, *ordering: Any) -> None: ...
     def clear_ordering(self, force_empty: bool) -> None: ...
     def set_group_by(self) -> None: ...
-    def add_select_related(self, fields: Tuple[str]) -> None: ...
+    def add_select_related(self, fields: Iterable[str]) -> None: ...
     def add_extra(
         self,
-        select: Optional[Union[Dict[str, int], Dict[str, str], OrderedDict]],
+        select: Optional[Dict[str, Any]],
-        select_params: Optional[Union[List[int], List[str], Tuple[int]]],
+        select_params: Optional[Iterable[Any]],
-        where: Optional[List[str]],
+        where: Optional[Sequence[str]],
-        params: Optional[List[str]],
+        params: Optional[Sequence[str]],
-        tables: Optional[List[str]],
+        tables: Optional[Sequence[str]],
-        order_by: Optional[Union[List[str], Tuple[str]]],
+        order_by: Optional[Sequence[str]],
     ) -> None: ...
     def clear_deferred_loading(self) -> None: ...
-    def add_deferred_loading(self, field_names: Tuple[str]) -> None: ...
+    def add_deferred_loading(self, field_names: Iterable[str]) -> None: ...
-    def add_immediate_loading(self, field_names: Tuple[str]) -> None: ...
+    def add_immediate_loading(self, field_names: Iterable[str]) -> None: ...
     def get_loaded_field_names(self) -> Dict[Type[Model], Set[str]]: ...
     def get_loaded_field_names_cb(
         self, target: Dict[Type[Model], Set[str]], model: Type[Model], fields: Set[Field]

django-stubs/forms/__init__.pyi

@@ -2,6 +2,8 @@ from django.core.exceptions import ValidationError as ValidationError
 
 from .forms import Form as Form, BaseForm as BaseForm
 
+from .formsets import BaseFormSet as BaseFormSet, all_valid as all_valid, formset_factory as formset_factory
+
 from .models import (
     ModelForm as ModelForm,
     ModelChoiceField as ModelChoiceField,

django-stubs/forms/forms.pyi

@@ -68,4 +68,6 @@ class BaseForm:
     def visible_fields(self): ...
     def get_initial_for_field(self, field: Field, field_name: str) -> Any: ...
 
-class Form(BaseForm): ...
+class Form(BaseForm):
+    base_fields: Dict[str, Field]
+    declared_fields: Dict[str, Field]

django-stubs/http/request.pyi

@@ -18,6 +18,7 @@ from typing import (
 
 from django.contrib.auth.base_user import AbstractBaseUser
 from django.contrib.sessions.backends.base import SessionBase
+from django.contrib.sites.models import Site
 from django.utils.datastructures import CaseInsensitiveMapping, ImmutableList, MultiValueDict
 
 from django.core.files import uploadedfile, uploadhandler
@@ -51,6 +52,7 @@ class HttpRequest(BytesIO):
     content_type: Optional[str] = ...
     content_params: Optional[Dict[str, str]] = ...
     user: AbstractBaseUser
+    site: Site
     session: SessionBase
     encoding: Optional[str] = ...
     upload_handlers: UploadHandlerList = ...
@@ -63,7 +65,7 @@ class HttpRequest(BytesIO):
         self, key: str, default: Any = ..., salt: str = ..., max_age: Optional[int] = ...
     ) -> Optional[str]: ...
     def get_raw_uri(self) -> str: ...
-    def build_absolute_uri(self, location: str = ...) -> str: ...
+    def build_absolute_uri(self, location: Optional[str] = ...) -> str: ...
     @property
     def scheme(self) -> Optional[str]: ...
     def is_secure(self) -> bool: ...

django-stubs/http/response.pyi

@@ -63,7 +63,8 @@ class HttpResponseBase(Iterable[Any]):
 
 class HttpResponse(HttpResponseBase):
     client: Client
-    context: Optional[Context]
+    context: Context
+    content: Any
     csrf_cookie_set: bool
     redirect_chain: List[Tuple[str, int]]
     request: Dict[str, Any]
@@ -78,10 +79,6 @@ class HttpResponse(HttpResponseBase):
     def __init__(self, content: object = ..., *args: Any, **kwargs: Any) -> None: ...
     def serialize(self) -> bytes: ...
     @property
-    def content(self) -> Any: ...
-    @content.setter
-    def content(self, value: Any) -> None: ...
-    @property
     def url(self) -> str: ...
     def json(self) -> Dict[str, Any]: ...
 
@@ -107,7 +104,7 @@ class FileResponse(StreamingHttpResponse):
     def json(self) -> Dict[str, Any]: ...
 
 class HttpResponseRedirectBase(HttpResponse):
-    allowed_schemes = ...  # type: List[str]
+    allowed_schemes: List[str] = ...
     def __init__(self, redirect_to: str, *args: Any, **kwargs: Any) -> None: ...
 
 class HttpResponseRedirect(HttpResponseRedirectBase): ...

django-stubs/shortcuts.pyi

@@ -1,7 +1,11 @@
 from typing import Any, Callable, Dict, List, Optional, Protocol, Sequence, Type, TypeVar, Union
 
 from django.db.models.base import Model
-from django.http.response import HttpResponse as HttpResponse, HttpResponseRedirect as HttpResponseRedirect
+from django.http.response import (
+    HttpResponse as HttpResponse,
+    HttpResponseRedirect as HttpResponseRedirect,
+    HttpResponsePermanentRedirect as HttpResponsePermanentRedirect,
+)
 
 from django.db.models import Manager, QuerySet
 from django.http import HttpRequest
@@ -26,7 +30,7 @@ class SupportsGetAbsoluteUrl(Protocol): ...
 
 def redirect(
     to: Union[Callable, str, SupportsGetAbsoluteUrl], *args: Any, permanent: bool = ..., **kwargs: Any
-) -> HttpResponseRedirect: ...
+) -> Union[HttpResponseRedirect, HttpResponsePermanentRedirect]: ...
 
 _T = TypeVar("_T", bound=Model)
 

django-stubs/test/client.pyi

@@ -1,7 +1,7 @@
 from io import BytesIO
 from typing import Any, Dict, List, Optional, Pattern, Tuple, Type, Union
 
-from django.contrib.auth.models import User
+from django.contrib.auth.models import AbstractUser
 from django.contrib.sessions.backends.base import SessionBase
 from django.core.handlers.base import BaseHandler
 from django.core.serializers.json import DjangoJSONEncoder
@@ -9,6 +9,8 @@ from django.http.cookie import SimpleCookie
 from django.http.request import HttpRequest
 from django.http.response import HttpResponse, HttpResponseBase
 
+from django.core.handlers.wsgi import WSGIRequest
+
 BOUNDARY: str = ...
 MULTIPART_CONTENT: str = ...
 CONTENT_TYPE_RE: Pattern = ...
@@ -40,13 +42,13 @@ class RequestFactory:
     cookies: SimpleCookie = ...
     errors: BytesIO = ...
     def __init__(self, *, json_encoder: Any = ..., **defaults: Any) -> None: ...
-    def request(self, **request: Any) -> HttpRequest: ...
+    def request(self, **request: Any) -> WSGIRequest: ...
-    def get(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> HttpRequest: ...
+    def get(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> WSGIRequest: ...
     def post(
         self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
-    ) -> HttpRequest: ...
+    ) -> WSGIRequest: ...
-    def head(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> HttpRequest: ...
+    def head(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> WSGIRequest: ...
-    def trace(self, path: str, secure: bool = ..., **extra: Any) -> HttpRequest: ...
+    def trace(self, path: str, secure: bool = ..., **extra: Any) -> WSGIRequest: ...
     def options(
         self,
         path: str,
@@ -54,16 +56,16 @@ class RequestFactory:
         content_type: str = ...,
         secure: bool = ...,
         **extra: Any
-    ) -> HttpRequest: ...
+    ) -> WSGIRequest: ...
     def put(
         self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
-    ) -> HttpRequest: ...
+    ) -> WSGIRequest: ...
     def patch(
         self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
-    ) -> HttpRequest: ...
+    ) -> WSGIRequest: ...
     def delete(
         self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
-    ) -> HttpRequest: ...
+    ) -> WSGIRequest: ...
     def generic(
         self,
         method: str,
@@ -72,7 +74,7 @@ class RequestFactory:
         content_type: Optional[str] = ...,
         secure: bool = ...,
         **extra: Any
-    ) -> HttpRequest: ...
+    ) -> WSGIRequest: ...
 
 class Client:
     json_encoder: Type[DjangoJSONEncoder] = ...
@@ -82,13 +84,11 @@ class Client:
     handler: ClientHandler = ...
     exc_info: None = ...
     def __init__(self, enforce_csrf_checks: bool = ..., **defaults: Any) -> None: ...
-    def request(self, **request: Any) -> HttpResponse: ...
+    def request(self, **request: Any) -> Any: ...
-    def get(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> HttpResponse: ...
+    def get(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> Any: ...
-    def post(
+    def post(self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any) -> Any: ...
-        self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
+    def head(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> Any: ...
-    ) -> HttpResponse: ...
+    def trace(self, path: str, secure: bool = ..., **extra: Any) -> Any: ...
-    def head(self, path: str, data: Any = ..., secure: bool = ..., **extra: Any) -> HttpResponse: ...
-    def trace(self, path: str, secure: bool = ..., **extra: Any) -> HttpResponse: ...
     def options(
         self,
         path: str,
@@ -96,16 +96,10 @@ class Client:
         content_type: str = ...,
         secure: bool = ...,
         **extra: Any
-    ) -> HttpResponse: ...
+    ) -> Any: ...
-    def put(
+    def put(self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any) -> Any: ...
-        self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
+    def patch(self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any) -> Any: ...
-    ) -> HttpResponse: ...
+    def delete(self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any) -> Any: ...
-    def patch(
-        self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
-    ) -> HttpResponse: ...
-    def delete(
-        self, path: str, data: Any = ..., content_type: str = ..., secure: bool = ..., **extra: Any
-    ) -> HttpResponse: ...
     def generic(
         self,
         method: str,
@@ -114,12 +108,12 @@ class Client:
         content_type: Optional[str] = ...,
         secure: bool = ...,
         **extra: Any
-    ) -> HttpResponse: ...
+    ) -> Any: ...
     def store_exc_info(self, **kwargs: Any) -> None: ...
     @property
     def session(self) -> SessionBase: ...
     def login(self, **credentials: Any) -> bool: ...
-    def force_login(self, user: User, backend: Optional[str] = ...) -> None: ...
+    def force_login(self, user: AbstractUser, backend: Optional[str] = ...) -> None: ...
     def logout(self) -> None: ...
 
 def conditional_content_removal(request: HttpRequest, response: HttpResponseBase) -> HttpResponse: ...

django-stubs/test/testcases.pyi

@@ -1,7 +1,7 @@
 import threading
 import unittest
 from datetime import date
-from typing import Any, Callable, Dict, Iterator, List, Optional, Set, Tuple, Type, Union
+from typing import Any, Callable, Dict, Iterator, List, Optional, Set, Tuple, Type, Union, ClassVar, overload
 
 from django.core.exceptions import ImproperlyConfigured
 from django.core.handlers.wsgi import WSGIHandler
@@ -47,7 +47,8 @@ class SimpleTestCase(unittest.TestCase):
     client_class: Any = ...
     client: Client
     allow_database_queries: bool = ...
-    databases: Set[str] = ...
+    # TODO: str -> Literal['__all__']
+    databases: Union[Set[str], str] = ...
     def __call__(self, result: Optional[unittest.TestResult] = ...) -> None: ...
     def settings(self, **kwargs: Any) -> Any: ...
     def modify_settings(self, **kwargs: Any) -> Any: ...
@@ -145,9 +146,14 @@ class TransactionTestCase(SimpleTestCase):
         ordered: bool = ...,
         msg: Optional[str] = ...,
     ) -> None: ...
+    @overload
     def assertNumQueries(
-        self, num: int, func: Optional[Union[Callable, Type[list]]] = ..., *args: Any, using: Any = ..., **kwargs: Any
+        self, num: int, func: Callable[..., Any], *args: Any, using: str = ..., **kwargs: Any
-    ) -> Optional[_AssertNumQueriesContext]: ...
+    ) -> None: ...
+    @overload
+    def assertNumQueries(
+        self, num: int, func: None = ..., *args: Any, using: str = ..., **kwargs: Any
+    ) -> _AssertNumQueriesContext: ...
 
 class TestCase(TransactionTestCase):
     @classmethod
@@ -198,13 +204,12 @@ class LiveServerThread(threading.Thread):
     def terminate(self) -> None: ...
 
 class LiveServerTestCase(TransactionTestCase):
+    live_server_url: ClassVar[str]
     host: str = ...
     port: int = ...
     server_thread_class: Type[Any] = ...
     server_thread: Any
     static_handler: Any = ...
-    @classmethod
-    def live_server_url(cls): ...
 
 class SerializeMixin:
     lockfile: Any = ...

django-stubs/test/utils.pyi

@@ -1,9 +1,22 @@
 import decimal
-import warnings
 from contextlib import contextmanager
 from decimal import Decimal
 from io import StringIO
-from typing import Any, Callable, Dict, Iterable, Iterator, List, Mapping, Optional, Set, Tuple, Type, Union
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    Iterable,
+    Iterator,
+    List,
+    Mapping,
+    Optional,
+    Set,
+    Tuple,
+    Type,
+    Union,
+    ContextManager,
+)
 
 from django.apps.registry import Apps
 from django.core.checks.registry import CheckRegistry
@@ -86,7 +99,7 @@ class ignore_warnings(TestContextDecorator):
     ignore_kwargs: Dict[str, Any] = ...
     filter_func: Callable = ...
     def __init__(self, **kwargs: Any) -> None: ...
-    catch_warnings: warnings.catch_warnings = ...
+    catch_warnings: ContextManager[Optional[list]] = ...
 
 requires_tz_support: Any
 

django-stubs/utils/_os.pyi

@@ -1,4 +1,5 @@
 from os.path import abspath
+from pathlib import Path
 from typing import Any, Union
 
 abspathu = abspath
@@ -7,3 +8,4 @@ def upath(path: Any): ...
 def npath(path: Any): ...
 def safe_join(base: Union[bytes, str], *paths: Any) -> str: ...
 def symlinks_supported() -> Any: ...
+def to_path(value: Union[Path, str]) -> Path: ...

django-stubs/utils/deprecation.pyi

@@ -5,6 +5,7 @@ from django.http.response import HttpResponse
 
 class RemovedInDjango30Warning(PendingDeprecationWarning): ...
 class RemovedInDjango31Warning(PendingDeprecationWarning): ...
+class RemovedInDjango40Warning(PendingDeprecationWarning): ...
 class RemovedInNextVersionWarning(DeprecationWarning): ...
 
 class warn_about_renamed_method:

django-stubs/utils/encoding.pyi

@@ -1,25 +1,59 @@
-from typing import Any, Optional
+import datetime
+from decimal import Decimal
+from typing import Any, TypeVar, overload, Union
+
+from django.utils.functional import Promise
+from typing_extensions import Literal
 
 class DjangoUnicodeDecodeError(UnicodeDecodeError):
     obj: bytes = ...
     def __init__(self, obj: bytes, *args: Any) -> None: ...
 
-python_2_unicode_compatible: Any
+_P = TypeVar("_P", bound=Promise)
-
+_S = TypeVar("_S", bound=str)
+_PT = TypeVar("_PT", None, int, float, Decimal, datetime.datetime, datetime.date, datetime.time)
+@overload
+def smart_text(s: _P, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> _P: ...
+@overload
+def smart_text(s: _PT, encoding: str = ..., strings_only: Literal[True] = ..., errors: str = ...) -> _PT: ...
+@overload
+def smart_text(s: _S, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> _S: ...
+@overload
 def smart_text(s: Any, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> str: ...
 def is_protected_type(obj: Any) -> bool: ...
-def force_text(s: Any, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> Optional[str]: ...
+@overload
+def force_text(s: _PT, encoding: str = ..., strings_only: Literal[True] = ..., errors: str = ...) -> _PT: ...
+@overload
+def force_text(s: _S, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> _S: ...
+@overload
+def force_text(s: Any, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> str: ...
+@overload
+def smart_bytes(s: _P, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> _P: ...
+@overload
+def smart_bytes(s: _PT, encoding: str = ..., strings_only: Literal[True] = ..., errors: str = ...) -> _PT: ...
+@overload
 def smart_bytes(s: Any, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> bytes: ...
+@overload
+def force_bytes(s: _PT, encoding: str = ..., strings_only: Literal[True] = ..., errors: str = ...) -> _PT: ...
+@overload
 def force_bytes(s: Any, encoding: str = ..., strings_only: bool = ..., errors: str = ...) -> bytes: ...
 
 smart_str = smart_text
 force_str = force_text
-
+@overload
-def iri_to_uri(iri: Optional[str]) -> Optional[str]: ...
+def iri_to_uri(iri: None) -> None: ...
-def uri_to_iri(uri: Optional[str]) -> Optional[str]: ...
+@overload
+def iri_to_uri(iri: Union[str, Promise]) -> str: ...
+@overload
+def uri_to_iri(iri: None) -> None: ...
+@overload
+def uri_to_iri(iri: str) -> str: ...
 def escape_uri_path(path: str) -> str: ...
 def repercent_broken_unicode(path: bytes) -> bytes: ...
-def filepath_to_uri(path: Optional[str]) -> Optional[str]: ...
+@overload
+def filepath_to_uri(path: None) -> None: ...
+@overload
+def filepath_to_uri(path: str) -> str: ...
 def get_system_encoding() -> str: ...
 
 DEFAULT_LOCALE_ENCODING: Any

django-stubs/utils/http.pyi

@@ -25,6 +25,9 @@ def urlsafe_base64_decode(s: Union[bytes, str]) -> bytes: ...
 def parse_etags(etag_str: str) -> List[str]: ...
 def quote_etag(etag_str: str) -> str: ...
 def is_same_domain(host: str, pattern: str) -> bool: ...
+def url_has_allowed_host_and_scheme(
+    url: Optional[str], allowed_hosts: Optional[Union[str, Iterable[str]]], require_https: bool = ...
+) -> bool: ...
 def is_safe_url(
     url: Optional[str], allowed_hosts: Optional[Union[str, Iterable[str]]], require_https: bool = ...
 ) -> bool: ...

django-stubs/utils/timezone.pyi

@@ -1,8 +1,10 @@
 import types
 from contextlib import ContextDecorator
-from datetime import date, datetime as datetime, time, timedelta as timedelta, tzinfo as tzinfo
+from datetime import date, datetime as datetime, time, timedelta as timedelta, tzinfo as tzinfo, timezone
 from typing import Optional, Union, Type
 
+from pytz import BaseTzInfo
+
 _AnyTime = Union[time, datetime]
 
 class UTC(tzinfo):
@@ -30,10 +32,14 @@ class LocalTimezone(ReferenceLocalTimezone):
 
 utc: UTC = ...
 
-def get_fixed_timezone(offset: Union[timedelta, int]) -> tzinfo: ...
+def get_fixed_timezone(offset: Union[timedelta, int]) -> timezone: ...
-def get_default_timezone() -> tzinfo: ...
+def get_default_timezone() -> BaseTzInfo: ...
 def get_default_timezone_name() -> str: ...
-def get_current_timezone() -> tzinfo: ...
+
+# Strictly speaking, it is possible to activate() a non-pytz timezone,
+# in which case BaseTzInfo is incorrect. However, this is unlikely,
+# so we use it anyway, to keep things ergonomic for most users.
+def get_current_timezone() -> BaseTzInfo: ...
 def get_current_timezone_name() -> str: ...
 def activate(timezone: Union[tzinfo, str]) -> None: ...
 def deactivate() -> None: ...

django-stubs/utils/tree.pyi

@@ -1,16 +1,16 @@
-from typing import Any, Dict, Iterable, Optional, Tuple, Union, Sequence
+from typing import Any, Dict, Iterable, Optional, Tuple, Union, Sequence, List
 
 from django.db.models.sql.where import NothingNode
 
+_NodeChildren = Iterable[Union["Node", NothingNode, Sequence[Any]]]
+
 class Node:
-    default: str = ...
+    children: List[Any]
+    default: Any = ...
     connector: str = ...
     negated: bool = ...
     def __init__(
-        self,
+        self, children: Optional[_NodeChildren] = ..., connector: Optional[str] = ..., negated: bool = ...
-        children: Optional[Iterable[Union[Node, NothingNode, Sequence[Any]]]] = ...,
-        connector: Optional[str] = ...,
-        negated: bool = ...,
     ) -> None: ...
     def __deepcopy__(self, memodict: Dict[Any, Any]) -> Node: ...
     def __len__(self) -> int: ...

django-stubs/views/debug.pyi

@@ -63,4 +63,4 @@ class ExceptionReporter:
     ): ...
 
 def technical_404_response(request: HttpRequest, exception: Http404) -> HttpResponse: ...
-def default_urlconf(request: HttpRequest) -> HttpResponse: ...
+def default_urlconf(request: Optional[HttpResponse]) -> HttpResponse: ...

django-stubs/views/generic/base.pyi

@@ -13,6 +13,7 @@ class View:
     def __init__(self, **kwargs: Any) -> None: ...
     @classmethod
     def as_view(cls: Any, **initkwargs: Any) -> Callable[..., http.HttpResponse]: ...
+    def setup(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> None: ...
     def dispatch(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> http.HttpResponse: ...
     def http_method_not_allowed(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> http.HttpResponse: ...
     def options(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> http.HttpResponse: ...

mypy_django_plugin/django/context.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from collections import defaultdict
 from contextlib import contextmanager
 from typing import (
@@ -48,6 +49,9 @@ def initialize_django(settings_module: str) -> Tuple['Apps', 'LazySettings']:
     with temp_environ():
         os.environ['DJANGO_SETTINGS_MODULE'] = settings_module
 
+        # add current directory to sys.path
+        sys.path.append(os.getcwd())
+
         def noop_class_getitem(cls, key):
             return cls
 
@@ -73,176 +77,12 @@ def initialize_django(settings_module: str) -> Tuple['Apps', 'LazySettings']:
     return apps, settings
 
 
-class DjangoFieldsContext:
-    def __init__(self, django_context: 'DjangoContext') -> None:
-        self.django_context = django_context
-
-    def get_attname(self, field: Field) -> str:
-        attname = field.attname
-        return attname
-
-    def get_field_nullability(self, field: Field, method: Optional[str]) -> bool:
-        nullable = field.null
-        if not nullable and isinstance(field, CharField) and field.blank:
-            return True
-        if method == '__init__':
-            if field.primary_key or isinstance(field, ForeignKey):
-                return True
-        if method == 'create':
-            if isinstance(field, AutoField):
-                return True
-        if field.has_default():
-            return True
-        return nullable
-
-    def get_field_set_type(self, api: TypeChecker, field: Field, *, method: str) -> MypyType:
-        """ Get a type of __set__ for this specific Django field. """
-        target_field = field
-        if isinstance(field, ForeignKey):
-            target_field = field.target_field
-
-        field_info = helpers.lookup_class_typeinfo(api, target_field.__class__)
-        if field_info is None:
-            return AnyType(TypeOfAny.from_error)
-
-        field_set_type = helpers.get_private_descriptor_type(field_info, '_pyi_private_set_type',
-                                                             is_nullable=self.get_field_nullability(field, method))
-        if isinstance(target_field, ArrayField):
-            argument_field_type = self.get_field_set_type(api, target_field.base_field, method=method)
-            field_set_type = helpers.convert_any_to_type(field_set_type, argument_field_type)
-        return field_set_type
-
-    def get_field_get_type(self, api: TypeChecker, field: Field, *, method: str) -> MypyType:
-        """ Get a type of __get__ for this specific Django field. """
-        field_info = helpers.lookup_class_typeinfo(api, field.__class__)
-        if field_info is None:
-            return AnyType(TypeOfAny.unannotated)
-
-        is_nullable = self.get_field_nullability(field, method)
-        if isinstance(field, RelatedField):
-            related_model_cls = self.django_context.fields_context.get_related_model_cls(field)
-
-            if method == 'values':
-                primary_key_field = self.django_context.get_primary_key_field(related_model_cls)
-                return self.get_field_get_type(api, primary_key_field, method=method)
-
-            model_info = helpers.lookup_class_typeinfo(api, related_model_cls)
-            if model_info is None:
-                return AnyType(TypeOfAny.unannotated)
-
-            return Instance(model_info, [])
-        else:
-            return helpers.get_private_descriptor_type(field_info, '_pyi_private_get_type',
-                                                       is_nullable=is_nullable)
-
-    def get_related_model_cls(self, field: Union[RelatedField, ForeignObjectRel]) -> Type[Model]:
-        if isinstance(field, RelatedField):
-            related_model_cls = field.remote_field.model
-        else:
-            related_model_cls = field.field.model
-
-        if isinstance(related_model_cls, str):
-            if related_model_cls == 'self':
-                # same model
-                related_model_cls = field.model
-            elif '.' not in related_model_cls:
-                # same file model
-                related_model_fullname = field.model.__module__ + '.' + related_model_cls
-                related_model_cls = self.django_context.get_model_class_by_fullname(related_model_fullname)
-            else:
-                related_model_cls = self.django_context.apps_registry.get_model(related_model_cls)
-
-        return related_model_cls
-
-
 class LookupsAreUnsupported(Exception):
     pass
 
 
-class DjangoLookupsContext:
-    def __init__(self, django_context: 'DjangoContext'):
-        self.django_context = django_context
-
-    def _resolve_field_from_parts(self, field_parts: Iterable[str], model_cls: Type[Model]) -> Field:
-        currently_observed_model = model_cls
-        field = None
-        for field_part in field_parts:
-            if field_part == 'pk':
-                field = self.django_context.get_primary_key_field(currently_observed_model)
-                continue
-
-            field = currently_observed_model._meta.get_field(field_part)
-            if isinstance(field, RelatedField):
-                currently_observed_model = field.related_model
-                model_name = currently_observed_model._meta.model_name
-                if (model_name is not None
-                        and field_part == (model_name + '_id')):
-                    field = self.django_context.get_primary_key_field(currently_observed_model)
-
-            if isinstance(field, ForeignObjectRel):
-                currently_observed_model = field.related_model
-
-        assert field is not None
-        return field
-
-    def resolve_lookup_info_field(self, model_cls: Type[Model], lookup: str) -> Field:
-        query = Query(model_cls)
-        lookup_parts, field_parts, is_expression = query.solve_lookup_type(lookup)
-        if lookup_parts:
-            raise LookupsAreUnsupported()
-
-        return self._resolve_field_from_parts(field_parts, model_cls)
-
-    def resolve_lookup_expected_type(self, ctx: MethodContext, model_cls: Type[Model], lookup: str) -> MypyType:
-        query = Query(model_cls)
-        try:
-            lookup_parts, field_parts, is_expression = query.solve_lookup_type(lookup)
-            if is_expression:
-                return AnyType(TypeOfAny.explicit)
-        except FieldError as exc:
-            ctx.api.fail(exc.args[0], ctx.context)
-            return AnyType(TypeOfAny.from_error)
-
-        field = self._resolve_field_from_parts(field_parts, model_cls)
-
-        lookup_cls = None
-        if lookup_parts:
-            lookup = lookup_parts[-1]
-            lookup_cls = field.get_lookup(lookup)
-            if lookup_cls is None:
-                # unknown lookup
-                return AnyType(TypeOfAny.explicit)
-
-        if lookup_cls is None or isinstance(lookup_cls, Exact):
-            return self.django_context.get_field_lookup_exact_type(helpers.get_typechecker_api(ctx), field)
-
-        assert lookup_cls is not None
-
-        lookup_info = helpers.lookup_class_typeinfo(helpers.get_typechecker_api(ctx), lookup_cls)
-        if lookup_info is None:
-            return AnyType(TypeOfAny.explicit)
-
-        for lookup_base in helpers.iter_bases(lookup_info):
-            if lookup_base.args and isinstance(lookup_base.args[0], Instance):
-                lookup_type: MypyType = lookup_base.args[0]
-                # if it's Field, consider lookup_type a __get__ of current field
-                if (isinstance(lookup_type, Instance)
-                        and lookup_type.type.fullname() == fullnames.FIELD_FULLNAME):
-                    field_info = helpers.lookup_class_typeinfo(helpers.get_typechecker_api(ctx), field.__class__)
-                    if field_info is None:
-                        return AnyType(TypeOfAny.explicit)
-                    lookup_type = helpers.get_private_descriptor_type(field_info, '_pyi_private_get_type',
-                                                                      is_nullable=field.null)
-                return lookup_type
-
-        return AnyType(TypeOfAny.explicit)
-
-
 class DjangoContext:
     def __init__(self, django_settings_module: str) -> None:
-        self.fields_context = DjangoFieldsContext(self)
-        self.lookups_context = DjangoLookupsContext(self)
-
         self.django_settings_module = django_settings_module
 
         apps, settings = initialize_django(self.django_settings_module)
@@ -284,20 +124,18 @@ class DjangoContext:
             if isinstance(field, ForeignObjectRel):
                 yield field
 
-    def get_field_lookup_exact_type(self, api: TypeChecker, field: Field) -> MypyType:
+    def get_field_lookup_exact_type(self, api: TypeChecker, field: Union[Field, ForeignObjectRel]) -> MypyType:
         if isinstance(field, (RelatedField, ForeignObjectRel)):
             related_model_cls = field.related_model
             primary_key_field = self.get_primary_key_field(related_model_cls)
-            primary_key_type = self.fields_context.get_field_get_type(api, primary_key_field, method='init')
+            primary_key_type = self.get_field_get_type(api, primary_key_field, method='init')
 
             rel_model_info = helpers.lookup_class_typeinfo(api, related_model_cls)
             if rel_model_info is None:
                 return AnyType(TypeOfAny.explicit)
 
-            model_and_primary_key_type = UnionType.make_union([Instance(rel_model_info, []),
+            model_and_primary_key_type = UnionType.make_union([Instance(rel_model_info, []), primary_key_type])
-                                                               primary_key_type])
             return helpers.make_optional(model_and_primary_key_type)
-            # return helpers.make_optional(Instance(rel_model_info, []))
 
         field_info = helpers.lookup_class_typeinfo(api, field.__class__)
         if field_info is None:
@@ -319,13 +157,13 @@ class DjangoContext:
         # add pk if not abstract=True
         if not model_cls._meta.abstract:
             primary_key_field = self.get_primary_key_field(model_cls)
-            field_set_type = self.fields_context.get_field_set_type(api, primary_key_field, method=method)
+            field_set_type = self.get_field_set_type(api, primary_key_field, method=method)
             expected_types['pk'] = field_set_type
 
         for field in model_cls._meta.get_fields():
             if isinstance(field, Field):
                 field_name = field.attname
-                field_set_type = self.fields_context.get_field_set_type(api, field, method=method)
+                field_set_type = self.get_field_set_type(api, field, method=method)
                 expected_types[field_name] = field_set_type
 
                 if isinstance(field, ForeignKey):
@@ -336,7 +174,11 @@ class DjangoContext:
                         expected_types[field_name] = AnyType(TypeOfAny.unannotated)
                         continue
 
-                    related_model = self.fields_context.get_related_model_cls(field)
+                    related_model = self.get_field_related_model_cls(field)
+                    if related_model is None:
+                        expected_types[field_name] = AnyType(TypeOfAny.from_error)
+                        continue
+
                     if related_model._meta.proxy_for_model is not None:
                         related_model = related_model._meta.proxy_for_model
 
@@ -345,7 +187,7 @@ class DjangoContext:
                         expected_types[field_name] = AnyType(TypeOfAny.unannotated)
                         continue
 
-                    is_nullable = self.fields_context.get_field_nullability(field, method)
+                    is_nullable = self.get_field_nullability(field, method)
                     foreign_key_set_type = helpers.get_private_descriptor_type(foreign_key_info,
                                                                                '_pyi_private_set_type',
                                                                                is_nullable=is_nullable)
@@ -365,13 +207,177 @@ class DjangoContext:
         return expected_types
 
     @cached_property
-    def model_base_classes(self) -> Set[str]:
+    def all_registered_model_classes(self) -> Set[Type[models.Model]]:
         model_classes = self.apps_registry.get_models()
 
         all_model_bases = set()
         for model_cls in model_classes:
             for base_cls in model_cls.mro():
                 if issubclass(base_cls, models.Model):
-                    all_model_bases.add(helpers.get_class_fullname(base_cls))
+                    all_model_bases.add(base_cls)
 
         return all_model_bases
+
+    @cached_property
+    def all_registered_model_class_fullnames(self) -> Set[str]:
+        return {helpers.get_class_fullname(cls) for cls in self.all_registered_model_classes}
+
+    def get_attname(self, field: Field) -> str:
+        attname = field.attname
+        return attname
+
+    def get_field_nullability(self, field: Union[Field, ForeignObjectRel], method: Optional[str]) -> bool:
+        nullable = field.null
+        if not nullable and isinstance(field, CharField) and field.blank:
+            return True
+        if method == '__init__':
+            if ((isinstance(field, Field) and field.primary_key)
+                    or isinstance(field, ForeignKey)):
+                return True
+        if method == 'create':
+            if isinstance(field, AutoField):
+                return True
+        if isinstance(field, Field) and field.has_default():
+            return True
+        return nullable
+
+    def get_field_set_type(self, api: TypeChecker, field: Union[Field, ForeignObjectRel], *, method: str) -> MypyType:
+        """ Get a type of __set__ for this specific Django field. """
+        target_field = field
+        if isinstance(field, ForeignKey):
+            target_field = field.target_field
+
+        field_info = helpers.lookup_class_typeinfo(api, target_field.__class__)
+        if field_info is None:
+            return AnyType(TypeOfAny.from_error)
+
+        field_set_type = helpers.get_private_descriptor_type(field_info, '_pyi_private_set_type',
+                                                             is_nullable=self.get_field_nullability(field, method))
+        if isinstance(target_field, ArrayField):
+            argument_field_type = self.get_field_set_type(api, target_field.base_field, method=method)
+            field_set_type = helpers.convert_any_to_type(field_set_type, argument_field_type)
+        return field_set_type
+
+    def get_field_get_type(self, api: TypeChecker, field: Union[Field, ForeignObjectRel], *, method: str) -> MypyType:
+        """ Get a type of __get__ for this specific Django field. """
+        field_info = helpers.lookup_class_typeinfo(api, field.__class__)
+        if field_info is None:
+            return AnyType(TypeOfAny.unannotated)
+
+        is_nullable = self.get_field_nullability(field, method)
+        if isinstance(field, RelatedField):
+            related_model_cls = self.get_field_related_model_cls(field)
+            if related_model_cls is None:
+                return AnyType(TypeOfAny.from_error)
+
+            if method == 'values':
+                primary_key_field = self.get_primary_key_field(related_model_cls)
+                return self.get_field_get_type(api, primary_key_field, method=method)
+
+            model_info = helpers.lookup_class_typeinfo(api, related_model_cls)
+            if model_info is None:
+                return AnyType(TypeOfAny.unannotated)
+
+            return Instance(model_info, [])
+        else:
+            return helpers.get_private_descriptor_type(field_info, '_pyi_private_get_type',
+                                                       is_nullable=is_nullable)
+
+    def get_field_related_model_cls(self, field: Union[RelatedField, ForeignObjectRel]) -> Optional[Type[Model]]:
+        if isinstance(field, RelatedField):
+            related_model_cls = field.remote_field.model
+        else:
+            related_model_cls = field.field.model
+
+        if isinstance(related_model_cls, str):
+            if related_model_cls == 'self':
+                # same model
+                related_model_cls = field.model
+            elif '.' not in related_model_cls:
+                # same file model
+                related_model_fullname = field.model.__module__ + '.' + related_model_cls
+                related_model_cls = self.get_model_class_by_fullname(related_model_fullname)
+            else:
+                related_model_cls = self.apps_registry.get_model(related_model_cls)
+
+        return related_model_cls
+
+    def _resolve_field_from_parts(self,
+                                  field_parts: Iterable[str],
+                                  model_cls: Type[Model]
+                                  ) -> Union[Field, ForeignObjectRel]:
+        currently_observed_model = model_cls
+        field = None
+        for field_part in field_parts:
+            if field_part == 'pk':
+                field = self.get_primary_key_field(currently_observed_model)
+                continue
+
+            field = currently_observed_model._meta.get_field(field_part)
+            if isinstance(field, RelatedField):
+                currently_observed_model = field.related_model
+                model_name = currently_observed_model._meta.model_name
+                if (model_name is not None
+                        and field_part == (model_name + '_id')):
+                    field = self.get_primary_key_field(currently_observed_model)
+
+            if isinstance(field, ForeignObjectRel):
+                currently_observed_model = field.related_model
+
+        assert field is not None
+        return field
+
+    def resolve_lookup_into_field(self, model_cls: Type[Model], lookup: str) -> Union[Field, ForeignObjectRel]:
+        query = Query(model_cls)
+        lookup_parts, field_parts, is_expression = query.solve_lookup_type(lookup)
+        if lookup_parts:
+            raise LookupsAreUnsupported()
+
+        return self._resolve_field_from_parts(field_parts, model_cls)
+
+    def resolve_lookup_expected_type(self, ctx: MethodContext, model_cls: Type[Model], lookup: str) -> MypyType:
+        query = Query(model_cls)
+        try:
+            lookup_parts, field_parts, is_expression = query.solve_lookup_type(lookup)
+            if is_expression:
+                return AnyType(TypeOfAny.explicit)
+        except FieldError as exc:
+            ctx.api.fail(exc.args[0], ctx.context)
+            return AnyType(TypeOfAny.from_error)
+
+        field = self._resolve_field_from_parts(field_parts, model_cls)
+
+        lookup_cls = None
+        if lookup_parts:
+            lookup = lookup_parts[-1]
+            lookup_cls = field.get_lookup(lookup)
+            if lookup_cls is None:
+                # unknown lookup
+                return AnyType(TypeOfAny.explicit)
+
+        if lookup_cls is None or isinstance(lookup_cls, Exact):
+            return self.get_field_lookup_exact_type(helpers.get_typechecker_api(ctx), field)
+
+        assert lookup_cls is not None
+
+        lookup_info = helpers.lookup_class_typeinfo(helpers.get_typechecker_api(ctx), lookup_cls)
+        if lookup_info is None:
+            return AnyType(TypeOfAny.explicit)
+
+        for lookup_base in helpers.iter_bases(lookup_info):
+            if lookup_base.args and isinstance(lookup_base.args[0], Instance):
+                lookup_type: MypyType = lookup_base.args[0]
+                # if it's Field, consider lookup_type a __get__ of current field
+                if (isinstance(lookup_type, Instance)
+                        and lookup_type.type.fullname == fullnames.FIELD_FULLNAME):
+                    field_info = helpers.lookup_class_typeinfo(helpers.get_typechecker_api(ctx), field.__class__)
+                    if field_info is None:
+                        return AnyType(TypeOfAny.explicit)
+                    lookup_type = helpers.get_private_descriptor_type(field_info, '_pyi_private_get_type',
+                                                                      is_nullable=field.null)
+                return lookup_type
+
+        return AnyType(TypeOfAny.explicit)
+
+    def resolve_f_expression_type(self, f_expression_type: Instance) -> MypyType:
+        return AnyType(TypeOfAny.explicit)

mypy_django_plugin/lib/fullnames.py

@@ -13,7 +13,7 @@ DUMMY_SETTINGS_BASE_CLASS = 'django.conf._DjangoConfLazyObject'
 QUERYSET_CLASS_FULLNAME = 'django.db.models.query.QuerySet'
 BASE_MANAGER_CLASS_FULLNAME = 'django.db.models.manager.BaseManager'
 MANAGER_CLASS_FULLNAME = 'django.db.models.manager.Manager'
-RELATED_MANAGER_CLASS_FULLNAME = 'django.db.models.manager.RelatedManager'
+RELATED_MANAGER_CLASS = 'django.db.models.manager.RelatedManager'
 
 BASEFORM_CLASS_FULLNAME = 'django.forms.forms.BaseForm'
 FORM_CLASS_FULLNAME = 'django.forms.forms.Form'
@@ -23,7 +23,7 @@ FORM_MIXIN_CLASS_FULLNAME = 'django.views.generic.edit.FormMixin'
 
 MANAGER_CLASSES = {
     MANAGER_CLASS_FULLNAME,
-    RELATED_MANAGER_CLASS_FULLNAME,
+    RELATED_MANAGER_CLASS,
     BASE_MANAGER_CLASS_FULLNAME,
     # QUERYSET_CLASS_FULLNAME
 }
@@ -37,3 +37,5 @@ RELATED_FIELDS_CLASSES = {
 MIGRATION_CLASS_FULLNAME = 'django.db.migrations.migration.Migration'
 OPTIONS_CLASS_FULLNAME = 'django.db.models.options.Options'
 HTTPREQUEST_CLASS_FULLNAME = 'django.http.request.HttpRequest'
+
+F_EXPRESSION_FULLNAME = 'django.db.models.expressions.F'

mypy_django_plugin/lib/helpers.py

@@ -1,6 +1,6 @@
 from collections import OrderedDict
 from typing import (
-    TYPE_CHECKING, Any, Dict, Iterable, Iterator, List, Optional, Set, Union, cast,
+    TYPE_CHECKING, Any, Dict, Iterable, Iterator, List, Optional, Set, Tuple, Union,
 )
 
 from django.db.models.fields import Field
@@ -10,13 +10,15 @@ from mypy import checker
 from mypy.checker import TypeChecker
 from mypy.mro import calculate_mro
 from mypy.nodes import (
-    GDEF, MDEF, Block, ClassDef, Expression, MemberExpr, MypyFile, NameExpr, StrExpr, SymbolNode, SymbolTable,
+    GDEF, MDEF, Argument, Block, ClassDef, Expression, FuncDef, MemberExpr, MypyFile, NameExpr, StrExpr, SymbolNode,
-    SymbolTableNode, TypeInfo, Var,
+    SymbolTable, SymbolTableNode, TypeInfo, Var,
 )
 from mypy.plugin import (
-    AttributeContext, CheckerPluginInterface, FunctionContext, MethodContext,
+    AttributeContext, CheckerPluginInterface, ClassDefContext, DynamicClassDefContext, FunctionContext, MethodContext,
 )
-from mypy.types import AnyType, Instance, NoneTyp, TupleType
+from mypy.plugins.common import add_method
+from mypy.semanal import SemanticAnalyzer
+from mypy.types import AnyType, CallableType, Instance, NoneTyp, TupleType
 from mypy.types import Type as MypyType
 from mypy.types import TypedDictType, TypeOfAny, UnionType
 
@@ -55,7 +57,7 @@ def lookup_fully_qualified_generic(name: str, all_modules: Dict[str, MypyFile])
     return sym.node
 
 
-def lookup_fully_qualified_typeinfo(api: TypeChecker, fullname: str) -> Optional[TypeInfo]:
+def lookup_fully_qualified_typeinfo(api: Union[TypeChecker, SemanticAnalyzer], fullname: str) -> Optional[TypeInfo]:
     node = lookup_fully_qualified_generic(fullname, api.modules)
     if not isinstance(node, TypeInfo):
         return None
@@ -173,32 +175,30 @@ def get_nested_meta_node_for_current_class(info: TypeInfo) -> Optional[TypeInfo]
     return None
 
 
-def add_new_class_for_module(module: MypyFile, name: str, bases: List[Instance],
+def add_new_class_for_module(module: MypyFile,
-                             fields: 'OrderedDict[str, MypyType]') -> TypeInfo:
+                             name: str,
+                             bases: List[Instance],
+                             fields: Optional[Dict[str, MypyType]] = None
+                             ) -> TypeInfo:
     new_class_unique_name = checker.gen_unique_name(name, module.names)
 
     # make new class expression
     classdef = ClassDef(new_class_unique_name, Block([]))
-    classdef.fullname = module.fullname() + '.' + new_class_unique_name
+    classdef.fullname = module.fullname + '.' + new_class_unique_name
 
     # make new TypeInfo
-    new_typeinfo = TypeInfo(SymbolTable(), classdef, module.fullname())
+    new_typeinfo = TypeInfo(SymbolTable(), classdef, module.fullname)
     new_typeinfo.bases = bases
     calculate_mro(new_typeinfo)
     new_typeinfo.calculate_metaclass_type()
 
-    def add_field_to_new_typeinfo(var: Var, is_initialized_in_class: bool = False,
-                                  is_property: bool = False) -> None:
-        var.info = new_typeinfo
-        var.is_initialized_in_class = is_initialized_in_class
-        var.is_property = is_property
-        var._fullname = new_typeinfo.fullname() + '.' + var.name()
-        new_typeinfo.names[var.name()] = SymbolTableNode(MDEF, var)
-
     # add fields
-    var_items = [Var(item, typ) for item, typ in fields.items()]
+    if fields:
-    for var_item in var_items:
+        for field_name, field_type in fields.items():
-        add_field_to_new_typeinfo(var_item, is_property=True)
+            var = Var(field_name, type=field_type)
+            var.info = new_typeinfo
+            var._fullname = new_typeinfo.fullname + '.' + field_name
+            new_typeinfo.names[field_name] = SymbolTableNode(MDEF, var, plugin_generated=True)
 
     classdef.info = new_typeinfo
     module.names[new_class_unique_name] = SymbolTableNode(GDEF, new_typeinfo, plugin_generated=True)
@@ -259,8 +259,7 @@ def make_typeddict(api: CheckerPluginInterface, fields: 'OrderedDict[str, MypyTy
     return typed_dict_type
 
 
-def resolve_string_attribute_value(attr_expr: Expression, ctx: Union[FunctionContext, MethodContext],
+def resolve_string_attribute_value(attr_expr: Expression, django_context: 'DjangoContext') -> Optional[str]:
-                                   django_context: 'DjangoContext') -> Optional[str]:
     if isinstance(attr_expr, StrExpr):
         return attr_expr.value
 
@@ -270,17 +269,66 @@ def resolve_string_attribute_value(attr_expr: Expression, ctx: Union[FunctionCon
         if isinstance(attr_expr.expr, NameExpr) and attr_expr.expr.fullname == 'django.conf.settings':
             if hasattr(django_context.settings, member_name):
                 return getattr(django_context.settings, member_name)
-
-    ctx.api.fail(f'Expression of type {type(attr_expr).__name__!r} is not supported', ctx.context)
     return None
 
 
+def get_semanal_api(ctx: Union[ClassDefContext, DynamicClassDefContext]) -> SemanticAnalyzer:
+    if not isinstance(ctx.api, SemanticAnalyzer):
+        raise ValueError('Not a SemanticAnalyzer')
+    return ctx.api
+
+
 def get_typechecker_api(ctx: Union[AttributeContext, MethodContext, FunctionContext]) -> TypeChecker:
     if not isinstance(ctx.api, TypeChecker):
         raise ValueError('Not a TypeChecker')
-    return cast(TypeChecker, ctx.api)
+    return ctx.api
 
 
 def is_model_subclass_info(info: TypeInfo, django_context: 'DjangoContext') -> bool:
-    return (info.fullname() in django_context.model_base_classes
+    return (info.fullname in django_context.all_registered_model_class_fullnames
             or info.has_base(fullnames.MODEL_CLASS_FULLNAME))
+
+
+def check_types_compatible(ctx: Union[FunctionContext, MethodContext],
+                           *, expected_type: MypyType, actual_type: MypyType, error_message: str) -> None:
+    api = get_typechecker_api(ctx)
+    api.check_subtype(actual_type, expected_type,
+                      ctx.context, error_message,
+                      'got', 'expected')
+
+
+def add_new_sym_for_info(info: TypeInfo, *, name: str, sym_type: MypyType) -> None:
+    # type=: type of the variable itself
+    var = Var(name=name, type=sym_type)
+    # var.info: type of the object variable is bound to
+    var.info = info
+    var._fullname = info.fullname + '.' + name
+    var.is_initialized_in_class = True
+    var.is_inferred = True
+    info.names[name] = SymbolTableNode(MDEF, var,
+                                       plugin_generated=True)
+
+
+def _prepare_new_method_arguments(node: FuncDef) -> Tuple[List[Argument], MypyType]:
+    arguments = []
+    for argument in node.arguments[1:]:
+        if argument.type_annotation is None:
+            argument.type_annotation = AnyType(TypeOfAny.unannotated)
+        arguments.append(argument)
+
+    if isinstance(node.type, CallableType):
+        return_type = node.type.ret_type
+    else:
+        return_type = AnyType(TypeOfAny.unannotated)
+
+    return arguments, return_type
+
+
+def copy_method_to_another_class(ctx: ClassDefContext, self_type: Instance,
+                                 new_method_name: str, method_node: FuncDef) -> None:
+    arguments, return_type = _prepare_new_method_arguments(method_node)
+    add_method(ctx,
+               new_method_name,
+               args=arguments,
+               return_type=return_type,
+               self_type=self_type)

mypy_django_plugin/main.py

@@ -7,15 +7,19 @@ from mypy.errors import Errors
 from mypy.nodes import MypyFile, TypeInfo
 from mypy.options import Options
 from mypy.plugin import (
-    AttributeContext, ClassDefContext, FunctionContext, MethodContext, Plugin,
+    AttributeContext, ClassDefContext, DynamicClassDefContext, FunctionContext, MethodContext, Plugin,
 )
 from mypy.types import Type as MypyType
 
+import mypy_django_plugin.transformers.orm_lookups
 from mypy_django_plugin.django.context import DjangoContext
 from mypy_django_plugin.lib import fullnames, helpers
 from mypy_django_plugin.transformers import (
     fields, forms, init_create, meta, querysets, request, settings,
 )
+from mypy_django_plugin.transformers.managers import (
+    create_new_manager_class_from_from_queryset_method,
+)
 from mypy_django_plugin.transformers.models import process_model_class
 
 
@@ -120,17 +124,17 @@ class NewSemanalDjangoPlugin(Plugin):
 
     def get_additional_deps(self, file: MypyFile) -> List[Tuple[int, str, int]]:
         # for settings
-        if file.fullname() == 'django.conf' and self.django_context.django_settings_module:
+        if file.fullname == 'django.conf' and self.django_context.django_settings_module:
             return [self._new_dependency(self.django_context.django_settings_module)]
 
         # for values / values_list
-        if file.fullname() == 'django.db.models':
+        if file.fullname == 'django.db.models':
             return [self._new_dependency('mypy_extensions'), self._new_dependency('typing')]
 
         # for `get_user_model()`
         if self.django_context.settings:
-            if (file.fullname() == 'django.contrib.auth'
+            if (file.fullname == 'django.contrib.auth'
-                    or file.fullname() in {'django.http', 'django.http.request'}):
+                    or file.fullname in {'django.http', 'django.http.request'}):
                 auth_user_model_name = self.django_context.settings.AUTH_USER_MODEL
                 try:
                     auth_user_module = self.django_context.apps_registry.get_model(auth_user_model_name).__module__
@@ -140,7 +144,7 @@ class NewSemanalDjangoPlugin(Plugin):
                 return [self._new_dependency(auth_user_module)]
 
         # ensure that all mentioned to='someapp.SomeModel' are loaded with corresponding related Fields
-        defined_model_classes = self.django_context.model_modules.get(file.fullname())
+        defined_model_classes = self.django_context.model_modules.get(file.fullname)
         if not defined_model_classes:
             return []
         deps = set()
@@ -148,15 +152,17 @@ class NewSemanalDjangoPlugin(Plugin):
             # forward relations
             for field in self.django_context.get_model_fields(model_class):
                 if isinstance(field, RelatedField):
-                    related_model_cls = self.django_context.fields_context.get_related_model_cls(field)
+                    related_model_cls = self.django_context.get_field_related_model_cls(field)
+                    if related_model_cls is None:
+                        continue
                     related_model_module = related_model_cls.__module__
-                    if related_model_module != file.fullname():
+                    if related_model_module != file.fullname:
                         deps.add(self._new_dependency(related_model_module))
             # reverse relations
             for relation in model_class._meta.related_objects:
-                related_model_cls = self.django_context.fields_context.get_related_model_cls(relation)
+                related_model_cls = self.django_context.get_field_related_model_cls(relation)
                 related_model_module = related_model_cls.__module__
-                if related_model_module != file.fullname():
+                if related_model_module != file.fullname:
                     deps.add(self._new_dependency(related_model_module))
         return list(deps)
 
@@ -210,12 +216,13 @@ class NewSemanalDjangoPlugin(Plugin):
         if class_fullname in manager_classes and method_name == 'create':
             return partial(init_create.redefine_and_typecheck_model_create, django_context=self.django_context)
         if class_fullname in manager_classes and method_name in {'filter', 'get', 'exclude'}:
-            return partial(init_create.typecheck_queryset_filter, django_context=self.django_context)
+            return partial(mypy_django_plugin.transformers.orm_lookups.typecheck_queryset_filter,
+                           django_context=self.django_context)
         return None
 
     def get_base_class_hook(self, fullname: str
                             ) -> Optional[Callable[[ClassDefContext], None]]:
-        if (fullname in self.django_context.model_base_classes
+        if (fullname in self.django_context.all_registered_model_class_fullnames
                 or fullname in self._get_current_model_bases()):
             return partial(transform_model_class, django_context=self.django_context)
 
@@ -238,6 +245,15 @@ class NewSemanalDjangoPlugin(Plugin):
             return partial(request.set_auth_user_model_as_type_for_request_user, django_context=self.django_context)
         return None
 
+    def get_dynamic_class_hook(self, fullname: str
+                               ) -> Optional[Callable[[DynamicClassDefContext], None]]:
+        if fullname.endswith('from_queryset'):
+            class_name, _, _ = fullname.rpartition('.')
+            info = self._get_typeinfo_or_none(class_name)
+            if info and info.has_base(fullnames.BASE_MANAGER_CLASS_FULLNAME):
+                return create_new_manager_class_from_from_queryset_method
+        return None
+
 
 def plugin(version):
     return NewSemanalDjangoPlugin

mypy_django_plugin/transformers/fields.py

@@ -29,7 +29,7 @@ def _get_current_field_from_assignment(ctx: FunctionContext, django_context: Dja
     if field_name is None:
         return None
 
-    model_cls = django_context.get_model_class_by_fullname(outer_model_info.fullname())
+    model_cls = django_context.get_model_class_by_fullname(outer_model_info.fullname)
     if model_cls is None:
         return None
 
@@ -37,6 +37,14 @@ def _get_current_field_from_assignment(ctx: FunctionContext, django_context: Dja
     return current_field
 
 
+def reparametrize_related_field_type(related_field_type: Instance, set_type, get_type) -> Instance:
+    args = [
+        helpers.convert_any_to_type(related_field_type.args[0], set_type),
+        helpers.convert_any_to_type(related_field_type.args[1], get_type),
+    ]
+    return helpers.reparametrize_instance(related_field_type, new_args=args)
+
+
 def fill_descriptor_types_for_related_field(ctx: FunctionContext, django_context: DjangoContext) -> MypyType:
     current_field = _get_current_field_from_assignment(ctx, django_context)
     if current_field is None:
@@ -44,7 +52,28 @@ def fill_descriptor_types_for_related_field(ctx: FunctionContext, django_context
 
     assert isinstance(current_field, RelatedField)
 
-    related_model_cls = django_context.fields_context.get_related_model_cls(current_field)
+    related_model_cls = django_context.get_field_related_model_cls(current_field)
+    if related_model_cls is None:
+        return AnyType(TypeOfAny.from_error)
+
+    default_related_field_type = set_descriptor_types_for_field(ctx)
+
+    # self reference with abstract=True on the model where ForeignKey is defined
+    current_model_cls = current_field.model
+    if (current_model_cls._meta.abstract
+            and current_model_cls == related_model_cls):
+        # for all derived non-abstract classes, set variable with this name to
+        # __get__/__set__ of ForeignKey of derived model
+        for model_cls in django_context.all_registered_model_classes:
+            if issubclass(model_cls, current_model_cls) and not model_cls._meta.abstract:
+                derived_model_info = helpers.lookup_class_typeinfo(helpers.get_typechecker_api(ctx), model_cls)
+                if derived_model_info is not None:
+                    fk_ref_type = Instance(derived_model_info, [])
+                    derived_fk_type = reparametrize_related_field_type(default_related_field_type,
+                                                                       set_type=fk_ref_type, get_type=fk_ref_type)
+                    helpers.add_new_sym_for_info(derived_model_info,
+                                                 name=current_field.name,
+                                                 sym_type=derived_fk_type)
 
     related_model = related_model_cls
     related_model_to_set = related_model_cls
@@ -67,13 +96,10 @@ def fill_descriptor_types_for_related_field(ctx: FunctionContext, django_context
     else:
         related_model_to_set_type = Instance(related_model_to_set_info, [])  # type: ignore
 
-    default_related_field_type = set_descriptor_types_for_field(ctx)
     # replace Any with referred_to_type
-    args = [
+    return reparametrize_related_field_type(default_related_field_type,
-        helpers.convert_any_to_type(default_related_field_type.args[0], related_model_to_set_type),
+                                            set_type=related_model_to_set_type,
-        helpers.convert_any_to_type(default_related_field_type.args[1], related_model_type),
+                                            get_type=related_model_type)
-    ]
-    return helpers.reparametrize_instance(default_related_field_type, new_args=args)
 
 
 def get_field_descriptor_types(field_info: TypeInfo, is_nullable: bool) -> Tuple[MypyType, MypyType]:

mypy_django_plugin/transformers/init_create.py

@@ -6,7 +6,7 @@ from mypy.types import Instance
 from mypy.types import Type as MypyType
 
 from mypy_django_plugin.django.context import DjangoContext
-from mypy_django_plugin.lib import fullnames, helpers
+from mypy_django_plugin.lib import helpers
 
 
 def get_actual_types(ctx: Union[MethodContext, FunctionContext],
@@ -30,12 +30,6 @@ def get_actual_types(ctx: Union[MethodContext, FunctionContext],
     return actual_types
 
 
-def check_types_compatible(ctx, *, expected_type, actual_type, error_message):
-    ctx.api.check_subtype(actual_type, expected_type,
-                          ctx.context, error_message,
-                          'got', 'expected')
-
-
 def typecheck_model_method(ctx: Union[FunctionContext, MethodContext], django_context: DjangoContext,
                            model_cls: Type[Model], method: str) -> MypyType:
     typechecker_api = helpers.get_typechecker_api(ctx)
@@ -48,11 +42,11 @@ def typecheck_model_method(ctx: Union[FunctionContext, MethodContext], django_co
                                                                            model_cls.__name__),
                          ctx.context)
             continue
-        check_types_compatible(ctx,
+        helpers.check_types_compatible(ctx,
-                               expected_type=expected_types[actual_name],
+                                       expected_type=expected_types[actual_name],
-                               actual_type=actual_type,
+                                       actual_type=actual_type,
-                               error_message='Incompatible type for "{}" of "{}"'.format(actual_name,
+                                       error_message='Incompatible type for "{}" of "{}"'.format(actual_name,
-                                                                                         model_cls.__name__))
+                                                                                                 model_cls.__name__))
 
     return ctx.default_return_type
 
@@ -60,7 +54,7 @@ def typecheck_model_method(ctx: Union[FunctionContext, MethodContext], django_co
 def redefine_and_typecheck_model_init(ctx: FunctionContext, django_context: DjangoContext) -> MypyType:
     assert isinstance(ctx.default_return_type, Instance)
 
-    model_fullname = ctx.default_return_type.type.fullname()
+    model_fullname = ctx.default_return_type.type.fullname
     model_cls = django_context.get_model_class_by_fullname(model_fullname)
     if model_cls is None:
         return ctx.default_return_type
@@ -73,46 +67,9 @@ def redefine_and_typecheck_model_create(ctx: MethodContext, django_context: Djan
         # only work with ctx.default_return_type = model Instance
         return ctx.default_return_type
 
-    model_fullname = ctx.default_return_type.type.fullname()
+    model_fullname = ctx.default_return_type.type.fullname
     model_cls = django_context.get_model_class_by_fullname(model_fullname)
     if model_cls is None:
         return ctx.default_return_type
 
     return typecheck_model_method(ctx, django_context, model_cls, 'create')
-
-
-def typecheck_queryset_filter(ctx: MethodContext, django_context: DjangoContext) -> MypyType:
-    lookup_kwargs = ctx.arg_names[1]
-    provided_lookup_types = ctx.arg_types[1]
-
-    assert isinstance(ctx.type, Instance)
-
-    if not ctx.type.args or not isinstance(ctx.type.args[0], Instance):
-        return ctx.default_return_type
-
-    model_cls_fullname = ctx.type.args[0].type.fullname()
-    model_cls = django_context.get_model_class_by_fullname(model_cls_fullname)
-    if model_cls is None:
-        return ctx.default_return_type
-
-    for lookup_kwarg, provided_type in zip(lookup_kwargs, provided_lookup_types):
-        if lookup_kwarg is None:
-            continue
-        # Combinables are not supported yet
-        if (isinstance(provided_type, Instance)
-                and provided_type.type.has_base('django.db.models.expressions.Combinable')):
-            continue
-
-        lookup_type = django_context.lookups_context.resolve_lookup_expected_type(ctx, model_cls, lookup_kwarg)
-        # Managers as provided_type is not supported yet
-        if (isinstance(provided_type, Instance)
-                and helpers.has_any_of_bases(provided_type.type, (fullnames.MANAGER_CLASS_FULLNAME,
-                                                                  fullnames.QUERYSET_CLASS_FULLNAME))):
-            return ctx.default_return_type
-
-        check_types_compatible(ctx,
-                               expected_type=lookup_type,
-                               actual_type=provided_type,
-                               error_message=f'Incompatible type for lookup {lookup_kwarg!r}:')
-
-    return ctx.default_return_type

mypy_django_plugin/transformers/managers.py

@@ -0,0 +1,71 @@
+from mypy.nodes import (
+    GDEF, FuncDef, MemberExpr, NameExpr, StrExpr, SymbolTableNode, TypeInfo,
+)
+from mypy.plugin import ClassDefContext, DynamicClassDefContext
+from mypy.types import AnyType, Instance, TypeOfAny
+
+from mypy_django_plugin.lib import helpers
+
+
+def create_new_manager_class_from_from_queryset_method(ctx: DynamicClassDefContext) -> None:
+    semanal_api = helpers.get_semanal_api(ctx)
+
+    assert isinstance(ctx.call.callee, MemberExpr)
+    assert isinstance(ctx.call.callee.expr, NameExpr)
+    base_manager_info = ctx.call.callee.expr.node
+    if base_manager_info is None:
+        if not semanal_api.final_iteration:
+            semanal_api.defer()
+        return
+
+    assert isinstance(base_manager_info, TypeInfo)
+    new_manager_info = semanal_api.basic_new_typeinfo(ctx.name,
+                                                      basetype_or_fallback=Instance(base_manager_info,
+                                                                                    [AnyType(TypeOfAny.unannotated)]))
+    new_manager_info.line = ctx.call.line
+    new_manager_info.defn.line = ctx.call.line
+    new_manager_info.metaclass_type = new_manager_info.calculate_metaclass_type()
+
+    current_module = semanal_api.cur_mod_node
+    current_module.names[ctx.name] = SymbolTableNode(GDEF, new_manager_info,
+                                                     plugin_generated=True)
+    passed_queryset = ctx.call.args[0]
+    assert isinstance(passed_queryset, NameExpr)
+
+    derived_queryset_fullname = passed_queryset.fullname
+    assert derived_queryset_fullname is not None
+
+    sym = semanal_api.lookup_fully_qualified_or_none(derived_queryset_fullname)
+    assert sym is not None
+    if sym.node is None:
+        if not semanal_api.final_iteration:
+            semanal_api.defer()
+        else:
+            # inherit from Any to prevent false-positives, if queryset class cannot be resolved
+            new_manager_info.fallback_to_any = True
+        return
+
+    derived_queryset_info = sym.node
+    assert isinstance(derived_queryset_info, TypeInfo)
+
+    if len(ctx.call.args) > 1:
+        expr = ctx.call.args[1]
+        assert isinstance(expr, StrExpr)
+        custom_manager_generated_name = expr.value
+    else:
+        custom_manager_generated_name = base_manager_info.name + 'From' + derived_queryset_info.name
+
+    custom_manager_generated_fullname = '.'.join(['django.db.models.manager', custom_manager_generated_name])
+    if 'from_queryset_managers' not in base_manager_info.metadata:
+        base_manager_info.metadata['from_queryset_managers'] = {}
+    base_manager_info.metadata['from_queryset_managers'][custom_manager_generated_fullname] = new_manager_info.fullname
+
+    class_def_context = ClassDefContext(cls=new_manager_info.defn,
+                                        reason=ctx.call, api=semanal_api)
+    self_type = Instance(new_manager_info, [])
+    for name, sym in derived_queryset_info.names.items():
+        if isinstance(sym.node, FuncDef):
+            helpers.copy_method_to_another_class(class_def_context,
+                                                 self_type,
+                                                 new_method_name=name,
+                                                 method_node=sym.node)

mypy_django_plugin/transformers/meta.py

@@ -28,7 +28,7 @@ def return_proper_field_type_from_get_field(ctx: MethodContext, django_context:
     if not isinstance(model_type, Instance):
         return ctx.default_return_type
 
-    model_cls = django_context.get_model_class_by_fullname(model_type.type.fullname())
+    model_cls = django_context.get_model_class_by_fullname(model_type.type.fullname)
     if model_cls is None:
         return ctx.default_return_type
 
@@ -36,7 +36,7 @@ def return_proper_field_type_from_get_field(ctx: MethodContext, django_context:
     if field_name_expr is None:
         return ctx.default_return_type
 
-    field_name = helpers.resolve_string_attribute_value(field_name_expr, ctx, django_context)
+    field_name = helpers.resolve_string_attribute_value(field_name_expr, django_context)
     if field_name is None:
         return ctx.default_return_type
 

mypy_django_plugin/transformers/models.py

@@ -1,5 +1,4 @@
-from collections import OrderedDict
+from typing import Dict, Optional, Type, cast
-from typing import Type
 
 from django.db.models.base import Model
 from django.db.models.fields import DateField, DateTimeField
@@ -7,12 +6,13 @@ from django.db.models.fields.related import ForeignKey
 from django.db.models.fields.reverse_related import (
     ManyToManyRel, ManyToOneRel, OneToOneRel,
 )
-from mypy.nodes import (
+from mypy.nodes import ARG_STAR2, Argument, Context, FuncDef, TypeInfo, Var
-    ARG_STAR2, MDEF, Argument, SymbolTableNode, TypeInfo, Var,
-)
 from mypy.plugin import ClassDefContext
 from mypy.plugins import common
-from mypy.types import AnyType, Instance, TypeOfAny
+from mypy.semanal import SemanticAnalyzer
+from mypy.types import AnyType, Instance
+from mypy.types import Type as MypyType
+from mypy.types import TypeOfAny
 
 from mypy_django_plugin.django.context import DjangoContext
 from mypy_django_plugin.lib import fullnames, helpers
@@ -21,36 +21,42 @@ from mypy_django_plugin.transformers.fields import get_field_descriptor_types
 
 
 class ModelClassInitializer:
+    api: SemanticAnalyzer
+
     def __init__(self, ctx: ClassDefContext, django_context: DjangoContext):
-        self.api = ctx.api
+        self.api = cast(SemanticAnalyzer, ctx.api)
         self.model_classdef = ctx.cls
         self.django_context = django_context
         self.ctx = ctx
 
+    def lookup_typeinfo(self, fullname: str) -> Optional[TypeInfo]:
+        return helpers.lookup_fully_qualified_typeinfo(self.api, fullname)
+
     def lookup_typeinfo_or_incomplete_defn_error(self, fullname: str) -> TypeInfo:
-        sym = self.api.lookup_fully_qualified_or_none(fullname)
+        info = self.lookup_typeinfo(fullname)
-        if sym is None or not isinstance(sym.node, TypeInfo):
+        if info is None:
             raise helpers.IncompleteDefnException(f'No {fullname!r} found')
-        return sym.node
+        return info
 
     def lookup_class_typeinfo_or_incomplete_defn_error(self, klass: type) -> TypeInfo:
         fullname = helpers.get_class_fullname(klass)
         field_info = self.lookup_typeinfo_or_incomplete_defn_error(fullname)
         return field_info
 
-    def create_new_var(self, name: str, typ: Instance) -> Var:
+    def create_new_var(self, name: str, typ: MypyType) -> Var:
         # type=: type of the variable itself
         var = Var(name=name, type=typ)
         # var.info: type of the object variable is bound to
         var.info = self.model_classdef.info
-        var._fullname = self.model_classdef.info.fullname() + '.' + name
+        var._fullname = self.model_classdef.info.fullname + '.' + name
         var.is_initialized_in_class = True
         var.is_inferred = True
         return var
 
-    def add_new_node_to_model_class(self, name: str, typ: Instance) -> None:
+    def add_new_node_to_model_class(self, name: str, typ: MypyType) -> None:
-        var = self.create_new_var(name, typ)
+        helpers.add_new_sym_for_info(self.model_classdef.info,
-        self.model_classdef.info.names[name] = SymbolTableNode(MDEF, var, plugin_generated=True)
+                                     name=name,
+                                     sym_type=typ)
 
     def run(self) -> None:
         model_cls = self.django_context.get_model_class_by_fullname(self.model_classdef.fullname)
@@ -99,48 +105,130 @@ class AddRelatedModelsId(ModelClassInitializer):
     def run_with_model_cls(self, model_cls: Type[Model]) -> None:
         for field in model_cls._meta.get_fields():
             if isinstance(field, ForeignKey):
-                related_model_cls = self.django_context.fields_context.get_related_model_cls(field)
+                related_model_cls = self.django_context.get_field_related_model_cls(field)
+                if related_model_cls is None:
+                    error_context: Context = self.ctx.cls
+                    field_sym = self.ctx.cls.info.get(field.name)
+                    if field_sym is not None and field_sym.node is not None:
+                        error_context = field_sym.node
+                    self.api.fail(f'Cannot find model {field.related_model!r} '
+                                  f'referenced in field {field.name!r} ',
+                                  ctx=error_context)
+                    self.add_new_node_to_model_class(field.attname,
+                                                     AnyType(TypeOfAny.explicit))
+                    continue
+
+                if related_model_cls._meta.abstract:
+                    continue
+
                 rel_primary_key_field = self.django_context.get_primary_key_field(related_model_cls)
-                field_info = self.lookup_class_typeinfo_or_incomplete_defn_error(rel_primary_key_field.__class__)
+                try:
-                is_nullable = self.django_context.fields_context.get_field_nullability(field, None)
+                    field_info = self.lookup_class_typeinfo_or_incomplete_defn_error(rel_primary_key_field.__class__)
+                except helpers.IncompleteDefnException as exc:
+                    if not self.api.final_iteration:
+                        raise exc
+                    else:
+                        continue
+
+                is_nullable = self.django_context.get_field_nullability(field, None)
                 set_type, get_type = get_field_descriptor_types(field_info, is_nullable)
                 self.add_new_node_to_model_class(field.attname,
                                                  Instance(field_info, [set_type, get_type]))
 
 
 class AddManagers(ModelClassInitializer):
-    def _is_manager_any(self, typ: Instance) -> bool:
+    def has_any_parametrized_manager_as_base(self, info: TypeInfo) -> bool:
-        return typ.type.fullname() == fullnames.MANAGER_CLASS_FULLNAME and type(typ.args[0]) == AnyType
+        for base in helpers.iter_bases(info):
+            if self.is_any_parametrized_manager(base):
+                return True
+        return False
+
+    def is_any_parametrized_manager(self, typ: Instance) -> bool:
+        return typ.type.fullname == fullnames.MANAGER_CLASS_FULLNAME and isinstance(typ.args[0], AnyType)
+
+    def get_generated_manager_mappings(self, base_manager_fullname: str) -> Dict[str, str]:
+        base_manager_info = self.lookup_typeinfo(base_manager_fullname)
+        if (base_manager_info is None
+                or 'from_queryset_managers' not in base_manager_info.metadata):
+            return {}
+        return base_manager_info.metadata['from_queryset_managers']
+
+    def create_new_model_parametrized_manager(self, name: str, base_manager_info: TypeInfo) -> Instance:
+        bases = []
+        for original_base in base_manager_info.bases:
+            if self.is_any_parametrized_manager(original_base):
+                if original_base.type is None:
+                    raise helpers.IncompleteDefnException()
+
+                original_base = helpers.reparametrize_instance(original_base,
+                                                               [Instance(self.model_classdef.info, [])])
+            bases.append(original_base)
+
+        current_module = self.api.modules[self.model_classdef.info.module_name]
+        custom_manager_info = helpers.add_new_class_for_module(current_module,
+                                                               name=name, bases=bases)
+        # copy fields to a new manager
+        new_cls_def_context = ClassDefContext(cls=custom_manager_info.defn,
+                                              reason=self.ctx.reason,
+                                              api=self.api)
+        custom_manager_type = Instance(custom_manager_info, [Instance(self.model_classdef.info, [])])
+
+        for name, sym in base_manager_info.names.items():
+            # replace self type with new class, if copying method
+            if isinstance(sym.node, FuncDef):
+                helpers.copy_method_to_another_class(new_cls_def_context,
+                                                     self_type=custom_manager_type,
+                                                     new_method_name=name,
+                                                     method_node=sym.node)
+                continue
+
+            new_sym = sym.copy()
+            if isinstance(new_sym.node, Var):
+                new_var = Var(name, type=sym.type)
+                new_var.info = custom_manager_info
+                new_var._fullname = custom_manager_info.fullname + '.' + name
+                new_sym.node = new_var
+            custom_manager_info.names[name] = new_sym
+
+        return custom_manager_type
 
     def run_with_model_cls(self, model_cls: Type[Model]) -> None:
         for manager_name, manager in model_cls._meta.managers_map.items():
+            manager_class_name = manager.__class__.__name__
             manager_fullname = helpers.get_class_fullname(manager.__class__)
-            manager_info = self.lookup_typeinfo_or_incomplete_defn_error(manager_fullname)
+            try:
+                manager_info = self.lookup_typeinfo_or_incomplete_defn_error(manager_fullname)
+            except helpers.IncompleteDefnException as exc:
+                if not self.api.final_iteration:
+                    raise exc
+                else:
+                    base_manager_fullname = helpers.get_class_fullname(manager.__class__.__bases__[0])
+                    generated_managers = self.get_generated_manager_mappings(base_manager_fullname)
+                    if manager_fullname not in generated_managers:
+                        # not a generated manager, continue with the loop
+                        continue
+                    real_manager_fullname = generated_managers[manager_fullname]
+                    manager_info = self.lookup_typeinfo(real_manager_fullname)  # type: ignore
+                    if manager_info is None:
+                        continue
+                    manager_class_name = real_manager_fullname.rsplit('.', maxsplit=1)[1]
 
             if manager_name not in self.model_classdef.info.names:
                 manager_type = Instance(manager_info, [Instance(self.model_classdef.info, [])])
                 self.add_new_node_to_model_class(manager_name, manager_type)
             else:
                 # creates new MODELNAME_MANAGERCLASSNAME class that represents manager parametrized with current model
-                has_manager_any_base = any(self._is_manager_any(base) for base in manager_info.bases)
+                if not self.has_any_parametrized_manager_as_base(manager_info):
-                if has_manager_any_base:
+                    continue
-                    custom_model_manager_name = manager.model.__name__ + '_' + manager.__class__.__name__
-                    bases = []
-                    for original_base in manager_info.bases:
-                        if self._is_manager_any(original_base):
-                            if original_base.type is None:
-                                raise helpers.IncompleteDefnException()
 
-                            original_base = helpers.reparametrize_instance(original_base,
+                custom_model_manager_name = manager.model.__name__ + '_' + manager_class_name
-                                                                           [Instance(self.model_classdef.info, [])])
+                try:
-                        bases.append(original_base)
+                    custom_manager_type = self.create_new_model_parametrized_manager(custom_model_manager_name,
-                    current_module = self.api.modules[self.model_classdef.info.module_name]
+                                                                                     base_manager_info=manager_info)
-                    custom_manager_info = helpers.add_new_class_for_module(current_module,
+                except helpers.IncompleteDefnException:
-                                                                           custom_model_manager_name,
+                    continue
-                                                                           bases=bases,
+
-                                                                           fields=OrderedDict())
+                self.add_new_node_to_model_class(manager_name, custom_manager_type)
-                    custom_manager_type = Instance(custom_manager_info, [Instance(self.model_classdef.info, [])])
-                    self.add_new_node_to_model_class(manager_name, custom_manager_type)
 
 
 class AddDefaultManagerAttribute(ModelClassInitializer):
@@ -162,15 +250,30 @@ class AddRelatedManagers(ModelClassInitializer):
                 # no reverse accessor
                 continue
 
-            related_model_cls = self.django_context.fields_context.get_related_model_cls(relation)
+            related_model_cls = self.django_context.get_field_related_model_cls(relation)
-            related_model_info = self.lookup_class_typeinfo_or_incomplete_defn_error(related_model_cls)
+            if related_model_cls is None:
+                continue
+
+            try:
+                related_model_info = self.lookup_class_typeinfo_or_incomplete_defn_error(related_model_cls)
+            except helpers.IncompleteDefnException as exc:
+                if not self.api.final_iteration:
+                    raise exc
+                else:
+                    continue
 
             if isinstance(relation, OneToOneRel):
                 self.add_new_node_to_model_class(attname, Instance(related_model_info, []))
                 continue
 
             if isinstance(relation, (ManyToOneRel, ManyToManyRel)):
-                manager_info = self.lookup_typeinfo_or_incomplete_defn_error(fullnames.RELATED_MANAGER_CLASS_FULLNAME)
+                try:
+                    manager_info = self.lookup_typeinfo_or_incomplete_defn_error(fullnames.RELATED_MANAGER_CLASS)
+                except helpers.IncompleteDefnException as exc:
+                    if not self.api.final_iteration:
+                        raise exc
+                    else:
+                        continue
                 self.add_new_node_to_model_class(attname,
                                                  Instance(manager_info, [Instance(related_model_info, [])]))
                 continue