On Sep 2, 2015 9:51 AM, "jeff newburn" <jef...@gmail.com> wrote:
>
> I apologize if this is basic and I am just missing something in the
django docs. The Django ORM allows you to do a self reference through
another table. I understand everything about this process EXCEPT how
Django determines which of the foreign keys to use for each side of the M2M
relationship.
>
> class MyUser(...):
> connections = models.ManyToManyField('self', through=Relationship,
symmetrical=False)
>
> class Relationship(...):
> follower = models.ForeignKey(MyUser)
> following = models.ForeignKey(MyUser)
>
> So in the psuedocode example above how does Django ORM know which of the
2 foreign key fields to connect to? Does it just assume the first field is
the one to use? Thanks for any help on this.
>
When you have multiple references to the same model, you have to do a bit
of extra work to tell Django how you want things to line up. I think what
you need to do is specify the 'through_fields' on the M2M, and set
appropriate 'related_name' arguments for the FK's.
https://docs.djangoproject.com/en/1.8/ref/models/fields/#django.db.models.ManyToManyField.through_fields
-James
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