Merge remote-tracking branch 'upstream/master'

docs/api-guide/generic-views.md

@@ -150,7 +150,7 @@ Provides a base view for acting on a single object, by combining REST framework'
 
 * `queryset` - The queryset that should be used when retrieving an object from this view.  If unset, defaults to the default queryset manager for `self.model`.
 * `pk_kwarg` - The URL kwarg that should be used to look up objects by primary key. Defaults to `'pk'`. [Can only be set to non-default on Django 1.4+]
-* `slug_kwarg` - The URL kwarg that should be used to look up objects by a slug. Defaults to `'slug'`.  [Can only be set to non-default on Django 1.4+]
+* `slug_url_kwarg` - The URL kwarg that should be used to look up objects by a slug. Defaults to `'slug'`.  [Can only be set to non-default on Django 1.4+]
 * `slug_field` - The field on the model that should be used to look up objects by a slug.  If used, this should typically be set to a field with `unique=True`. Defaults to `'slug'`.
 
 ---

docs/topics/release-notes.md

@@ -6,6 +6,10 @@
 
 ## 2.1.x series
 
+### Master
+
+* Bugfix: Related fields now respect the required flag, and may be required=False.
+
 ### 2.1.12
 
 **Date**: 21st Dec 2012

rest_framework/fields.py

@@ -357,7 +357,12 @@ class RelatedField(WritableField):
         if self.read_only:
             return
 
-        value = data.get(field_name)
+        try:
+            value = data[field_name]
+        except KeyError:
+            if self.required:
+                raise ValidationError(self.error_messages['required'])
+            return
 
         if value in (None, '') and not self.null:
             raise ValidationError('Value may not be null')

rest_framework/tests/serializer.py

@@ -308,6 +308,38 @@ 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):