Method my_col

test/orm/declarative/test_mixin.py:2365–2368

(cls)

        class Mixin:
            @declared_attr
            def my_col(cls):
                counter(cls)
                assert not orm_base._mapper_or_none(cls)
                return Column("x", Integer)

        class A(Base, Mixin):
            __tablename__ = "a"