Is it possible to force a base model to have a sub model? Consider the
following model...
class Account(models.Model):
user = models.ForeignKey('auth.User')
name = models.CharField(max_length=100)
description = models.CharField(max_length=35, blank=True)
date_added = models.DateField(auto_now_add=True, blank=True)
class CheckingAccount(Account):
routing_number = models.IntegerField(max_length=9)
account_number = models.IntegerField(max_length=15)
class CreditCardAccount(Account):
type = models.CharField(max_length=1)
number = models.IntegerField(max_length=16)
exp = models.CharField(max_length=5)
class Payment(models.Model):
account = models.ForeignKey(Account)
date_billed = models.DateField()
date_paid = models.DateField(blank=True)
amount = models.DecimalField(max_digits=10, decimal_places=2)
I want to require that the Payment model have an Account. That works
fine, but I want that account to either be a CreditCardAccount or
CheckingAccount. Right now in the admin interface when I view the
Payment form I get the opportunity to add an Account. That is fine but
it means nothing without a relationship with CreditCardAccount or
CheckingAccount.
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