thats a bug. its because the flush() is closing the "connection" you
passed to your session.
heres a patch that fixes it, which i will try to commit later today but
i want to work up some test cases:
Index: lib/sqlalchemy/orm/session.py
===================================================================
--- lib/sqlalchemy/orm/session.py (revision 1852)
+++ lib/sqlalchemy/orm/session.py (working copy)
@@ -37,7 +37,7 @@
e = connectable.engine
c = connectable.contextual_connect()
if not self.connections.has_key(e):
- self.connections[e] = (c, c.begin())
+ self.connections[e] = (c, c.begin(), c is not connectable)
return self.connections[e][0]
def commit(self):
if self.parent is not None:
@@ -58,7 +58,8 @@
if self.parent is not None:
return
for t in self.connections.values():
- t[0].close()
+ if (t[2]):
+ t[0].close()
self.session.transaction = None
class Session(object):
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