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-rw-r--r--lib/sqlalchemy/event/base.py6
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/sqlalchemy/event/base.py b/lib/sqlalchemy/event/base.py
index c16f6870b..83b34a17f 100644
--- a/lib/sqlalchemy/event/base.py
+++ b/lib/sqlalchemy/event/base.py
@@ -108,10 +108,12 @@ class _Dispatch(_DispatchCommon[_ET]):
"""
- # In one ORM edge case, an attribute is added to _Dispatch,
- # so __dict__ is used in just that case and potentially others.
+ # "active_history" is an ORM case we add here. ideally a better
+ # system would be in place for ad-hoc attributes.
__slots__ = "_parent", "_instance_cls", "__dict__", "_empty_listeners"
+ _active_history: bool
+
_empty_listener_reg: MutableMapping[
Type[_ET], Dict[str, _EmptyListener[_ET]]
] = weakref.WeakKeyDictionary()