Re: Field that's unique across several tables

On Oct 14, 2:26 pm, Aaron <aa...@genieknows.com> wrote:
> I have a bunch of models that each have a field X. I want this X to be
> unique not just within a particular model (table) but unique across
> several models. So, a model of type A can't have a value for its X if
> that value is already in the X of a model of type B.
>
> I get the impression that I'd have to either subclass a model field or
> a form field. A model field seems more appropriate, but I can't find
> its equivalent of the form field's clean() method where it seems most
> appropriate to do the uniqueness checks.

A better way might be to use model inheritance (multitable). The
parent model would just include the field you want to be unique, and
the subclassed models would include their own fields. You should be
able to set unique=True on that one field in the parent model, and it
should work.
--
DR.
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