class UserManager(BaseUserManager):
	use_in_migrations = True
	def _create_user(self, email, password, **extra_fields):

	if not email:
		raise ValueError('The given email must be set')
	email = self.normalize_email(email)	
	user = self.model(email=email, **extra_fields)
	user.set_password(password)
	user.save(using=self._db)
	return user
	def create_user(self, email, password=None, **extra_fields):
		extra_fields.setdefault('is_superuser', False)
		return self._create_user(email, password, **extra_fields)
	def create_superuser(self, email, password, **extra_fields):
	extra_fields.setdefault('is_superuser', True)
	if extra_fields.get('is_superuser') is not True:
		raise ValueError('Superuser must have is_superuser=True.')
	return self._create_user(email, password, **extra_fields)
class UserProfile(models.Model):
	avatar = models.URLField()
	user = models.ForeignKey(User, unique=True)
	objects = UserManager()
	@receiver(post_save, sender=User)
	def create_user_profile(sender, **kwargs):
		#When creating a new user, make a profile for him or her.
		u = kwargs["instance"]
		if not UserProfile.objects.filter
		UserProfile(user=u).save()