On 5-7-2012 21:46, Fabiano Martins wrote: > I'm novice on Django, and I have a problem that I can't resolve through > documentation. > > I like to make a validation on Model.clear() of the master class method based > on > data of your detail classes, but it returns always a empty set. > > This example illustrates my problem:
> def clean(self): > super(Master, self).clean() > total = 0 > for product in self.product_set.all(): > total += product.value At clean() time nothing has been saved, so the relationship isn't there yet and you can't ask for it. There are a few ways to solve it in decreasing order: - Use a custom template and write some javascript that calculates the master value on submit. - Write a custom view and calculate the totals there. - Wrap everything in a transaction, do the validation in the post_save signal and roll back the transaction if the total is too low (not even sure this /can/ be done). Maybe others have more ideas. -- Melvyn Sopacua -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
