TypeError: type 'GenericViewSet' is not subscriptable

[Alfro]

Bug report

What's wrong

On the following code:

from rest_framework import mixins, viewsets

class MyModelListViewSet(mixins.ListModelMixin, viewsets.GenericViewSet): ...

I am getting the following error:

error: Missing type parameters for generic type "GenericViewSet" [type-arg]

because I'm not adding a [Type] to GenericViewSet. However, if I do it like so:

from rest_framework import mixins, viewsets

class MyModelListViewSet(mixins.ListModelMixin, viewsets.GenericViewSet[MyModel]): ...

I will get a "not subscriptable" error on execution like so:

TypeError: type 'GenericViewSet' is not subscriptable

How is that should be

The DRF GenericViewSet and its type definition should be compatible. If the viewset is not subscriptable, the stubs should not require a type.

System information

• OS:
• python version: 3.11.11
• django version: 5.1.6
• djangorestframework version: 3.14.0
• djangorestframework-stubs version: 3.14.5
• mypy version: 1.11.1
• django-stubs version: 4.2.7

Is this a version incompatibility issue? I've tried to see if newer versions of djangorestframework have a subscriptable ViewSet.

Please do let me know what I'm doing wrong and feel free to retag this if needed. Since the GenericViewSet definition has been like this for a long time, I have a feeling I must just be misunderstanding something.