Override NoteViewSet.update to refresh MongoDB on note edit - fixes k…

…obotoolbox#253

onadata/apps/api/viewsets/note_viewset.py

@@ -62,7 +62,7 @@ class NoteViewSet(ViewPermissionMixin, ModelViewSet):
     permission_classes = [permissions.ViewDjangoObjectPermissions,
                           permissions.IsAuthenticated, ]
 
-    #u This used to be post_save. Part of it is here, permissions validation
+    # This used to be post_save. Part of it is here, permissions validation
     # has been moved to the note serializer
     def perform_create(self, serializer):
         obj = serializer.save(user=self.request.user)
@@ -73,6 +73,19 @@ def perform_create(self, serializer):
         # make sure parsed_instance saves to mongo db
         obj.instance.parsed_instance.save()
 
+    def update(self, request, *args, **kwargs):
+        """Override update to refresh the MongoDB representation of the instance when a note is edited.
+
+        We call the parent method first, to save the updated note to the DB. It returns a response, which we return
+        after making sure that MongoDB is updated.
+        """
+        response = super(NoteViewSet, self).update(request, *args, **kwargs)
+        obj = self.get_object()
+        instance = obj.instance
+        # update mongo data
+        instance.parsed_instance.save()
+        return response
+
     def destroy(self, request, *args, **kwargs):
         obj = self.get_object()
         instance = obj.instance