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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