diff -r 3051b847c124 -r d427a6db1902 server/python/django2/renkanmanager/api/views.py
--- a/server/python/django2/renkanmanager/api/views.py	Tue Jun 21 17:53:06 2016 +0200
+++ b/server/python/django2/renkanmanager/api/views.py	Wed Jun 22 01:03:58 2016 +0200
@@ -34,7 +34,7 @@
         View for listing renkans or posting new renkan
     """
 
-    queryset = Renkan.objects
+    queryset = Renkan.objects.select_related('current_revision')
 
     def get(self, request, workspace_guid='', format=None):
         if workspace_guid == '':
@@ -58,7 +58,7 @@
         source_revision = None
         if source_renkan_guid is not None:
             try:
-                source_renkan=Renkan.objects.get(renkan_guid=source_renkan_guid)
+                source_renkan=Renkan.objects.select_related('current_revision').get(renkan_guid=source_renkan_guid)
             except Renkan.DoesNotExist:
                 return Response({'detail': 'Source renkan %s does not exist'%source_renkan_guid}, status=status.HTTP_404_NOT_FOUND)
             source_revision = source_renkan.current_revision
@@ -99,7 +99,7 @@
         View for retrieving, updating or deleting a single renkan
     """
     lookup_field = "renkan_guid"
-    queryset = Renkan.objects
+    queryset = Renkan.objects.select_related('current_revision')
 
     def get_object(self, renkan_guid):
         try: