"Did you know about mutation? :-)" I was expecting this one!
Well thanks a lot!!
2007/1/10, Ivan Sagalaev <[EMAIL PROTECTED]>:
>
>
> Sebastien Armand [Pink] wrote:
> > class Person(models.Model):
> > ...
> > mother = models.ForeignKey('Person')
> > ...
> >
> > Will this work?
>
> Use models.ForeignKey('self')
>
> > For example if I've got a Body class and a Legs class, I know that I'll
> > never have a body with more than 2 legs
>
> Did you know about mutation? :-)
>
> > and it would be easier to have a
> > leftLeg = ForeignKey(Leg) field
> > and a
> > rightLeg = ForeignKey(Leg) field
> >
> > but this causes many errors when I try to validate my model.
>
> Upon seeing a ForeignKey Django tries to create backward accessors from
> the parent model to children. In your case it should be "Leg.body_set"
> that will fetch all Legs with a ForeignKey to a particular Body.
>
> However since you have two ForeignKeys to the same model Django needs to
> have two such relations: all bodies for a LeftLeg and all bodies for a
> RightLeg. The only problem that it doesn't know how to _name_ these
> relations. It certainly can't have two different "body_set"s on a Leg.
> So the only thing that it asks you is to choose two names for the
> relations:
>
> leftLeg = models.ForeignKey(Leg, related_name='bodies_if_left')
> rightLeg = models.ForeignKey(Leg, related_name='bodies_if_right')
>
> My naming skills are known to be lousy so choose your own according to
> what these things really mean.
>
> >
>
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