[Django]-Django user profile database problem

http://docs.djangoproject.com/en/dev/topics/auth/#storing-additional-information-about-users

The method get_profile() does not
create the profile, if it does not
exist. You need to register a handler
for the signal
django.db.models.signals.post_save on
the User model, and, in the handler,
if created=True, create the associated
user profile.

The signal they mention is not really documented django-style where they provide code examples, so I will create an example for you:

from django.db.models import signals
from django.contrib.auth.models import User

def create_userprofile(sender, **kwargs):
    created = kwargs['created'] # object created or just saved?

    if created:
        BBB.objects.create(user=kwargs['instance'])  # instance is the user
        # create a BBB "profile" for your user upon creation.
        # now every time a user is created, a BBB profile will exist too.
        # user.BBB or user.get_profile() will always return something

signals.post_save.connect(create_userprofile, sender=User)