Let's say I have two classes:
class Account(models.Model):
...
current_balance = models.DecimalField(max_digits=12,
decimal_places=2)
...
class Transaction(models.Model):
...
account = models.ForeignKey(Account)
amount = models.DecimalField(max_digits=12, decimal_places=2)
...
When a new transaction is entered, I would like to add the Transaction
amount to the current_balance of the related Account.
So I tried to define a save method:
class Transaction(models.Model):
...
def save(self):
self.account.current_balance = self.account.current_balance +
self.amount
super(Transaction, self).save()
This does not work. How do I access the 'current_balance' property of
the related 'Account' instance? Is there a better way to do this?
thanks in advance,
-cjl
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