chrisglass/django_polymorphic — pull request #3 by mbrochh (2011-12-09 07:45:45+00:00)
Title: Not using attrs when getting the first user defined manager.

When I tried to create a custom manager for a polymorphic model (actually a model that extends django-shop's Product model), I faced this error message when sending a request to the server:

TypeError at /
Error when calling the metaclass bases
issubclass() arg 2 must be a class or tuple of classes

This one gave me around 20 hours of major pain in the brain. Comments will follow in the code.