- Now uses sqlalchemy.orm.exc.DetachedInstanceError when an

attribute load or refresh action fails due to object
being detached from any Session.   UnboundExecutionError
is specific to engines bound to sessions and statements.

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/exc.py b/lib/sqlalchemy/orm/exc.py
index 8b52eec8a..431acc15c 100644
--- a/lib/sqlalchemy/orm/exc.py
+++ b/lib/sqlalchemy/orm/exc.py
@@ -23,7 +23,9 @@ class FlushError(sa.exc.SQLAlchemyError):
 class UnmappedError(sa.exc.InvalidRequestError):
     """TODO"""
 
-
+class DetachedInstanceError(sa.exc.SQLAlchemyError):
+    """An attempt to access unloaded attributes on a mapped instance that is detached."""
+    
 class UnmappedInstanceError(UnmappedError):
     """An mapping operation was requested for an unknown instance."""