diff -r 4fb62d791073 -r 155c29e0ed1c server/migractions.py
--- a/server/migractions.py	Tue Sep 15 17:10:58 2015 +0200
+++ b/server/migractions.py	Fri Sep 18 14:29:53 2015 +0200
@@ -1560,12 +1560,14 @@
             else:
                 raise StopIteration
 
-    def next(self):
+    def __next__(self):
         if self._rsetit is not None:
-            return self._rsetit.next()
+            return next(self._rsetit)
         rset = self._get_rset()
         self._rsetit = iter(rset)
-        return self._rsetit.next()
+        return next(self._rsetit)
+
+    next = __next__
 
     def entities(self):
         try: