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-rw-r--r--lib/sqlalchemy/ext/mutable.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/sqlalchemy/ext/mutable.py b/lib/sqlalchemy/ext/mutable.py
index 06c46a9df..6c26c9266 100644
--- a/lib/sqlalchemy/ext/mutable.py
+++ b/lib/sqlalchemy/ext/mutable.py
@@ -661,7 +661,8 @@ class MutableComposite(MutableBase):
prop = parent.mapper.get_property(key)
for value, attr_name in zip(
- self.__composite_values__(), prop._attribute_keys
+ prop._composite_values_from_instance(self),
+ prop._attribute_keys,
):
setattr(parent.obj(), attr_name, value)