I am not sure if you are trying to get the Group model or just Groups in the User model.
To add Group in Admin you can do like this in admin.py
file:
from django.contrib import admin
from django.contrib.auth import get_user_model
from django.contrib.auth.models import Group
User = get_user_model()
admin.site.register(User)
admin.site.register(Group)
Or if you just want to add extra properties in User
you can do like this in your UserAdmin
class:
fieldsets = (
# ...
('Permissions', {'fields': ('groups', 'user_permissions')}),
)
and Update admin.site.register(User)
line with
admin.site.register(User, UserAdmin)