Class Child

examples/versioned_rows/versioned_rows_w_versionid.py:132–146

class Child(Versioned, Base):
    __tablename__ = "child"

    data = Column(String)

    def new_version(self, session):
        # expire parent's reference to us
        session.expire(self.parent, ["child"])

        # create new version
        Versioned.new_version(self, session)

        # re-add ourselves to the parent.  this causes the
        # parent foreign key to be updated also
        self.parent.child = self


Base.metadata.create_all(engine)