From c13f132a21f5a0902cef74dfea12e586561774ca Mon Sep 17 00:00:00 2001
From: Yuri Prezument <y@yprez.com>
Date: Tue, 18 Dec 2012 14:09:58 +0200
Subject: [PATCH] Failing test with partial serializer and foreign keys

---
 rest_framework/tests/serializer.py | 32 ++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/rest_framework/tests/serializer.py b/rest_framework/tests/serializer.py
index 780177aa0..693c81c29 100644
--- a/rest_framework/tests/serializer.py
+++ b/rest_framework/tests/serializer.py
@@ -297,6 +297,38 @@ class ModelValidationTests(TestCase):
         self.assertFalse(second_serializer.is_valid())
         self.assertEqual(second_serializer.errors,  {'title': [u'Album with this Title already exists.']})
 
+    def test_foreign_key_with_partial(self):
+        """
+        Test ModelSerializer validation with partial=True
+
+        Specifically test foreign key validation.
+        """
+
+        album = Album(title='test')
+        album.save()
+
+        class PhotoSerializer(serializers.ModelSerializer):
+            class Meta:
+                model = Photo
+
+        photo_serializer = PhotoSerializer(data={'description': 'test', 'album': album.pk})
+        self.assertTrue(photo_serializer.is_valid())
+        photo = photo_serializer.save()
+
+        # Updating only the album (foreign key)
+        photo_serializer = PhotoSerializer(instance=photo, data={'album': album.pk}, partial=True)
+        self.assertTrue(photo_serializer.is_valid())
+        self.assertTrue(photo_serializer.save())
+
+        # Updating only the description
+        photo_serializer = PhotoSerializer(instance=photo,
+                                           data={'description': 'new'},
+                                           partial=True)
+
+        self.assertTrue(photo_serializer.is_valid())
+        self.assertTrue(photo_serializer.save())
+
+
 
 class RegexValidationTest(TestCase):
     def test_create_failed(self):