#17871: Broken: GenericInlineModelAdmin and two ForeignKey -------------------------------+-------------------- Reporter: danny.adair@… | Owner: nobody Type: Bug | Status: new Component: contrib.admin | Version: 1.3 Severity: Normal | Keywords: Triage Stage: Unreviewed | Has patch: 0 Easy pickings: 1 | UI/UX: 0 -------------------------------+-------------------- A scenario that I would not call exotic at all:
models.py {{{ from django.contrib.contenttypes import generic from django.contrib.contenttypes.models import ContentType from django.db import models class Whatever(models.Model): something = models.CharField(max_length=254) class Person(models.Model): name = models.CharField(max_length=254) class Action(models.Model): content_type = models.ForeignKey(ContentType) object_id = models.PositiveIntegerField() content_object = generic.GenericForeignKey('content_type', 'object_id') task = models.CharField(max_length=254) accountable = models.ForeignKey(Person, related_name='actions_accountable_for', null=True, blank=True) assigned_to = models.ForeignKey(Person, related_name='actions_assigned_to', null=True, blank=True) due_date = models.DateField(null=True, blank=True) completed_date = models.DateField(null=True, blank=True) }}} So I want to attach an "Action" (something that needs to be done) to various other things (generic relation), and it has a Person being accountable and a Person that's assigned to it. They have a different related_name so all good. admin.py {{{ from django.contrib import admin from django.contrib.contenttypes.generic import GenericStackedInline from models import Action, Whatever class ActionInline(GenericStackedInline): model = Action class WhateverAdmin(admin.ModelAdmin): inlines = [ActionInline] admin.site.register(Whatever, WhateverAdmin) }}} That throws the exception {{{ <class 'myproject.myapp.models.Action'> has more than 1 ForeignKey to <class 'myproject.myapp.models.Person'> }}} This happens in admin.validation.validate_inline() triggered by "admin.site.register(Whatever, !WhateverAdmin)". I don't get it. The related_name are different, and the foreign key for the inline is a !GenericForeignKey. I thought maybe I just have to satisfy that (buggy?) validation and set 'fk_name' in !ActionInline to one of the two (as the !GenericStackedInline won't be using it anyway). But then I get: {{{ fk_name 'accountable' is not a ForeignKey to <class 'myproject.myapp.models.Whatever'> }}} Sure it's not. But it's not the relevant foreign key for this inline - the generic foreign key is. Is this a bug? How can I get around this? P.S.: The documentation states I can use a !GenericInlineModelAdmin https://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#generic- relations-in-forms-and-admin It also says that if an inline has two !ForeignKeys to the same model, "fk_name" needs to be specified https://docs.djangoproject.com/en/dev/ref/contrib/admin/#working-with-a -model-with-two-or-more-foreign-keys-to-the-same-parent-model That seems to assume that the two !ForeignKeys are used in the inline for that foreign model. What's also freaky is that with settings.DEBUG=True the Exception is thrown but with DEBUG=False the change_form is rendered without complaints (and seemingly working). -- Ticket URL: <https://code.djangoproject.com/ticket/17871> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To post to this group, send email to django-updates@googlegroups.com. To unsubscribe from this group, send email to django-updates+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-updates?hl=en.