Multiple Profiles for Internal/External Users

accounts-models.py

from django.db import models
from django.contrib.auth import User
from mycompany.models import Client
from userprofiles.models import Profile

class External(Profile):
    #External-specific models
    client = models.ForeignKey(Client)

    def __unicode__(self):
        return "%s" % self.user.get_full_name()

mycompany-models.py

from django.db import models
from django.contrib.auth import User
from userprofiles.models import Profile

class Associate(Profile):
    #Associate-specific fields
    employeeid = models.PositiveIntegerField(editable=False)

    def __unicode__(self):
        return "%s" % self.user.get_full_name()

class Client(models.Model):
    name = models.CharField(max_length=75)

    def __unicode__(self):
        return "%s" % self.name

userprofiles-models.py

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

USER_TYPES = {
    ('INT', _('Internal')),
    ('EXT', _('External')),
}

class Profile(models.Model):
    user = models.OneToOneField(User, unique=True)
    #Other Basic Fields
    about = models.TextField()
    user_type = models.CharField(max_length=3, choices=USER_TYPES, default='INT')

    def __unicode__(self):
        return "%s" % self.user.get_full_name()

userprofiles-signals.py

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

def create_profile(sender, **kw):
    user = kw["instance"]
    if kw["created"]:
        profile = Profile(user=user)
        profile.save()

post_save.connect(create_profile, sender=User, dispatch_uid="user-profile-signal")