Test for GFK, using RelatedField. Refs #607.

rest_framework/tests/genericrelations.py

@@ -12,7 +12,7 @@ class Tag(models.Model):
     tag = models.SlugField()
     content_type = models.ForeignKey(ContentType)
     object_id = models.PositiveIntegerField()
-    content_object = GenericForeignKey('content_type', 'object_id')
+    tagged_item = GenericForeignKey('content_type', 'object_id')
 
     def __unicode__(self):
         return self.tag
@@ -25,20 +25,37 @@ class Bookmark(models.Model):
     url = models.URLField()
     tags = GenericRelation(Tag)
 
+    def __unicode__(self):
+        return 'Bookmark: %s' % self.url
+
+
+class Note(models.Model):
+    """
+    A textual note that may have multiple tags attached.
+    """
+    text = models.TextField()
+    tags = GenericRelation(Tag)
+
+    def __unicode__(self):
+        return 'Note: %s' % self.text
+
 
 class TestGenericRelations(TestCase):
     def setUp(self):
         self.bookmark = Bookmark.objects.create(url='https://www.djangoproject.com/')
-        Tag.objects.create(content_object=self.bookmark, tag='django')
-        Tag.objects.create(content_object=self.bookmark, tag='python')
+        Tag.objects.create(tagged_item=self.bookmark, tag='django')
+        Tag.objects.create(tagged_item=self.bookmark, tag='python')
+        self.note = Note.objects.create(text='Remember the milk')
+        Tag.objects.create(tagged_item=self.note, tag='reminder')
 
-    def test_reverse_generic_relation(self):
+    def test_generic_relation(self):
         """
         Test a relationship that spans a GenericRelation field.
+        IE. A reverse generic relationship.
         """
 
         class BookmarkSerializer(serializers.ModelSerializer):
-            tags = serializers.ManyRelatedField(source='tags')
+            tags = serializers.ManyRelatedField()
 
             class Meta:
                 model = Bookmark
@@ -50,3 +67,33 @@ class TestGenericRelations(TestCase):
             'url': u'https://www.djangoproject.com/'
         }
         self.assertEquals(serializer.data, expected)
+
+    def test_generic_fk(self):
+        """
+        Test a relationship that spans a GenericForeignKey field.
+        IE. A forward generic relationship.
+        """
+
+        class TagSerializer(serializers.ModelSerializer):
+            tagged_item = serializers.RelatedField()
+
+            class Meta:
+                model = Tag
+                exclude = ('id', 'content_type', 'object_id')
+
+        serializer = TagSerializer(Tag.objects.all())
+        expected = [
+        {
+            'tag': u'django',
+            'tagged_item': u'Bookmark: https://www.djangoproject.com/'
+        },
+        {
+            'tag': u'python',
+            'tagged_item': u'Bookmark: https://www.djangoproject.com/'
+        },
+        {
+            'tag': u'reminder',
+            'tagged_item': u'Note: Remember the milk'
+        }
+        ]
+        self.assertEquals(serializer.data, expected)