Correctly propagate cloned_request for OPTIONS

Update to fix pending changes in #1507

rest_framework/generics.py

@@ -398,10 +398,11 @@ class GenericAPIView(views.APIView):
             if method not in self.allowed_methods:
                 continue
 
-            cloned_request = clone_request(request, method)
+            original_request = self.request
+            self.request = clone_request(request, method)
             try:
                 # Test global permissions
-                self.check_permissions(cloned_request)
+                self.check_permissions(self.request)
                 # Test object permissions
                 if method == 'PUT':
                     try:
@@ -419,6 +420,8 @@ class GenericAPIView(views.APIView):
                 # appropriate metadata about the fields that should be supplied.
                 serializer = self.get_serializer()
                 actions[method] = serializer.metadata()
+            finally:
+                self.request = original_request
 
         if actions:
             ret['actions'] = actions

tests/test_generics.py

@@ -681,3 +681,42 @@ class TestFilterBackendAppliedToViews(TestCase):
         response = view(request).render()
         self.assertContains(response, 'field_b')
         self.assertNotContains(response, 'field_a')
+
+    def test_options_with_dynamic_serializer(self):
+        """
+        Ensure that OPTIONS returns correct POST json schema:
+        DynamicSerializer with single field 'field_b'
+        """
+        request = factory.options('/')
+        view = DynamicSerializerView.as_view()
+
+        with self.assertNumQueries(0):
+            response = view(request).render()
+
+        expected = {
+            'name': 'Dynamic Serializer',
+            'description': '',
+            'renders': [
+                'text/html',
+                'application/json'
+            ],
+            'parses': [
+                'application/json',
+                'application/x-www-form-urlencoded',
+                'multipart/form-data'
+            ],
+            'actions': {
+                'POST': {
+                    'field_b': {
+                        'type': u'string',
+                        'required': True,
+                        'read_only': False,
+                        'label': u'field b',
+                        'max_length': 100
+                    }
+                }
+            }
+        }
+
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        self.assertEqual(response.data, expected)