Class Parent

test/ext/test_associationproxy.py:2690–2694

        # 1. build parent, Mixin.children gets invoked, we add
        # Parent.children
        class Parent(Mixin, Base):
            __tablename__ = "parent"
            id = Column(Integer, primary_key=True)

            _children = relationship("Child")

        class Child(Base):
            __tablename__ = "child"