Fixed undo when adapting IMultiCommitStorages

zopefoundation · Jul 2, 2016 · 831f56a · 831f56a
1 parent 76db3de
commit 831f56a
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/src/ZODB/mvccadapter.py b/src/ZODB/mvccadapter.py
@@ -244,8 +244,11 @@ def undo(self, transaction_id, transaction):
     def tpc_vote(self, transaction):
         result = self._storage.tpc_vote(transaction)
         if result:
-            for oid, serial in result:
-                self._undone.add(oid)
+            if isinstance(result[0], bytes):
+                self._undone.update(set(result))
+            else:
+                for oid, _ in result:
+                    self._undone.add(oid)
 
     def tpc_finish(self, transaction, func = lambda tid: None):