[Django] #21705: Generic Relations fail to detect validation error appropritely

[Django]

#21705: Generic Relations fail to detect validation error appropritely
-------------------------+-------------------------------------------------
     Reporter:           |      Owner:  nobody
  mo_ttds@…              |     Status:  new
         Type:  Bug      |    Version:  1.6
    Component:           |   Keywords:  AdminSite, GenericRelation,
  contrib.admin          |  unique_together, IntegrityError
     Severity:  Normal   |  Has patch:  0
 Triage Stage:           |      UI/UX:  0
  Unreviewed             |
Easy pickings:  0        |
-------------------------+-------------------------------------------------
 Hi. When using a GenericRelation on a Model to create a M2M generic
 relation between two other models, with a '''unique_together''' attribute
 on the relation. admin site fails to detect '''uniqueness-validation'''
 and instead of reporting a unique violation validation error it raises an
 '''IntegrityError''' e.g. IntegrityError: columns tag_id, object_id are
 not unique

 here is the case:
 {{{
 class Tag(models.Model):
     slug = models.SlugField(max_length=100)

     def __unicode__(self):
         return self.slug

 class News(models.Model):
     title = models.CharField(max_length=100)

     def __unicode__(self):
         return self.title

 class Tagger(models.Model):
     class Meta:
         '''unique_together = ('tag', 'object_id')'''

     tag = models.ForeignKey(Tag)
     content_type    = models.ForeignKey(ContentType)
     object_id       = models.PositiveIntegerField()
     content_object  = generic.GenericForeignKey()
 }}}

 and creating the admin objects like this:

 {{{
 class TagAdmin(admin.ModelAdmin):
     list_display = ('slug',)

 class TabularTagInline(generic.GenericTabularInline):
     model = models.Tagger
     extra = 2

 class NewsAdmin(admin.ModelAdmin):
     list_display = ('title', )
     inlines = (TabularTagInline,)

 admin.site.register(Blog, BlogAdmin)
 admin.site.register(Tag, TagAdmin)
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/21705>
Django <https://code.djangoproject.com/>
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