Broken when Custom groups in AbstractBaseUser

[VaZark]

Setup

The django project uses an AbstractBaseUser along with a Custom group for permissions.

class CustomGroup(Group):
    additional_field = models.CharField(max_length=10)
    ....

class CustomUser(AbstractBaseUser, PermissionsMixin):
    groups = models.ManyToManyField(CustomGroup)
    ....

Error / Unexpected Behaviour

When opening he django admin, we get the error Cannot query "AnonymousUser": Must be "Group" instance.

A little bit of googling gives me the impression that .has_perm() function invokes the Group class directly and does not update itself to reflect the custom group classes defined in the user model

Ideal Solution

Django guardian should detect the Group model associated with the user model and use it for perms. Or mention a workaround in the docs

[VaZark]

The initial migration runs a foreign key to the Group model under auth automatically.

('group', models.ForeignKey(to='auth.Group', on_delete=models.CASCADE)), in 0001_initial.py

Can the string made into a swappable dependency or set by using a custom variable in settings ??

[michael-k]

See #504