Issue: FactoryMetaClass does not define __getitem__

[Tsdevendra1]

I'm not sure if I'm using this wrong but when I define a factory such as:

class UserFactory(factory.django.DjangoModelFactory[User]):
    class Meta:
        model = User

I get the following error:

Class 'FactoryMetaClass' does not define '__getitem__', so the '[]' operator cannot be used on its instances

I understand why the error occurs, but I'm not sure what the intended solution is. Since DjangoModelFactory is generic in the stubs, what's the intended usage if DjangoModelFactory isn't actually able to support getitem? Should I monkeypatch FactoryMetaClass?

[axieum]

If you're also using typeddjango/django-stubs, a workaround is to piggy-back off of their monkey-patching:

import django_stubs_ext
import factory

# Monkeypatching Django, so stubs will work for all generics, see: https://github.com/typeddjango/django-stubs
django_stubs_ext.monkeypatch(
  extra_classes=[
    # https://github.com/youtux/types-factory-boy/issues/53
    factory.base.BaseFactory,
    factory.declarations.BaseDeclaration,
    factory.declarations.Trait,
    # ...
  ]
)

[youtux]

yeah it looks like this is quite a big limitation, until the upstream (django) will fix their classes to be typed and generic