enable 'model_forms' for tests typechecking (#270)

django-stubs/forms/fields.pyi

@@ -205,10 +205,9 @@ class CallableChoiceIterator:
     def __iter__(self) -> None: ...
 
 class ChoiceField(Field):
-    choices: Any = ...
     def __init__(
         self,
-        choices: Any = ...,
+        choices: _FieldChoices = ...,
         required: bool = ...,
         widget: Optional[Union[Widget, Type[Widget]]] = ...,
         label: Optional[Any] = ...,

django-stubs/forms/models.pyi

@@ -1,5 +1,21 @@
 from datetime import datetime
-from typing import Any, Callable, Dict, Iterator, List, Mapping, MutableMapping, Optional, Sequence, Tuple, Type, Union
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    Iterator,
+    List,
+    Mapping,
+    MutableMapping,
+    Optional,
+    Sequence,
+    Tuple,
+    Type,
+    Union,
+    ClassVar,
+    Container,
+    TypeVar,
+)
 from unittest.mock import MagicMock
 from uuid import UUID
 
@@ -24,6 +40,11 @@ _Fields = Union[List[Union[Callable, str]], Sequence[str], Literal["__all__"]]
 _Labels = Dict[str, str]
 _ErrorMessages = Dict[str, Dict[str, str]]
 
+_M = TypeVar("_M", bound=Model)
+
+def construct_instance(
+    form: BaseForm, instance: _M, fields: Optional[Container[str]] = ..., exclude: Optional[Container[str]] = ...
+) -> _M: ...
 def model_to_dict(
     instance: Model, fields: Optional[_Fields] = ..., exclude: Optional[_Fields] = ...
 ) -> Dict[str, Any]: ...
@@ -76,7 +97,8 @@ class BaseModelForm(BaseForm):
     save_m2m: Any = ...
     def save(self, commit: bool = ...) -> Any: ...
 
-class ModelForm(BaseModelForm): ...
+class ModelForm(BaseModelForm, metaclass=ModelFormMetaclass):
+    base_fields: ClassVar[Dict[str, Field]] = ...
 
 def modelform_factory(
     model: Type[Model],

django-stubs/views/generic/edit.pyi

@@ -1,11 +1,12 @@
 from typing import Any, Callable, Dict, Optional, Sequence, Type, Union
 
 from django.forms.forms import BaseForm
-from django.http import HttpRequest, HttpResponse
 from django.views.generic.base import ContextMixin, TemplateResponseMixin, View
 from django.views.generic.detail import BaseDetailView, SingleObjectMixin, SingleObjectTemplateResponseMixin
 from typing_extensions import Literal
 
+from django.http import HttpRequest, HttpResponse
+
 class FormMixin(ContextMixin):
     initial: Dict[str, Any] = ...
     form_class: Optional[Type[BaseForm]] = ...

scripts/enabled_test_modules.py

@@ -3,7 +3,7 @@
 import re
 
 IGNORED_MODULES = {'schema', 'gis_tests', 'admin_widgets', 'admin_filters',
-                   'sitemaps_tests', 'staticfiles_tests', 'modeladmin', 'model_forms',
+                   'sitemaps_tests', 'staticfiles_tests', 'modeladmin',
                    'generic_views', 'forms_tests', 'flatpages_tests',
                    'admin_ordering', 'admin_changelist', 'admin_views',
                    'invalid_models_tests', 'i18n', 'model_formsets',
@@ -283,6 +283,14 @@ IGNORED_ERRORS = {
         'Incompatible type for "size" of "FloatModel" (got "object", expected "Union[float, int, str, Combinable]")',
         'Incompatible type for "value" of "IntegerModel" (got "object", expected',
     ],
+    'model_forms': [
+        '"render" of "Widget"',
+        "Module 'django.core.validators' has no attribute 'ValidationError'",
+        'Incompatible types in assignment',
+        'NewForm',
+        '"type" has no attribute "base_fields"',
+        'Argument "instance" to "InvalidModelForm" has incompatible type "Type[Category]"',
+    ],
     'model_indexes': [
         'Argument "condition" to "Index" has incompatible type "str"; expected "Optional[Q]"'
     ],

scripts/typecheck_tests.py

@@ -14,8 +14,8 @@ from scripts.enabled_test_modules import (
 )
 
 DJANGO_COMMIT_REFS: Dict[str, Tuple[str, str]] = {
-    '2.2': ('stable/2.2.x', 'e8b0903976077b951795938b260211214ed7fe41'),
-    '3.0': ('stable/3.0.x', '7ec5962638144cbf4c2e47ea7d8dc02d1ce44394')
+    '2.2': ('stable/2.2.x', '86befcc172c23170a720b3e0c06db51a99b3da59'),
+    '3.0': ('stable/3.0.x', '6cb30414bc0f83b49afc4cae76d4af5656effe9a')
 }
 PROJECT_DIRECTORY = Path(__file__).parent.parent
 DJANGO_SOURCE_DIRECTORY = PROJECT_DIRECTORY / 'django-sources'  # type: Path