On Fri, Jul 17, 2009 at 6:55 AM, Oleg Oltar<oltarase...@gmail.com> wrote:
> I want to create an object that contains 2 links to users. For example > > class GameClaim(models.Model): > target = models.ForeignKey(User) > claimer = models.ForeignKey(User) > isAccepted = models.BooleanField() > > but I am getting an error when running server: > > Accessor for field 'target' clashes with related field 'User.gameclaim_set'. > Add a related_name argument to the definition for 'target'. > Accessor for field 'claimer' clashes with related field > 'User.gameclaim_set'. Add a related_name argument to the definition for > 'claimer'. > > Please explain why I am getting the error and how to fix it? When you create a relationship from model A (GameClaim) to model B (User), Django automatically adds to model B isntances Python attribute (the ' accessors' above) that allow you to in case you have one B instance, to get all the A instances related to it (in your example, using the claimer FK, it would allow you to, starting from an given user, obtain all the games she/he claimed). The name of such an accessor is, by default, determined by a simple rule: the A name lowercased and suffixed with '_set' (gameclaim_set). The problem in your case is a typical one and the model validation error messages you are getting are pointing you in the right direction: you have two FKs between A and B and then the default names for the accessors Django is trying to add clash. Is In those cases when the related_name parameter of the ForeignKey field is useful because it allows you to override the default accessor name 'gameclaim_set'. Read the relevant documentation for more details: http://docs.djangoproject.com/en/dev/ref/models/fields/#foreignkey http://docs.djangoproject.com/en/dev/topics/db/queries/#backwards-related-objects HTH. -- Ramiro Morales http://rmorales.net PyCon 2009 Argentina - Vie 4 y Sab 5 Septiembre Buenos Aires, Argentina http://ar.pycon.org/2009/about/ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
