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-rw-r--r--lib/sqlalchemy/orm/session.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/session.py b/lib/sqlalchemy/orm/session.py
index 3517eab2b..30a84bf1a 100644
--- a/lib/sqlalchemy/orm/session.py
+++ b/lib/sqlalchemy/orm/session.py
@@ -511,7 +511,6 @@ class Session(object):
self._enable_transaction_accounting = _enable_transaction_accounting
self.twophase = twophase
self._query_cls = query_cls
- self._mapper_flush_opts = {}
if extension:
for ext in util.to_list(extension):
@@ -530,6 +529,8 @@ class Session(object):
dispatch = event.dispatcher(SessionEvents)
+ connection_callable = None
+
def begin(self, subtransactions=False, nested=False):
"""Begin a transaction on this Session.