Does Field.unique address your needs? ManyToOne may be the better
solution...but without models to look at, it may require a validity check
at save to confirm that each Pizza only had one of each type of Topping.

Cheers
L.

On Thu, Jan 17, 2013 at 10:46 AM, acat...@gmail.com <acat...@gmail.com>wrote:

> I'm trying to setup a relationship between two django models that is very
> similar to the model of a Pizza having many Toppings.  However, I need to
> make sure that if a Pizza is created then only one Pepperoni topping can be
> added.  The pizza could have the olive topping and onion topping, etc.  But
> only one of each.  Thanks for any help.
>



-- 
...we look at the present day through a rear-view mirror. This is something
Marshall McLuhan said back in the Sixties, when the world was in the grip
of authentic-seeming future narratives. He said, “We look at the present
through a rear-view mirror. We march backwards into the future.”

http://www.warrenellis.com/?p=14314

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