Add support for python3.3 list.clear() on orm.collections

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/sqlalchemy/orm/collections.py b/lib/sqlalchemy/orm/collections.py
index 6bd5ac968..fd1677058 100644
--- a/lib/sqlalchemy/orm/collections.py
+++ b/lib/sqlalchemy/orm/collections.py
@@ -1161,6 +1161,15 @@ def _list_decorators():
         _tidy(pop)
         return pop
 
+    def clear(fn):
+        def clear(self, index=-1):
+            __before_delete(self)
+            for item in self:
+                __del(self, item)
+            fn(self)
+        _tidy(clear)
+        return clear
+
     # __imul__ : not wrapping this.  all members of the collection are already
     # present, so no need to fire appends... wrapping it with an explicit
     # decorator is still possible, so events on *= can be had if they're