InvalidBasesError: Cannot resolve bases for []

Question

When I run tests I get this error during database initialization:

django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [

        

Answer 1

I've come across this issue, and as commenting out the model isn't really a solution, I've found that setting the undocumented auto_created = True to the Meta class will make Django ignore it.

class GroupProxy(Group):

    class Meta:
        proxy = True
        auto_created = True

Answer 2

I faced the same issue and adding app_label attribute in class Meta: solved the error :

class GroupProxy(Group):
    class Meta:
        proxy = True
        app_label = '<app in which you want this model>'
        verbose_name = Group._meta.verbose_name
        verbose_name_plural = Group._meta.verbose_name_plural