Possible issue when using django-polymorphic along with typeddjango

[AntoineRondelet]

Hi, this ticket is echoes typeddjango/django-stubs#1158 which I opened earlier today on the typeddjango repo.

In short and as explained there, mypy (I'm using the django stubs) started to complain when I started to use django-polymorphic. Mypy complained that it couldn't resolve the manager type in classes inheriting from the polymorphic model.

Do I need to do something specific to get this to work well with mypy? I tried to change base_manager_name in the child classes to try to use a non_polymorphic manager but that didn't solve my issue.

I'm raising this ticket in this repo in case this issue comes from here and not from the typeddjango project. I might also have done something wrong. I'd welcome feedback if any.

Thanks in advance!