Model validation is ticket #6845 , and is considered a 1.0 beta maybe-
feature.  I believe Honza's latest patch is just about complete,
perhaps you could test it out, I believe it has docs.

On Jul 22, 10:36 am, "Alex Rades" <[EMAIL PROTECTED]> wrote:
> Hi,
> sorry for posting this here, but this deals with some design decision
> taken which I don't understand (and I couldn't understand from
> discussion on -users)
>
> I have a couple of models like:
>
> class User(model.Model):
>     group = models.ForeignKey(Group)
>
> Class Group(model.Model):
>     interest = models.ForeignKey(Interests)
>
> Basically i want to be possible to change the interest field of a
> Group *only if*:
>
> self.user_set.count() == 0
>
> The current documentation talks about validator_list, which doesn't
> seem to be working at the moment.
>
> So, I need to perform custom validation on a specific field. Doing it
> into the save() method of the model is not suitable (I want to raise
> an error which is specific to the field and, for example in the admin,
> is displayed next to the field itself.
>
> Is there a way to do this?
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