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-rw-r--r--lib/sqlalchemy/ext/mypy/decl_class.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/sqlalchemy/ext/mypy/decl_class.py b/lib/sqlalchemy/ext/mypy/decl_class.py
index 23c78aa51..b85ec0f69 100644
--- a/lib/sqlalchemy/ext/mypy/decl_class.py
+++ b/lib/sqlalchemy/ext/mypy/decl_class.py
@@ -61,6 +61,9 @@ def scan_declarative_assignments_and_apply_types(
List[util.SQLAlchemyAttribute]
] = util.get_mapped_attributes(info, api)
+ # used by assign.add_additional_orm_attributes among others
+ util.establish_as_sqlalchemy(info)
+
if mapped_attributes is not None:
# ensure that a class that's mapped is always picked up by
# its mapped() decorator or declarative metaclass before