Django unique_together on sub-class model for parent attribute?

Question

In this:

class Administrator(models.Model):
    user = models.OneToOneField(User, primary_key=True)
    account = models.ForeignKey(Account)

    class Meta:
            


        

Answer 1

It would be

unique_together = (('account', 'user__username'),)

if I understand what you're trying to do. Note the double underscore. That's how you look at a foreign key's object's properties.

Answer 2

What you are missing is abstract = True in the base class. This creates a table with all the fields for the subclass.

Answer 3

I don't believe you can do what you're trying to do using django core. As pointed out in this answer to a related question unique_together is enforced at the DB layer. If you inspect the DB tables created by django model inheritance, you'll see this isn't possible for the DB to accomplish.

Take a look at that related question for some alternative solutions.