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-rw-r--r--lib/sqlalchemy/orm/session.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/session.py b/lib/sqlalchemy/orm/session.py
index 5bed7181c..82e1c6d6d 100644
--- a/lib/sqlalchemy/orm/session.py
+++ b/lib/sqlalchemy/orm/session.py
@@ -266,6 +266,7 @@ class Session(object):
def expunge(self, object):
"""removes the given object from this Session. this will free all internal references to the object."""
self.uow.expunge(object)
+ self._unattach(object)
def save(self, object, entity_name=None):
"""