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-rw-r--r--lib/sqlalchemy/orm/base.py8
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/sqlalchemy/orm/base.py b/lib/sqlalchemy/orm/base.py
index d8f57e149..c5348c237 100644
--- a/lib/sqlalchemy/orm/base.py
+++ b/lib/sqlalchemy/orm/base.py
@@ -448,7 +448,13 @@ def _entity_descriptor(entity, key):
) from err
-_state_mapper = util.dottedgetter("manager.mapper")
+if TYPE_CHECKING:
+
+ def _state_mapper(state: InstanceState[_O]) -> Mapper[_O]:
+ ...
+
+else:
+ _state_mapper = util.dottedgetter("manager.mapper")
@inspection._inspects(type)