Validation turns out to be well-nigh impossible using parent / child
aliases, but pretty easy with parent / child accounts. Here's what
I've ended up with:
class Account(models.Model):
user = models.ForeignKey(User, unique=True, null=True, blank=True)
alias = models.CharField(max_length=32, unique=True)
parent_account = models.ForeignKey('self', related_name='children',
null=True, blank=True)
def __unicode__(self):
return '%s owned by %s' % (self.alias, self.get_owner())
def save(self, force_insert=False, force_update=False):
if not Account.is_valid_parent_or_child(self.user,
self.parent_account):
raise AccountInheritanceError
super(Account, self).save(force_insert, force_update)
def get_canonical_alias(self):
if self.is_child():
return self.parent_account.get_canonical_alias()
return self.alias
def get_owner(self):
if self.is_child():
return self.parent_account.get_owner()
return self.user
@staticmethod
def is_valid_parent_or_child(user, parent_account):
# We need either a user (meaning this is a primary account)
# or a parent (meaning this is a child account), but not both
if bool(user) == bool(parent_account):
return False
if parent_account.is_child():
return False
return True
def is_parent(self):
return bool(self.user)
def is_child(self):
return bool(self.parent_account)
I'll probably end up shunting any required account fields into a
Profile model and either a)attaching that to Account with a nullable
one-to-one relationship, and making that required for parent accounts;
or b) making the Profile model the AUTH_PROFILE_MODULE rather than
Account (which is currently).
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