def type(self):
if self.amount.amount < 0:
return DEBIT
elif self.amount.amount > 0:
return CREDIT
else:
# This should have been caught earlier by the database integrity check.
# If you are seeing this then something is wrong with your DB checks.
raise exceptions.ZeroAmountError()
def save(self, *args, **kwargs):
if self.amount.amount == 0:
raise exceptions.ZeroAmountError()
return super(Leg, self).save(*args, **kwargs)