1 files changed, 129 insertions, 0 deletions
diff --git a/tests/test_genericrelations.py b/tests/test_genericrelations.py
new file mode 100644
index 00000000..2d341344
--- /dev/null
+++ b/tests/test_genericrelations.py
@@ -0,0 +1,129 @@
+from __future__ import unicode_literals
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes.generic import GenericRelation, GenericForeignKey
+from django.db import models
+from django.test import TestCase
+from rest_framework import serializers
+
+
+class Tag(models.Model):
+    """
+    Tags have a descriptive slug, and are attached to an arbitrary object.
+    """
+    tag = models.SlugField()
+    content_type = models.ForeignKey(ContentType)
+    object_id = models.PositiveIntegerField()
+    tagged_item = GenericForeignKey('content_type', 'object_id')
+
+    def __unicode__(self):
+        return self.tag
+
+
+class Bookmark(models.Model):
+    """
+    A URL bookmark that may have multiple tags attached.
+    """
+    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(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_generic_relation(self):
+        """
+        Test a relationship that spans a GenericRelation field.
+        IE. A reverse generic relationship.
+        """
+
+        class BookmarkSerializer(serializers.ModelSerializer):
+            tags = serializers.RelatedField(many=True)
+
+            class Meta:
+                model = Bookmark
+                exclude = ('id',)
+
+        serializer = BookmarkSerializer(self.bookmark)
+        expected = {
+            'tags': ['django', 'python'],
+            'url': 'https://www.djangoproject.com/'
+        }
+        self.assertEqual(serializer.data, expected)
+
+    def test_generic_nested_relation(self):
+        """
+        Test saving a GenericRelation field via a nested serializer.
+        """
+
+        class TagSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = Tag
+                exclude = ('content_type', 'object_id')
+
+        class BookmarkSerializer(serializers.ModelSerializer):
+            tags = TagSerializer()
+
+            class Meta:
+                model = Bookmark
+                exclude = ('id',)
+
+        data = {
+            'url': 'https://docs.djangoproject.com/',
+            'tags': [
+                {'tag': 'contenttypes'},
+                {'tag': 'genericrelations'},
+            ]
+        }
+        serializer = BookmarkSerializer(data=data)
+        self.assertTrue(serializer.is_valid())
+        serializer.save()
+        self.assertEqual(serializer.object.tags.count(), 2)
+
+    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(), many=True)
+        expected = [
+        {
+            'tag': 'django',
+            'tagged_item': 'Bookmark: https://www.djangoproject.com/'
+        },
+        {
+            'tag': 'python',
+            'tagged_item': 'Bookmark: https://www.djangoproject.com/'
+        },
+        {
+            'tag': 'reminder',
+            'tagged_item': 'Note: Remember the milk'
+        }
+        ]
+        self.assertEqual(serializer.data, expected)