Dmitry Mikhaylov Dmitry Mikhaylov - 7 months ago 36
Python Question

InvalidBasesError: Cannot resolve bases for [<ModelState: 'users.GroupProxy'>]

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

django.db.migrations.state.InvalidBasesError: Cannot resolve bases for [<ModelState: 'users.GroupProxy'>]
This can happen if you are inheriting models from an app with migrations (e.g. contrib.auth)

I created this proxy for contrib.auth Group model to place it in my app in django admin:

class GroupProxy(Group):
class Meta:
proxy = True
verbose_name = Group._meta.verbose_name
verbose_name_plural = Group._meta.verbose_name_plural

So what can I do to fix this issue?


After a lot of digging on this the only thing that worked for me was

comment out the offending apps, run migrations, then add them in again.

Just a workaround but hopefully it helps somebody.