Add missing decorator: metadata_class

rest_framework/decorators.py

@@ -70,6 +70,9 @@ def api_view(http_method_names=None):
         WrappedAPIView.permission_classes = getattr(func, 'permission_classes',
                                                     APIView.permission_classes)
 
+        WrappedAPIView.metadata_class = getattr(func, 'metadata_class',
+                                                APIView.metadata_class)
+
         WrappedAPIView.versioning_class = getattr(func, "versioning_class",
                                                   APIView.versioning_class)
 
@@ -116,6 +119,13 @@ def permission_classes(permission_classes):
     return decorator
 
 
+def metadata_class(metadata_class):
+    def decorator(func):
+        func.metadata_class = metadata_class
+        return func
+    return decorator
+
+
 def versioning_class(versioning_class):
     def decorator(func):
         func.versioning_class = versioning_class

tests/test_decorators.py

@@ -6,7 +6,7 @@ from django.test import TestCase
 from rest_framework import status
 from rest_framework.authentication import BasicAuthentication
 from rest_framework.decorators import (
-    action, api_view, authentication_classes, parser_classes,
+    action, api_view, authentication_classes, metadata_class, parser_classes,
     permission_classes, renderer_classes, schema, throttle_classes,
     versioning_class
 )
@@ -162,6 +162,18 @@ class DecoratorTestCase(TestCase):
         response = view(request)
         assert response.data == {"version": "1.2.3"}
 
+    def test_metadata_class(self):
+        # From TestMetadata.test_none_metadata()
+        @api_view()
+        @metadata_class(None)
+        def view(request):
+            return Response({})
+
+        request = self.factory.options('/')
+        response = view(request)
+        assert response.status_code == status.HTTP_405_METHOD_NOT_ALLOWED
+        assert response.data == {'detail': 'Method "OPTIONS" not allowed.'}
+
     def test_schema(self):
         """
         Checks CustomSchema class is set on view