diff --git a/api/v1/__init__.py b/api/v1/__init__.py
new file mode 100644
index 00000000..423698bd
--- /dev/null
+++ b/api/v1/__init__.py
@@ -0,0 +1,43 @@
+from rest_framework import viewsets
+from rest_framework.response import Response
+
+# https://gist.github.com/ivlevdenis/a0c8f5b472b6b8550bbb016c6a30e0be
+
+
+class ExtendViewSet(object):
+    """
+    This viewset mixin class with extended options list.
+    """
+    permission_map = {}
+    throttle_scope_map = {}
+    serializer_class_map = {}
+
+    def get_serializer_class(self):
+        ser = self.serializer_class_map.get(self.action, None)
+        self.serializer_class = ser or self.serializer_class
+        return super().get_serializer_class()
+
+    def initialize_request(self, request, *args, **kwargs):
+        request = super().initialize_request(request, *args, **kwargs)
+        throttle_scope = self.throttle_scope_map.get(self.action, None)
+        cls_throttle_scope = getattr(self, 'throttle_scope', None)
+        self.throttle_scope = throttle_scope or cls_throttle_scope or ''
+        return request
+
+    def get_permissions(self):
+        perms = self.permission_map.get(self.action, None)
+        if perms and not isinstance(perms, (tuple, list)):
+            perms = [perms, ]
+        self.permission_classes = perms or self.permission_classes
+        return super().get_permissions()
+
+    def options(self, request, *args, **kwargs):
+        if self.metadata_class is None:
+            return self.http_method_not_allowed(request, *args, **kwargs)
+        data = self.metadata_class().determine_metadata(request, self)
+        data['actions']['GET'] = self.query_metadata
+        return Response(data, status=status.HTTP_200_OK)
+
+
+class ExtendedModelViewSet(ExtendViewSet, viewsets.ModelViewSet):
+    pass
diff --git a/api/v1/__init__py b/api/v1/__init__py
deleted file mode 100644
index e69de29b..00000000