From 705af6601528c679068e05c56aebfa9436cfccc2 Mon Sep 17 00:00:00 2001
From: Andrew Somerville <andy.somerville@gmail.com>
Date: Thu, 16 Jul 2015 00:19:51 -0400
Subject: [PATCH] add 'metadata' mixin to handle options requests re
 tomchristie/django-rest-framework#3157

---
 rest_framework/mixins.py   | 11 +++++++++++
 rest_framework/viewsets.py |  1 +
 2 files changed, 12 insertions(+)

diff --git a/rest_framework/mixins.py b/rest_framework/mixins.py
index 1104aa29c..a5ec9c3d9 100644
--- a/rest_framework/mixins.py
+++ b/rest_framework/mixins.py
@@ -89,3 +89,14 @@ class DestroyModelMixin(object):
 
     def perform_destroy(self, instance):
         instance.delete()
+
+
+class MetadataModelMixin(object):
+    def metadata(self, request, *args, **kwargs):
+        """
+        Handler method for HTTP 'OPTIONS' request.
+        """
+        if self.metadata_class is None:
+            return self.http_method_not_allowed(request, *args, **kwargs)
+        data = self.metadata_class().determine_metadata(request, self)
+        return Response(data, status=status.HTTP_200_OK)
diff --git a/rest_framework/viewsets.py b/rest_framework/viewsets.py
index 819deb430..7f3c07ddd 100644
--- a/rest_framework/viewsets.py
+++ b/rest_framework/viewsets.py
@@ -146,6 +146,7 @@ class ModelViewSet(mixins.CreateModelMixin,
                    mixins.UpdateModelMixin,
                    mixins.DestroyModelMixin,
                    mixins.ListModelMixin,
+                   mixins.MetadataModelMixin,
                    GenericViewSet):
     """
     A viewset that provides default `create()`, `retrieve()`, `update()`,