Recover after #909 (#925)

* Fix stubs related to `(Async)RequestFactory` and `(Async)Client` * Revert incorrect removal. * Allow set as `unique_together`, use shared type alias. * Revert `Q.__init__` to use only `*args, **kwargs` to remove false-positive with `Q(**{...})` * Add abstract methods to `HttpResponseBase` to create common interface. * Remove monkey-patched attributes from `HttpResponseBase` subclasses. * Add QueryDict mutability checks (+ plugin support) * Fix lint * Return back GenericForeignKey to `Options.get_fields` * Minor fixup * Make plugin code typecheck with `--warn-unreachable`, minor performance increase. * Better types for `{unique, index}_together` and Options. * Fix odd type of `URLResolver.urlconf_name` which isn't a str actually. * Better types for field migration operations. * Revert form.files to `MultiValueDict[str, UploadedFile]` * Compatibility fix (#916) * Do not assume that `Annotated` is always related to django-stubs (fixes #893) * Restrict `FormView.get_form` return type to `_FormT` (class type argument). Now it is resolved to `form_class` argument if present, but also errors if it is not subclass of _FormT * Fix CI (make test runnable on 3.8) * Fix CI (make test runnable on 3.8 _again_)
2025-12-14 15:57:08 +08:00 · 2022-04-28 13:01:37 +03:00
parent 16499a22ab
commit 6226381484
29 changed files with 380 additions and 138 deletions
--- a/django-stubs/core/handlers/asgi.pyi
+++ b/django-stubs/core/handlers/asgi.pyi
@@ -15,7 +15,7 @@ from typing import (
 )

 from django.core.handlers import base as base
-from django.http import HttpRequest, QueryDict
+from django.http.request import HttpRequest, _ImmutableQueryDict
 from django.http.response import HttpResponseBase
 from django.urls.resolvers import ResolverMatch, URLResolver
 from django.utils.datastructures import MultiValueDict
@@ -34,8 +34,8 @@ class ASGIRequest(HttpRequest):
    META: Dict[str, Any] = ...
    def __init__(self, scope: Mapping[str, Any], body_file: IO[bytes]) -> None: ...
    @property
-    def GET(self) -> QueryDict: ...  # type: ignore
-    POST: QueryDict = ...
+    def GET(self) -> _ImmutableQueryDict: ...  # type: ignore
+    POST: _ImmutableQueryDict = ...
    FILES: MultiValueDict = ...
    @property
    def COOKIES(self) -> Dict[str, str]: ...  # type: ignore
--- a/django-stubs/db/migrations/operations/fields.pyi
+++ b/django-stubs/db/migrations/operations/fields.pyi
@@ -1,4 +1,4 @@
-from typing import Any, Optional
+from typing import Optional

 from django.db.models.fields import Field

@@ -23,15 +23,15 @@ class AddField(FieldOperation):
 class RemoveField(FieldOperation): ...

 class AlterField(FieldOperation):
-    field: Any = ...
-    preserve_default: Any = ...
+    field: Field = ...
+    preserve_default: bool = ...
    def __init__(self, model_name: str, name: str, field: Field, preserve_default: bool = ...) -> None: ...

 class RenameField(FieldOperation):
-    old_name: Any = ...
-    new_name: Any = ...
+    old_name: str = ...
+    new_name: str = ...
    def __init__(self, model_name: str, old_name: str, new_name: str) -> None: ...
    @property
-    def old_name_lower(self): ...
+    def old_name_lower(self) -> str: ...
    @property
    def new_name_lower(self) -> str: ...
--- a/django-stubs/db/migrations/operations/models.pyi
+++ b/django-stubs/db/migrations/operations/models.pyi
@@ -1,4 +1,4 @@
-from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, Type, TypeVar, Union
+from typing import Any, Dict, List, Optional, Sequence, Set, Tuple, Type, Union

 from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.operations.base import Operation
@@ -7,9 +7,7 @@ from django.db.models.constraints import BaseConstraint
 from django.db.models.fields import Field
 from django.db.models.indexes import Index
 from django.db.models.manager import Manager
-from django.utils.datastructures import _ListOrTuple
-
-_T = TypeVar("_T")
+from django.db.models.options import _OptionTogetherT

 class ModelOperation(Operation):
    name: str = ...
@@ -53,10 +51,10 @@ class AlterTogetherOptionOperation(ModelOptionOperation):
    def __init__(
        self,
        name: str,
-        option_value: _ListOrTuple[Tuple[str, str]],
+        option_value: Optional[_OptionTogetherT],
    ) -> None: ...
    @property
-    def option_value(self) -> Set[Tuple[str, str]]: ...
+    def option_value(self) -> Optional[Set[Tuple[str, ...]]]: ...
    def deconstruct(self) -> Tuple[str, Sequence[Any], Dict[str, Any]]: ...
    def state_forwards(self, app_label: str, state: Any) -> None: ...
    def database_forwards(
@@ -72,26 +70,26 @@ class AlterTogetherOptionOperation(ModelOptionOperation):

 class AlterUniqueTogether(AlterTogetherOptionOperation):
    option_name: str = ...
-    unique_together: _ListOrTuple[Tuple[str, str]] = ...
-    def __init__(self, name: str, unique_together: _ListOrTuple[Tuple[str, str]]) -> None: ...
+    unique_together: Optional[Set[Tuple[str, ...]]] = ...
+    def __init__(self, name: str, unique_together: Optional[_OptionTogetherT]) -> None: ...

 class AlterIndexTogether(AlterTogetherOptionOperation):
    option_name: str = ...
-    index_together: _ListOrTuple[Tuple[str, str]] = ...
-    def __init__(self, name: str, index_together: _ListOrTuple[Tuple[str, str]]) -> None: ...
+    index_together: Optional[Set[Tuple[str, ...]]] = ...
+    def __init__(self, name: str, index_together: Optional[_OptionTogetherT]) -> None: ...

 class AlterOrderWithRespectTo(ModelOptionOperation):
    order_with_respect_to: str = ...
    def __init__(self, name: str, order_with_respect_to: str) -> None: ...

 class AlterModelOptions(ModelOptionOperation):
-    ALTER_OPTION_KEYS: Any = ...
-    options: Dict[str, str] = ...
+    ALTER_OPTION_KEYS: List[str] = ...
+    options: Dict[str, Any] = ...
    def __init__(self, name: str, options: Dict[str, Any]) -> None: ...

 class AlterModelManagers(ModelOptionOperation):
-    managers: Any = ...
-    def __init__(self, name: Any, managers: Any) -> None: ...
+    managers: Sequence[Manager] = ...
+    def __init__(self, name: str, managers: Sequence[Manager]) -> None: ...

 class IndexOperation(Operation):
    option_name: str = ...
--- a/django-stubs/db/migrations/operations/special.pyi
+++ b/django-stubs/db/migrations/operations/special.pyi
@@ -1,13 +1,9 @@
 import sys
-from typing import Any, Dict, List, Mapping, Optional, Sequence, Tuple, Union
+from typing import Any, Mapping, Optional, Sequence, Union

 from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.migrations.state import StateApps
-
-if sys.version_info < (3, 8):
-    from typing_extensions import Literal
-else:
-    from typing import Literal
+from django.utils.datastructures import _ListOrTuple

 from .base import Operation

@@ -25,14 +21,14 @@ class SeparateDatabaseAndState(Operation):

 class RunSQL(Operation):
    noop: Literal[""] = ...
-    sql: Union[str, List[str], Tuple[str, ...]] = ...
-    reverse_sql: Optional[Union[str, List[str], Tuple[str, ...]]] = ...
+    sql: Union[str, _ListOrTuple[str]] = ...
+    reverse_sql: Optional[Union[str, _ListOrTuple[str]]] = ...
    state_operations: Sequence[Operation] = ...
    hints: Mapping[str, Any] = ...
    def __init__(
        self,
-        sql: Union[str, List[str], Tuple[str, ...]],
-        reverse_sql: Optional[Union[str, List[str], Tuple[str, ...]]] = ...,
+        sql: Union[str, _ListOrTuple[str]],
+        reverse_sql: Optional[Union[str, _ListOrTuple[str]]] = ...,
        state_operations: Sequence[Operation] = ...,
        hints: Optional[Mapping[str, Any]] = ...,
        elidable: bool = ...,
@@ -44,13 +40,13 @@ class _CodeCallable(Protocol):
 class RunPython(Operation):
    code: _CodeCallable = ...
    reverse_code: Optional[_CodeCallable] = ...
-    hints: Optional[Dict[str, Any]] = ...
+    hints: Mapping[str, Any] = ...
    def __init__(
        self,
        code: _CodeCallable,
        reverse_code: Optional[_CodeCallable] = ...,
        atomic: Optional[bool] = ...,
-        hints: Optional[Dict[str, Any]] = ...,
+        hints: Optional[Mapping[str, Any]] = ...,
        elidable: bool = ...,
    ) -> None: ...
    @staticmethod
--- a/django-stubs/db/models/options.pyi
+++ b/django-stubs/db/models/options.pyi
@@ -1,4 +1,5 @@
-from typing import Any, Dict, Generic, Iterable, List, Optional, Sequence, Set, Tuple, Type, TypeVar, Union
+import sys
+from typing import Any, Dict, Generic, Iterable, List, Optional, Sequence, Set, Tuple, Type, TypeVar, Union, overload

 from django.apps.config import AppConfig
 from django.apps.registry import Apps
@@ -11,16 +12,26 @@ from django.db.models.fields.related import ManyToManyField, OneToOneField
 from django.db.models.fields.reverse_related import ForeignObjectRel
 from django.db.models.manager import Manager
 from django.db.models.query_utils import PathInfo
-from django.utils.datastructures import ImmutableList
+from django.utils.datastructures import ImmutableList, _ListOrTuple
+
+if sys.version_info < (3, 8):
+    from typing_extensions import Literal
+else:
+    from typing import Literal

 PROXY_PARENTS: object
 EMPTY_RELATION_TREE: Any
 IMMUTABLE_WARNING: str
 DEFAULT_NAMES: Tuple[str, ...]

-def normalize_together(
-    option_together: Union[List[Tuple[str, str]], Tuple[Tuple[str, str], ...], Tuple[()], Tuple[str, str]]
-) -> Tuple[Tuple[str, str], ...]: ...
+_OptionTogetherT = Union[_ListOrTuple[Union[_ListOrTuple[str], str]], Set[Tuple[str, ...]]]
+
+@overload
+def normalize_together(option_together: _ListOrTuple[Union[_ListOrTuple[str], str]]) -> Tuple[Tuple[str, ...], ...]: ...
+
+# Any other value will be returned unchanged, but probably only set is semantically allowed
+@overload
+def normalize_together(option_together: Set[Tuple[str, ...]]) -> Set[Tuple[str, ...]]: ...

 _T = TypeVar("_T")

@@ -45,18 +56,18 @@ class Options(Generic[_M]):
    db_table: str = ...
    ordering: Optional[Sequence[str]] = ...
    indexes: List[Any] = ...
-    unique_together: Union[Sequence[Tuple[str, str]], Tuple[str, str]] = ...
-    index_together: Union[Sequence[Tuple[str, str]], Tuple[str, str]] = ...
+    unique_together: Sequence[Tuple[str]] = ...  # Are always normalized
+    index_together: Sequence[Tuple[str]] = ...  # Are always normalized
    select_on_save: bool = ...
    default_permissions: Sequence[str] = ...
    permissions: List[Any] = ...
    object_name: Optional[str] = ...
    app_label: str = ...
    get_latest_by: Optional[Sequence[str]] = ...
-    order_with_respect_to: Optional[Any] = ...
+    order_with_respect_to: Optional[str] = ...
    db_tablespace: str = ...
-    required_db_features: List[Any] = ...
-    required_db_vendor: Any = ...
+    required_db_features: List[str] = ...
+    required_db_vendor: Optional[Literal["sqlite", "postgresql", "mysql", "oracle"]] = ...
    meta: Optional[type] = ...
    pk: Optional[Field] = ...
    auto_field: Optional[AutoField] = ...
@@ -105,7 +116,7 @@ class Options(Generic[_M]):
    def default_manager(self) -> Optional[Manager]: ...
    @property
    def fields(self) -> ImmutableList[Field[Any, Any]]: ...
-    def get_field(self, field_name: str) -> Union[Field, ForeignObjectRel]: ...
+    def get_field(self, field_name: str) -> Union[Field, ForeignObjectRel, GenericForeignKey]: ...
    def get_base_chain(self, model: Type[Model]) -> List[Type[Model]]: ...
    def get_parent_list(self) -> List[Type[Model]]: ...
    def get_ancestor_link(self, ancestor: Type[Model]) -> Optional[OneToOneField]: ...
@@ -113,7 +124,7 @@ class Options(Generic[_M]):
    def get_path_from_parent(self, parent: Type[Model]) -> List[PathInfo]: ...
    def get_fields(
        self, include_parents: bool = ..., include_hidden: bool = ...
-    ) -> List[Union[Field[Any, Any], ForeignObjectRel]]: ...
+    ) -> List[Union[Field[Any, Any], ForeignObjectRel, GenericForeignKey]]: ...
    @property
    def total_unique_constraints(self) -> List[UniqueConstraint]: ...
    @property
--- a/django-stubs/db/models/query_utils.pyi
+++ b/django-stubs/db/models/query_utils.pyi
@@ -45,7 +45,9 @@ class Q(tree.Node):
    AND: str = ...
    OR: str = ...
    conditional: bool = ...
-    def __init__(self, *args: Any, _connector: Optional[Any] = ..., _negated: bool = ..., **kwargs: Any) -> None: ...
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    # Fake signature, the real is
+    # def __init__(self, *args: Any, _connector: Optional[Any] = ..., _negated: bool = ..., **kwargs: Any) -> None: ...
    def __or__(self, other: Q) -> Q: ...
    def __and__(self, other: Q) -> Q: ...
    def __invert__(self) -> Q: ...
--- a/django-stubs/db/utils.pyi
+++ b/django-stubs/db/utils.pyi
@@ -41,6 +41,8 @@ class ConnectionRouter:
    def __init__(self, routers: Optional[Iterable[Any]] = ...) -> None: ...
    @property
    def routers(self) -> List[Any]: ...
+    def db_for_read(self, model: Type[Model], **hints: Any) -> str: ...
+    def db_for_write(self, model: Type[Model], **hints: Any) -> str: ...
    def allow_relation(self, obj1: Model, obj2: Model, **hints: Any) -> bool: ...
    def allow_migrate(self, db: str, app_label: str, **hints: Any) -> bool: ...
    def allow_migrate_model(self, db: str, model: Type[Model]) -> bool: ...
--- a/django-stubs/forms/utils.pyi
+++ b/django-stubs/forms/utils.pyi
@@ -3,11 +3,12 @@ from datetime import datetime
 from typing import Any, Dict, Iterable, List, Mapping, Optional, Sequence, Union

 from django.core.exceptions import ValidationError
-from django.core.files import File
+from django.core.files.uploadedfile import UploadedFile
+from django.utils.datastructures import MultiValueDict
 from django.utils.safestring import SafeString

 _DataT = Mapping[str, Any]
-_FilesT = Mapping[str, Iterable[File]]
+_FilesT = MultiValueDict[str, UploadedFile]

 def pretty_name(name: str) -> str: ...
 def flatatt(attrs: Dict[str, Any]) -> SafeString: ...
--- a/django-stubs/http/request.pyi
+++ b/django-stubs/http/request.pyi
@@ -1,3 +1,4 @@
+import sys
 from io import BytesIO
 from typing import (
    Any,
@@ -6,6 +7,7 @@ from typing import (
    Iterable,
    List,
    Mapping,
+    NoReturn,
    Optional,
    Pattern,
    Set,
@@ -24,6 +26,11 @@ from django.core.files import uploadedfile, uploadhandler
 from django.urls import ResolverMatch
 from django.utils.datastructures import CaseInsensitiveMapping, ImmutableList, MultiValueDict

+if sys.version_info < (3, 8):
+    from typing_extensions import Literal
+else:
+    from typing import Literal
+
 RAISE_ERROR: object = ...
 host_validation_re: Pattern[str] = ...

@@ -40,8 +47,8 @@ class HttpHeaders(CaseInsensitiveMapping[str]):
    def parse_header_name(cls, header: str) -> Optional[str]: ...

 class HttpRequest(BytesIO):
-    GET: QueryDict = ...
-    POST: QueryDict = ...
+    GET: _ImmutableQueryDict = ...
+    POST: _ImmutableQueryDict = ...
    COOKIES: Dict[str, str] = ...
    META: Dict[str, Any] = ...
    FILES: MultiValueDict[str, uploadedfile.UploadedFile] = ...
@@ -55,7 +62,15 @@ class HttpRequest(BytesIO):
    site: Site
    session: SessionBase
    _stream: BinaryIO
-    def __init__(self) -> None: ...
+    # The magic. If we instantiate HttpRequest directly somewhere, it has
+    # mutable GET and POST. However, both ASGIRequest and WSGIRequest have immutable,
+    # so when we use HttpRequest to refer to any of them we want exactly this.
+    # Case when some function creates *exactly* HttpRequest (not subclass)
+    # remain uncovered, however it's probably the best solution we can afford.
+    def __new__(cls) -> _MutableHttpRequest: ...
+    # When both __init__ and __new__ are present, mypy will prefer __init__
+    # (see comments in mypy.checkmember.type_object_type)
+    # def __init__(self) -> None: ...
    def get_host(self) -> str: ...
    def get_port(self) -> str: ...
    def get_full_path(self, force_append_slash: bool = ...) -> str: ...
@@ -90,17 +105,43 @@ class HttpRequest(BytesIO):
    def _load_post_and_files(self) -> None: ...
    def accepts(self, media_type: str) -> bool: ...

+class _MutableHttpRequest(HttpRequest):
+    GET: QueryDict = ...  # type: ignore[assignment]
+    POST: QueryDict = ...  # type: ignore[assignment]
+
 _Q = TypeVar("_Q", bound="QueryDict")
+_Z = TypeVar("_Z")

 class QueryDict(MultiValueDict[str, str]):
    _mutable: bool = ...
+    # We can make it mutable only by specifying `mutable=True`.
+    # It can be done a) with kwarg and b) with pos. arg. `overload` has
+    # some problems with args/kwargs + Literal, so two signatures are required.
+    # ('querystring', True, [...])
+    @overload
    def __init__(
-        self, query_string: Optional[Union[str, bytes]] = ..., mutable: bool = ..., encoding: Optional[str] = ...
+        self: QueryDict,
+        query_string: Optional[Union[str, bytes]],
+        mutable: Literal[True],
+        encoding: Optional[str] = ...,
+    ) -> None: ...
+    # ([querystring='string',] mutable=True, [...])
+    @overload
+    def __init__(
+        self: QueryDict,
+        *,
+        mutable: Literal[True],
+        query_string: Optional[Union[str, bytes]] = ...,
+        encoding: Optional[str] = ...,
+    ) -> None: ...
+    # Otherwise it's immutable
+    @overload
+    def __init__(  # type: ignore[misc]
+        self: _ImmutableQueryDict,
+        query_string: Optional[Union[str, bytes]] = ...,
+        mutable: bool = ...,
+        encoding: Optional[str] = ...,
    ) -> None: ...
-    def setlist(self, key: Union[str, bytes], list_: Iterable[Union[str, bytes]]) -> None: ...
-    def setlistdefault(self, key: Union[str, bytes], default_list: Optional[List[str]] = ...) -> List[str]: ...
-    def appendlist(self, key: Union[str, bytes], value: Union[str, bytes]) -> None: ...
-    def urlencode(self, safe: Optional[str] = ...) -> str: ...
    @classmethod
    def fromkeys(  # type: ignore
        cls: Type[_Q],
@@ -114,7 +155,46 @@ class QueryDict(MultiValueDict[str, str]):
    @encoding.setter
    def encoding(self, value: str) -> None: ...
    def __setitem__(self, key: Union[str, bytes], value: Union[str, bytes]) -> None: ...
+    def __delitem__(self, key: Union[str, bytes]) -> None: ...
+    def setlist(self, key: Union[str, bytes], list_: Iterable[Union[str, bytes]]) -> None: ...
+    def setlistdefault(self, key: Union[str, bytes], default_list: Optional[List[str]] = ...) -> List[str]: ...
+    def appendlist(self, key: Union[str, bytes], value: Union[str, bytes]) -> None: ...
+    # Fake signature (because *args is used in source, but it fails with more that 1 argument)
+    @overload
+    def pop(self, key: Union[str, bytes], /) -> str: ...
+    @overload
+    def pop(self, key: Union[str, bytes], default: Union[str, _Z] = ..., /) -> Union[str, _Z]: ...
+    def popitem(self) -> Tuple[str, str]: ...
+    def clear(self) -> None: ...
    def setdefault(self, key: Union[str, bytes], default: Union[str, bytes, None] = ...) -> str: ...
+    def copy(self) -> QueryDict: ...
+    def urlencode(self, safe: Optional[str] = ...) -> str: ...
+
+class _ImmutableQueryDict(QueryDict):
+    _mutable: Literal[False]
+    # def __init__(
+    #     self, query_string: Optional[Union[str, bytes]] = ..., mutable: bool = ..., encoding: Optional[str] = ...
+    # ) -> None: ...
+    def __setitem__(self, key: Union[str, bytes], value: Union[str, bytes]) -> NoReturn: ...
+    def __delitem__(self, key: Union[str, bytes]) -> NoReturn: ...
+    def setlist(self, key: Union[str, bytes], list_: Iterable[Union[str, bytes]]) -> NoReturn: ...
+    def setlistdefault(self, key: Union[str, bytes], default_list: Optional[List[str]] = ...) -> NoReturn: ...
+    def appendlist(self, key: Union[str, bytes], value: Union[str, bytes]) -> NoReturn: ...
+    # Fake signature (because *args is used in source, but it fails with more that 1 argument)
+    @overload
+    def pop(self, key: Union[str, bytes], /) -> NoReturn: ...
+    @overload
+    def pop(self, key: Union[str, bytes], default: Union[str, _Z] = ..., /) -> NoReturn: ...
+    def popitem(self) -> NoReturn: ...
+    def clear(self) -> NoReturn: ...
+    def setdefault(self, key: Union[str, bytes], default: Union[str, bytes, None] = ...) -> NoReturn: ...
+    def copy(self) -> QueryDict: ...  # type: ignore[override]
+    def urlencode(self, safe: Optional[str] = ...) -> str: ...
+    # Fakes for convenience (for `request.GET` and `request.POST`). If dict
+    # was created by Django, there is no chance to hit `List[object]` (empty list)
+    # edge case.
+    def __getitem__(self, key: str) -> str: ...
+    def dict(self) -> Dict[str, str]: ...  # type: ignore[override]

 class MediaType:
    def __init__(self, media_type_raw_line: str) -> None: ...
--- a/django-stubs/http/response.pyi
+++ b/django-stubs/http/response.pyi
@@ -1,13 +1,9 @@
 import datetime
 from io import BytesIO
 from json import JSONEncoder
-from typing import Any, Dict, Iterable, Iterator, List, Optional, Tuple, Type, TypeVar, Union, overload
+from typing import Any, Dict, Iterable, Iterator, List, Optional, Tuple, Type, TypeVar, Union, overload, type_check_only

-from django.core.handlers.wsgi import WSGIRequest
 from django.http.cookie import SimpleCookie
-from django.template import Context, Template
-from django.test.client import Client
-from django.urls import ResolverMatch
 from django.utils.datastructures import CaseInsensitiveMapping, _PropertyDescriptor

 class BadHeaderError(ValueError): ...
@@ -82,6 +78,12 @@ class HttpResponseBase:
    def writable(self) -> bool: ...
    def writelines(self, lines: Iterable[object]) -> None: ...

+    # Fake methods that are implemented by all subclasses
+    @type_check_only
+    def __iter__(self) -> Iterator[bytes]: ...
+    @type_check_only
+    def getvalue(self) -> bytes: ...
+
 class HttpResponse(HttpResponseBase, Iterable[bytes]):
    content = _PropertyDescriptor[object, bytes]()
    csrf_cookie_set: bool
@@ -94,14 +96,6 @@ class HttpResponse(HttpResponseBase, Iterable[bytes]):
    def serialize(self) -> bytes: ...
    __bytes__ = serialize
    def __iter__(self) -> Iterator[bytes]: ...
-    # Attributes assigned by monkey-patching in test client ClientHandler.__call__()
-    wsgi_request: WSGIRequest
-    # Attributes assigned by monkey-patching in test client Client.request()
-    client: Client
-    request: Dict[str, Any]
-    templates: List[Template]
-    context: Context
-    resolver_match: ResolverMatch
    def getvalue(self) -> bytes: ...

 class StreamingHttpResponse(HttpResponseBase, Iterable[bytes]):
@@ -111,13 +105,7 @@ class StreamingHttpResponse(HttpResponseBase, Iterable[bytes]):
    def getvalue(self) -> bytes: ...

 class FileResponse(StreamingHttpResponse):
-    client: Client
-    context: None
    file_to_stream: Optional[BytesIO]
-    request: Dict[str, str]
-    resolver_match: ResolverMatch
-    templates: List[Any]
-    wsgi_request: WSGIRequest
    block_size: int = ...
    as_attachment: bool = ...
    filename: str = ...
--- a/django-stubs/test/client.pyi
+++ b/django-stubs/test/client.pyi
@@ -3,6 +3,7 @@ from json import JSONEncoder
 from types import TracebackType
 from typing import (
    Any,
+    Awaitable,
    Callable,
    Dict,
    Generic,
@@ -26,6 +27,8 @@ from django.core.handlers.wsgi import WSGIRequest
 from django.http.cookie import SimpleCookie
 from django.http.request import HttpRequest
 from django.http.response import HttpResponseBase
+from django.template.base import Template
+from django.urls import ResolverMatch

 BOUNDARY: str = ...
 MULTIPART_CONTENT: str = ...
@@ -49,27 +52,25 @@ _T = TypeVar("_T")
 def closing_iterator_wrapper(iterable: Iterable[_T], close: Callable[[], Any]) -> Iterator[_T]: ...
 def conditional_content_removal(request: HttpRequest, response: HttpResponseBase) -> HttpResponseBase: ...

+class _WSGIResponse(HttpResponseBase):
+    wsgi_request: WSGIRequest
+
+class _ASGIResponse(HttpResponseBase):
+    asgi_request: ASGIRequest
+
 class ClientHandler(BaseHandler):
    enforce_csrf_checks: bool = ...
    def __init__(self, enforce_csrf_checks: bool = ..., *args: Any, **kwargs: Any) -> None: ...
-    def __call__(self, environ: Dict[str, Any]) -> HttpResponseBase: ...
+    def __call__(self, environ: Dict[str, Any]) -> _WSGIResponse: ...

 class AsyncClientHandler(BaseHandler):
    enforce_csrf_checks: bool = ...
    def __init__(self, enforce_csrf_checks: bool = ..., *args: Any, **kwargs: Any) -> None: ...
-    async def __call__(self, scope: Dict[str, Any]) -> HttpResponseBase: ...
+    async def __call__(self, scope: Dict[str, Any]) -> _ASGIResponse: ...

 def encode_multipart(boundary: str, data: Dict[str, Any]) -> bytes: ...
 def encode_file(boundary: str, key: str, file: Any) -> List[bytes]: ...

-# fake to distinguish WSGIRequest and ASGIRequest
-
-_R = TypeVar("_R", bound=HttpRequest)
-
-class _MonkeyPatchedHttpResponseBase(Generic[_R], HttpResponseBase):
-    def json(self) -> Any: ...
-    wsgi_request: _R
-
 class _RequestFactory(Generic[_T]):
    json_encoder: Type[JSONEncoder]
    defaults: Dict[str, str]
@@ -102,9 +103,9 @@ class _RequestFactory(Generic[_T]):
        **extra: Any
    ) -> _T: ...

-class RequestFactory(_RequestFactory[_T]): ...
+class RequestFactory(_RequestFactory[WSGIRequest]): ...

-class AsyncRequestFactory(_RequestFactory[_T]):
+class _AsyncRequestFactory(_RequestFactory[_T]):
    def request(self, **request: Any) -> _T: ...
    def generic(
        self,
@@ -116,6 +117,25 @@ class AsyncRequestFactory(_RequestFactory[_T]):
        **extra: Any
    ) -> _T: ...

+class AsyncRequestFactory(_AsyncRequestFactory[ASGIRequest]): ...
+
+# fakes to distinguish WSGIRequest and ASGIRequest
+class _MonkeyPatchedWSGIResponse(_WSGIResponse):
+    def json(self) -> Any: ...
+    request: Dict[str, Any]
+    client: Client
+    templates: List[Template]
+    context: List[Dict[str, Any]]
+    resolver_match: ResolverMatch
+
+class _MonkeyPatchedASGIResponse(_ASGIResponse):
+    def json(self) -> Any: ...
+    request: Dict[str, Any]
+    client: AsyncClient
+    templates: List[Template]
+    context: List[Dict[str, Any]]
+    resolver_match: ResolverMatch
+
 class ClientMixin:
    def store_exc_info(self, **kwargs: Any) -> None: ...
    def check_exception(self, response: HttpResponseBase) -> NoReturn: ...
@@ -125,7 +145,7 @@ class ClientMixin:
    def force_login(self, user: AbstractBaseUser, backend: Optional[str] = ...) -> None: ...
    def logout(self) -> None: ...

-class Client(ClientMixin, RequestFactory[_MonkeyPatchedHttpResponseBase[WSGIRequest]]):
+class Client(ClientMixin, _RequestFactory[_MonkeyPatchedWSGIResponse]):
    handler: ClientHandler
    raise_request_exception: bool
    exc_info: Optional[Tuple[Type[BaseException], BaseException, TracebackType]]
@@ -133,19 +153,19 @@ class Client(ClientMixin, RequestFactory[_MonkeyPatchedHttpResponseBase[WSGIRequ
        self, enforce_csrf_checks: bool = ..., raise_request_exception: bool = ..., **defaults: Any
    ) -> None: ...
    # Silence type warnings, since this class overrides arguments and return types in an unsafe manner.
-    def request(self, **request: Any) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    def request(self, **request: Any) -> _MonkeyPatchedWSGIResponse: ...
    def get(  # type: ignore
        self, path: str, data: Any = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def post(  # type: ignore
        self, path: str, data: Any = ..., content_type: str = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def head(  # type: ignore
        self, path: str, data: Any = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def trace(  # type: ignore
        self, path: str, data: Any = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def options(  # type: ignore
        self,
        path: str,
@@ -154,18 +174,18 @@ class Client(ClientMixin, RequestFactory[_MonkeyPatchedHttpResponseBase[WSGIRequ
        follow: bool = ...,
        secure: bool = ...,
        **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def put(  # type: ignore
        self, path: str, data: Any = ..., content_type: str = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def patch(  # type: ignore
        self, path: str, data: Any = ..., content_type: str = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...
    def delete(  # type: ignore
        self, path: str, data: Any = ..., content_type: str = ..., follow: bool = ..., secure: bool = ..., **extra: Any
-    ) -> _MonkeyPatchedHttpResponseBase[WSGIRequest]: ...
+    ) -> _MonkeyPatchedWSGIResponse: ...

-class AsyncClient(ClientMixin, AsyncRequestFactory[_MonkeyPatchedHttpResponseBase[ASGIRequest]]):
+class AsyncClient(ClientMixin, _AsyncRequestFactory[Awaitable[_MonkeyPatchedASGIResponse]]):
    handler: AsyncClientHandler
    raise_request_exception: bool
    exc_info: Any
@@ -173,4 +193,4 @@ class AsyncClient(ClientMixin, AsyncRequestFactory[_MonkeyPatchedHttpResponseBas
    def __init__(
        self, enforce_csrf_checks: bool = ..., raise_request_exception: bool = ..., **defaults: Any
    ) -> None: ...
-    async def request(self, **request: Any) -> _MonkeyPatchedHttpResponseBase[ASGIRequest]: ...  # type: ignore
+    async def request(self, **request: Any) -> _MonkeyPatchedASGIResponse: ...
--- a/django-stubs/test/testcases.pyi
+++ b/django-stubs/test/testcases.pyi
@@ -28,7 +28,7 @@ from django.db.models.query import QuerySet, RawQuerySet
 from django.forms.fields import EmailField
 from django.http.response import HttpResponse, HttpResponseBase
 from django.template.base import Template
-from django.test.client import Client
+from django.test.client import AsyncClient, Client
 from django.test.html import Element
 from django.test.utils import CaptureQueriesContext, ContextList
 from django.utils.functional import classproperty
@@ -64,8 +64,10 @@ class _DatabaseFailure:
    def __call__(self) -> None: ...

 class SimpleTestCase(unittest.TestCase):
-    client_class: Any = ...
+    client_class: Type[Client] = ...
    client: Client
+    async_client_class: Type[AsyncClient] = ...
+    async_client: AsyncClient
    allow_database_queries: bool = ...
    # TODO: str -> Literal['__all__']
    databases: Union[Set[str], str] = ...
@@ -142,9 +144,7 @@ class SimpleTestCase(unittest.TestCase):
    ) -> Any: ...
    def assertHTMLEqual(self, html1: str, html2: str, msg: Optional[str] = ...) -> None: ...
    def assertHTMLNotEqual(self, html1: str, html2: str, msg: Optional[str] = ...) -> None: ...
-    def assertInHTML(
-        self, needle: str, haystack: SafeString, count: Optional[int] = ..., msg_prefix: str = ...
-    ) -> None: ...
+    def assertInHTML(self, needle: str, haystack: str, count: Optional[int] = ..., msg_prefix: str = ...) -> None: ...
    def assertJSONEqual(
        self,
        raw: str,
--- a/django-stubs/urls/resolvers.pyi
+++ b/django-stubs/urls/resolvers.pyi
@@ -1,4 +1,5 @@
-from typing import Any, Callable, Dict, Iterable, List, Optional, Pattern, Tuple, Type, Union, overload
+from types import ModuleType
+from typing import Any, Callable, Dict, List, Optional, Pattern, Sequence, Tuple, Type, Union, overload

 from django.core.checks.messages import CheckMessage
 from django.urls.converters import UUIDConverter
@@ -93,7 +94,7 @@ class URLPattern:

 class URLResolver:
    pattern: LocalePrefixPattern = ...
-    urlconf_name: Optional[str] = ...
+    urlconf_name: Union[str, None, Sequence[Union[URLPattern, URLResolver]]] = ...
    callback: None = ...
    default_kwargs: Dict[str, Any] = ...
    namespace: Optional[str] = ...
@@ -103,7 +104,7 @@ class URLResolver:
    def __init__(
        self,
        pattern: LocalePrefixPattern,
-        urlconf_name: Optional[str],
+        urlconf_name: Union[str, None, Sequence[Union[URLPattern, URLResolver]]],
        default_kwargs: Optional[Dict[str, Any]] = ...,
        app_name: Optional[str] = ...,
        namespace: Optional[str] = ...,
@@ -115,7 +116,7 @@ class URLResolver:
    @property
    def app_dict(self) -> Dict[str, List[str]]: ...
    @property
-    def urlconf_module(self) -> Optional[List[Tuple[str, Callable]]]: ...
+    def urlconf_module(self) -> Union[ModuleType, None, Sequence[Union[URLPattern, URLResolver]]]: ...
    @property
    def url_patterns(self) -> List[Union[URLPattern, URLResolver]]: ...
    def resolve(self, path: str) -> ResolverMatch: ...
--- a/django-stubs/utils/functional.pyi
+++ b/django-stubs/utils/functional.pyi
@@ -72,7 +72,7 @@ class classproperty(Generic[_Get]):
    fget: Optional[Callable[[_Self], _Get]] = ...
    def __init__(self, method: Optional[Callable[[_Self], _Get]] = ...) -> None: ...
    def __get__(self, instance: Optional[_Self], cls: Type[_Self] = ...) -> _Get: ...
-    def getter(self, method: Callable[[Type[_Self]], _Get]) -> classproperty[_Get]: ...
+    def getter(self, method: Callable[[_Self], _Get]) -> classproperty[_Get]: ...

 class _Getter(Protocol[_Get]):
    """Type fake to declare some read-only properties (until `property` builtin is generic)
--- a/django-stubs/views/generic/edit.pyi
+++ b/django-stubs/views/generic/edit.pyi
@@ -26,7 +26,7 @@ class FormMixin(Generic[_FormT], ContextMixin):
    def get_initial(self) -> Dict[str, Any]: ...
    def get_prefix(self) -> Optional[str]: ...
    def get_form_class(self) -> Type[_FormT]: ...
-    def get_form(self, form_class: Optional[Type[_FormT]] = ...) -> BaseForm: ...
+    def get_form(self, form_class: Optional[Type[_FormT]] = ...) -> _FormT: ...
    def get_form_kwargs(self) -> Dict[str, Any]: ...
    def get_success_url(self) -> str: ...
    def form_valid(self, form: _FormT) -> HttpResponse: ...
--- a/django_stubs_ext/django_stubs_ext/types.py
+++ b/django_stubs_ext/django_stubs_ext/types.py
@@ -1,5 +1,10 @@
-from typing import Any, Protocol
+import sys
+from typing import Any

+if sys.version_info < (3, 8):
+    from typing_extensions import Protocol
+else:
+    from typing import Protocol

 # Used internally by mypy_django_plugin.
 class AnyAttrAllowed(Protocol):
--- a/mypy.ini
+++ b/mypy.ini
@@ -9,6 +9,7 @@ warn_no_return = False
 warn_unused_ignores = True
 warn_redundant_casts = True
 warn_unused_configs = True
+warn_unreachable = True

 plugins =
    mypy_django_plugin.main
--- a/mypy_django_plugin/django/context.py
+++ b/mypy_django_plugin/django/context.py
@@ -35,6 +35,7 @@ except ImportError:
 if TYPE_CHECKING:
    from django.apps.registry import Apps  # noqa: F401
    from django.conf import LazySettings  # noqa: F401
+    from django.contrib.contenttypes.fields import GenericForeignKey


@contextmanager
@@ -100,9 +101,6 @@ class DjangoContext:
    @cached_property
    def model_modules(self) -> Dict[str, Set[Type[Model]]]:
        """All modules that contain Django models."""
-        if self.apps_registry is None:
-            return {}
-
        modules: Dict[str, Set[Type[Model]]] = defaultdict(set)
        for concrete_model_cls in self.apps_registry.get_models():
            modules[concrete_model_cls.__module__].add(concrete_model_cls)
@@ -327,7 +325,7 @@ class DjangoContext:
            related_model_cls = field.field.model

        if isinstance(related_model_cls, str):
-            if related_model_cls == "self":
+            if related_model_cls == "self":  # type: ignore[unreachable]
                # same model
                related_model_cls = field.model
            elif "." not in related_model_cls:
@@ -343,7 +341,7 @@ class DjangoContext:
        self, field_parts: Iterable[str], model_cls: Type[Model]
    ) -> Union[Field, ForeignObjectRel]:
        currently_observed_model = model_cls
-        field: Union[Field, ForeignObjectRel, None] = None
+        field: Union[Field, ForeignObjectRel, GenericForeignKey, None] = None
        for field_part in field_parts:
            if field_part == "pk":
                field = self.get_primary_key_field(currently_observed_model)
@@ -359,15 +357,16 @@ class DjangoContext:
            if isinstance(field, ForeignObjectRel):
                currently_observed_model = field.related_model

-        assert field is not None
+        # Guaranteed by `query.solve_lookup_type` before.
+        assert isinstance(field, (Field, ForeignObjectRel))
        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:
--- a/mypy_django_plugin/lib/fullnames.py
+++ b/mypy_django_plugin/lib/fullnames.py
@@ -35,6 +35,7 @@ RELATED_FIELDS_CLASSES = {FOREIGN_KEY_FULLNAME, ONETOONE_FIELD_FULLNAME, MANYTOM
 MIGRATION_CLASS_FULLNAME = "django.db.migrations.migration.Migration"
 OPTIONS_CLASS_FULLNAME = "django.db.models.options.Options"
 HTTPREQUEST_CLASS_FULLNAME = "django.http.request.HttpRequest"
+QUERYDICT_CLASS_FULLNAME = "django.http.request.QueryDict"

 COMBINABLE_EXPRESSION_FULLNAME = "django.db.models.expressions.Combinable"
 F_EXPRESSION_FULLNAME = "django.db.models.expressions.F"
--- a/mypy_django_plugin/main.py
+++ b/mypy_django_plugin/main.py
@@ -32,6 +32,7 @@ from mypy_django_plugin.transformers.models import (
    process_model_class,
    set_auth_user_model_boolean_fields,
 )
+from mypy_django_plugin.transformers.request import check_querydict_is_mutable


 def transform_model_class(ctx: ClassDefContext, django_context: DjangoContext) -> None:
@@ -187,12 +188,21 @@ class NewSemanalDjangoPlugin(Plugin):

    def get_method_hook(self, fullname: str) -> Optional[Callable[[MethodContext], MypyType]]:
        class_fullname, _, method_name = fullname.rpartition(".")
-        if method_name == "get_form_class":
+        # It is looked up very often, specialcase this method for minor speed up
+        if method_name == "__init_subclass__":
+            return None
+
+        if class_fullname.endswith("QueryDict"):
+            info = self._get_typeinfo_or_none(class_fullname)
+            if info and info.has_base(fullnames.QUERYDICT_CLASS_FULLNAME):
+                return partial(check_querydict_is_mutable, django_context=self.django_context)
+
+        elif method_name == "get_form_class":
            info = self._get_typeinfo_or_none(class_fullname)
            if info and info.has_base(fullnames.FORM_MIXIN_CLASS_FULLNAME):
                return forms.extract_proper_type_for_get_form_class

-        if method_name == "get_form":
+        elif method_name == "get_form":
            info = self._get_typeinfo_or_none(class_fullname)
            if info and info.has_base(fullnames.FORM_MIXIN_CLASS_FULLNAME):
                return forms.extract_proper_type_for_get_form
@@ -204,30 +214,30 @@ class NewSemanalDjangoPlugin(Plugin):
            if info and info.has_base(fullnames.QUERYSET_CLASS_FULLNAME) or class_fullname in manager_classes:
                return partial(querysets.extract_proper_type_queryset_values, django_context=self.django_context)

-        if method_name == "values_list":
+        elif method_name == "values_list":
            info = self._get_typeinfo_or_none(class_fullname)
            if info and info.has_base(fullnames.QUERYSET_CLASS_FULLNAME) or class_fullname in manager_classes:
                return partial(querysets.extract_proper_type_queryset_values_list, django_context=self.django_context)

-        if method_name == "annotate":
+        elif method_name == "annotate":
            info = self._get_typeinfo_or_none(class_fullname)
            if info and info.has_base(fullnames.QUERYSET_CLASS_FULLNAME) or class_fullname in manager_classes:
                return partial(querysets.extract_proper_type_queryset_annotate, django_context=self.django_context)

-        if method_name == "get_field":
+        elif method_name == "get_field":
            info = self._get_typeinfo_or_none(class_fullname)
            if info and info.has_base(fullnames.OPTIONS_CLASS_FULLNAME):
                return partial(meta.return_proper_field_type_from_get_field, django_context=self.django_context)

-        if class_fullname in manager_classes and method_name == "create":
+        elif 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"}:
+        elif class_fullname in manager_classes and method_name in {"filter", "get", "exclude"}:
            return partial(
                mypy_django_plugin.transformers.orm_lookups.typecheck_queryset_filter,
                django_context=self.django_context,
            )

-        if method_name == "from_queryset":
+        elif method_name == "from_queryset":
            info = self._get_typeinfo_or_none(class_fullname)
            if info and info.has_base(fullnames.BASE_MANAGER_CLASS_FULLNAME):
                return fail_if_manager_type_created_in_model_body
--- a/mypy_django_plugin/transformers/fields.py
+++ b/mypy_django_plugin/transformers/fields.py
@@ -1,4 +1,4 @@
-from typing import Optional, Tuple, Union, cast
+from typing import TYPE_CHECKING, Optional, Tuple, Union, cast

 from django.db.models.fields import AutoField, Field
 from django.db.models.fields.related import RelatedField
@@ -12,10 +12,13 @@ from mypy.types import TypeOfAny, UnionType
 from mypy_django_plugin.django.context import DjangoContext
 from mypy_django_plugin.lib import fullnames, helpers

+if TYPE_CHECKING:
+    from django.contrib.contenttypes.fields import GenericForeignKey
+

 def _get_current_field_from_assignment(
    ctx: FunctionContext, django_context: DjangoContext
-) -> Optional[Union[Field, ForeignObjectRel]]:
+) -> Optional[Union[Field, ForeignObjectRel, "GenericForeignKey"]]:
    outer_model_info = helpers.get_typechecker_api(ctx).scope.active_class()
    if outer_model_info is None or not helpers.is_model_subclass_info(outer_model_info, django_context):
        return None
--- a/mypy_django_plugin/transformers/managers.py
+++ b/mypy_django_plugin/transformers/managers.py
@@ -263,8 +263,6 @@ def create_new_manager_class_from_from_queryset_method(ctx: DynamicClassDefConte
                    semanal_api.defer()
                return None
            original_return_type = method_type.ret_type
-            if original_return_type is None:
-                continue

            # Skip any method that doesn't return _QS
            original_return_type = get_proper_type(original_return_type)
--- a/mypy_django_plugin/transformers/models.py
+++ b/mypy_django_plugin/transformers/models.py
@@ -15,7 +15,7 @@ from mypy.types import TypedDictType, TypeOfAny

 from mypy_django_plugin.django.context import DjangoContext
 from mypy_django_plugin.lib import fullnames, helpers
-from mypy_django_plugin.lib.fullnames import ANNOTATIONS_FULLNAME, ANY_ATTR_ALLOWED_CLASS_FULLNAME
+from mypy_django_plugin.lib.fullnames import ANNOTATIONS_FULLNAME, ANY_ATTR_ALLOWED_CLASS_FULLNAME, MODEL_CLASS_FULLNAME
 from mypy_django_plugin.lib.helpers import add_new_class_for_module
 from mypy_django_plugin.transformers import fields
 from mypy_django_plugin.transformers.fields import get_field_descriptor_types
@@ -475,8 +475,8 @@ def handle_annotated_type(ctx: AnalyzeTypeContext, django_context: DjangoContext
    type_arg = ctx.api.analyze_type(args[0])
    api = cast(SemanticAnalyzer, ctx.api.api)  # type: ignore

-    if not isinstance(type_arg, Instance):
-        return ctx.api.analyze_type(ctx.type)
+    if not isinstance(type_arg, Instance) or not type_arg.type.has_base(MODEL_CLASS_FULLNAME):
+        return type_arg

    fields_dict = None
    if len(args) > 1:
--- a/mypy_django_plugin/transformers/request.py
+++ b/mypy_django_plugin/transformers/request.py
@@ -1,7 +1,7 @@
-from mypy.plugin import AttributeContext
+from mypy.plugin import AttributeContext, MethodContext
 from mypy.types import Instance
 from mypy.types import Type as MypyType
-from mypy.types import UnionType
+from mypy.types import UninhabitedType, UnionType

 from mypy_django_plugin.django.context import DjangoContext
 from mypy_django_plugin.lib import helpers
@@ -35,3 +35,10 @@ def set_auth_user_model_as_type_for_request_user(ctx: AttributeContext, django_c
        return ctx.default_attr_type

    return UnionType([Instance(user_info, []), Instance(anonymous_user_info, [])])
+
+
+def check_querydict_is_mutable(ctx: MethodContext, django_context: DjangoContext) -> MypyType:
+    ret_type = ctx.default_return_type
+    if isinstance(ret_type, UninhabitedType):
+        ctx.api.fail("This QueryDict is immutable.", ctx.context)
+    return ret_type
--- a/tests/typecheck/test/test_client.yml
+++ b/tests/typecheck/test/test_client.yml
@@ -0,0 +1,33 @@
+-   case: client_methods
+    main: |
+      from django.test.client import Client
+      client = Client()
+      response = client.get('foo')
+      reveal_type(response.wsgi_request)  # N: Revealed type is "django.core.handlers.wsgi.WSGIRequest"
+      reveal_type(response.request)  # N: Revealed type is "builtins.dict[builtins.str, Any]"
+      reveal_type(response.templates)  # N: Revealed type is "builtins.list[django.template.base.Template]"
+      reveal_type(response.client)  # N: Revealed type is "django.test.client.Client"
+      reveal_type(response.context)  # N: Revealed type is "builtins.list[builtins.dict[builtins.str, Any]]"
+      response.json()
+-   case: async_client_methods
+    main: |
+      from django.test.client import AsyncClient
+      async def main():
+        client = AsyncClient()
+        response = await client.get('foo')
+        reveal_type(response.asgi_request)  # N: Revealed type is "django.core.handlers.asgi.ASGIRequest"
+        reveal_type(response.request)  # N: Revealed type is "builtins.dict[builtins.str, Any]"
+        reveal_type(response.templates)  # N: Revealed type is "builtins.list[django.template.base.Template]"
+        reveal_type(response.client)  # N: Revealed type is "django.test.client.AsyncClient"
+        reveal_type(response.context)  # N: Revealed type is "builtins.list[builtins.dict[builtins.str, Any]]"
+        response.json()
+-   case: request_factories
+    main: |
+      from django.test.client import RequestFactory, AsyncRequestFactory
+      factory = RequestFactory()
+      request = factory.get('foo')
+      reveal_type(request)  # N: Revealed type is "django.core.handlers.wsgi.WSGIRequest*"
+
+      async_factory = AsyncRequestFactory()
+      async_request = async_factory.get('foo')
+      reveal_type(async_request)  # N: Revealed type is "django.core.handlers.asgi.ASGIRequest*"
--- a/tests/typecheck/test/test_testcase.yml
+++ b/tests/typecheck/test/test_testcase.yml
@@ -9,4 +9,4 @@
              reveal_type(resp.status_code)   # N: Revealed type is "builtins.int"
              # Attributes monkey-patched by test Client class:
              resp.json()
-              reveal_type(resp.wsgi_request)  # N: Revealed type is "django.core.handlers.wsgi.WSGIRequest*"
+              reveal_type(resp.wsgi_request)  # N: Revealed type is "django.core.handlers.wsgi.WSGIRequest"
--- a/tests/typecheck/test_annotated.yml
+++ b/tests/typecheck/test_annotated.yml
@@ -0,0 +1,17 @@
+# Regression test for #893
+-   case: annotated_should_not_iterfere
+    main: |
+        from dataclasses import dataclass
+        import sys
+        if sys.version_info < (3, 9):
+            from typing_extensions import Annotated
+        else:
+            from typing import Annotated
+
+        class IntegerType:
+            def __init__(self, min_value: int, max_value: int) -> None:
+                pass
+
+        @dataclass(unsafe_hash=True)
+        class RatingComposite:
+            max_value: Annotated[int, IntegerType(min_value=1, max_value=10)] = 5
--- a/tests/typecheck/test_request.yml
+++ b/tests/typecheck/test_request.yml
@@ -69,3 +69,41 @@
        reveal_type(request.user) # N: Revealed type is "django.contrib.auth.models.User"
    custom_settings: |
        INSTALLED_APPS = ('django.contrib.contenttypes', 'django.contrib.auth')
+
+-   case: request_get_post
+    main: |
+        from django.http.request import HttpRequest
+
+        request = HttpRequest()
+        reveal_type(request)  # N: Revealed type is "django.http.request._MutableHttpRequest"
+        reveal_type(request.GET)  # N: Revealed type is "django.http.request.QueryDict"
+        request.GET['foo'] = 'bar'
+
+        def mk_request() -> HttpRequest:
+            return HttpRequest()
+
+        req = mk_request()
+        reveal_type(req)  # N: Revealed type is "django.http.request.HttpRequest"
+        reveal_type(req.GET)  # N: Revealed type is "django.http.request._ImmutableQueryDict"
+        req.GET.setdefault('foo', 'bar')  # E: This QueryDict is immutable.
+        x = 1  # E: Statement is unreachable
+
+# Will work after merging https://github.com/python/mypy/pull/12572
+-   case: request_get_post_unreachable
+    main: |
+        from django.http.request import HttpRequest
+
+        request = HttpRequest()
+        reveal_type(request)  # N: Revealed type is "django.http.request._MutableHttpRequest"
+        reveal_type(request.GET)  # N: Revealed type is "django.http.request.QueryDict"
+        request.GET['foo'] = 'bar'
+
+        def mk_request() -> HttpRequest:
+            return HttpRequest()
+
+        req = mk_request()
+        reveal_type(req)  # N: Revealed type is "django.http.request.HttpRequest"
+        reveal_type(req.GET)  # N: Revealed type is "django.http.request._ImmutableQueryDict"
+        req.GET['foo'] = 'bar'  # E: This QueryDict is immutable.
+        x = 1  # E: Statement is unreachable
+    expect_fail: true
--- a/tests/typecheck/views/generic/test_edit.yml
+++ b/tests/typecheck/views/generic/test_edit.yml
@@ -61,3 +61,34 @@

                class Article(models.Model):
                    pass
+
+-   case: generic_form_views_different_form_classes
+    main: |
+        from django.views.generic.edit import CreateView
+        from django import forms
+        from myapp.models import Article
+
+        class ArticleModelForm(forms.ModelForm[Article]):
+            class Meta:
+                model = Article
+        class SubArticleModelForm(ArticleModelForm):
+            pass
+        class AnotherArticleModelForm(forms.ModelForm[Article]):
+            class Meta:
+                model = Article
+
+        class MyCreateView(CreateView[Article, ArticleModelForm]):
+            def some(self) -> None:
+                reveal_type(self.get_form())  # N: Revealed type is "main.ArticleModelForm*"
+                reveal_type(self.get_form(SubArticleModelForm))  # N: Revealed type is "main.SubArticleModelForm"
+                reveal_type(self.get_form(AnotherArticleModelForm))  # N: Revealed type is "main.AnotherArticleModelForm"  # E: Argument 1 to "get_form" of "FormMixin" has incompatible type "Type[AnotherArticleModelForm]"; expected "Optional[Type[ArticleModelForm]]"
+    installed_apps:
+        - myapp
+    files:
+        -   path: myapp/__init__.py
+        -   path: myapp/models.py
+            content: |
+                from django.db import models
+
+                class Article(models.Model):
+                    pass