I extend the django user model as described in the dev doc. I wan't to keep most of the original User model features so I extend the AbstractUser class. I've defined in settings.py:

AUTH_USER_MODEL = 'myapp.CustomUser'

My user class:

class CustomUser(AbstractUser):
  custom_field = models.ForeignKey('OtherModel')
  objects = UserManager()

Everything seems to work fine but when I try to make it managed by the admin site:

admin.site.register(CustomUser, UserAdmin)

I get this error on the admin CustomUser creation page (after validation of the password confirmation form):

AttributeError: Manager isn't available; User has been swapped for 'myapp.CustomUser'

The point is that I need this model managed by the admin site in order to have the same creation process as with the original User model (two step process with password validation).

Thanks for any reply