add proper stubs for django.contrib.auth.models model fields (#170)

django-stubs/contrib/auth/base_user.pyi

@@ -13,14 +13,12 @@ class BaseUserManager(models.Manager[_T]):
     def get_by_natural_key(self, username: Optional[str]) -> _T: ...
 
 class AbstractBaseUser(models.Model):
-    password: models.CharField = ...
-    last_login: models.DateTimeField = ...
-    is_active: models.BooleanField = ...
+    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 clean(self) -> None: ...
-    def save(self, *args: Any, **kwargs: Any) -> None: ...
     def natural_key(self) -> Tuple[str]: ...
     @property
     def is_anonymous(self) -> bool: ...

django-stubs/contrib/auth/models.pyi

@@ -15,17 +15,17 @@ class PermissionManager(models.Manager):
 
 class Permission(models.Model):
     content_type_id: int
-    name: models.CharField = ...
-    content_type: models.ForeignKey = models.ForeignKey(ContentType, on_delete=models.CASCADE)
-    codename: models.CharField = ...
+    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):
     def get_by_natural_key(self, name: str) -> Group: ...
 
 class Group(models.Model):
-    name: models.CharField = ...
-    permissions: models.ManyToManyField = models.ManyToManyField(Permission)
+    name = models.CharField(max_length=150)
+    permissions = models.ManyToManyField(Permission)
     def natural_key(self): ...
 
 _T = TypeVar("_T", bound=Model)
@@ -39,7 +39,7 @@ class UserManager(BaseUserManager[_T]):
     ) -> _T: ...
 
 class PermissionsMixin(models.Model):
-    is_superuser: models.BooleanField = ...
+    is_superuser = models.BooleanField()
     groups: models.ManyToManyField = models.ManyToManyField(Group)
     user_permissions: models.ManyToManyField = models.ManyToManyField(Permission)
     def get_group_permissions(self, obj: None = ...) -> Set[str]: ...
@@ -50,15 +50,17 @@ class PermissionsMixin(models.Model):
 
 class AbstractUser(AbstractBaseUser, PermissionsMixin):  # type: ignore
     username_validator: UnicodeUsernameValidator = ...
-    username: models.CharField = ...
-    first_name: models.CharField = ...
-    last_name: models.CharField = ...
-    email: models.EmailField = ...
-    is_staff: models.BooleanField = ...
-    date_joined: models.DateTimeField = ...
+
+    username = models.CharField(max_length=150)
+    first_name = models.CharField(max_length=30, blank=True)
+    last_name = models.CharField(max_length=150, blank=True)
+    email = models.EmailField(blank=True)
+    is_staff = models.BooleanField()
+    is_active = models.BooleanField()
+    date_joined = models.DateTimeField()
+
     EMAIL_FIELD: str = ...
     USERNAME_FIELD: str = ...
-    def clean(self) -> None: ...
     def get_full_name(self) -> str: ...
     def get_short_name(self) -> str: ...
     def email_user(self, subject: str, message: str, from_email: str = ..., **kwargs: Any) -> None: ...

test-data/typecheck/models/test_contrib_models.yml

@@ -0,0 +1,22 @@
+-   case: contrib_auth_model_fields
+    main: |
+        from django.contrib.auth.models import User
+        reveal_type(User().username)  # N: Revealed type is 'builtins.str*'
+        reveal_type(User().password)  # N: Revealed type is 'builtins.str*'
+        reveal_type(User().first_name)  # N: Revealed type is 'builtins.str*'
+        reveal_type(User().last_name)  # N: Revealed type is 'builtins.str*'
+        reveal_type(User().email)  # N: Revealed type is 'builtins.str*'
+        reveal_type(User().is_staff)  # N: Revealed type is 'builtins.bool*'
+        reveal_type(User().is_active)  # N: Revealed type is 'builtins.bool*'
+        reveal_type(User().date_joined)  # N: Revealed type is 'datetime.datetime*'
+        reveal_type(User().last_login)  # N: Revealed type is 'Union[datetime.datetime, None]'
+
+        from django.contrib.auth.models import Permission
+        reveal_type(Permission().name)  # N: Revealed type is 'builtins.str*'
+        reveal_type(Permission().codename)  # N: Revealed type is 'builtins.str*'
+
+        from django.contrib.auth.models import PermissionsMixin
+        reveal_type(PermissionsMixin().is_superuser)  # N: Revealed type is 'builtins.bool*'
+
+        from django.contrib.auth.models import Group
+        reveal_type(Group().name)  # N: Revealed type is 'builtins.str*'