session's merge method get error

[tonyshare]

tornado version latest
sqlalchemy version latest
tornado-sqlalchemy lastest

        with self.make_session() as session:
               try:
                    yield as_future(
                        session.merge(
                            Learner(
                                id=learner_id,
                            )
                        )
                    )

                    yield session.commit()
                except SQLAlchemyError as e:
                    yield as_future(session.rollback())

got error

Traceback (most recent call last):
  File "/srv/.venv/platform/lib/python3.10/site-packages/tornado/web.py", line 1790, in _execute
    result = await result
  File "/srv/.venv/platform/lib/python3.10/site-packages/tornado/gen.py", line 779, in run
    yielded = self.gen.throw(exc)
  File "/srv/web/api/manager/uplaod.py", line 117, in post
    yield as_future(session.merge(
  File "/srv/.venv/platform/lib/python3.10/site-packages/tornado/gen.py", line 766, in run
    value = future.result()
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
TypeError: 'Learner' object is not callable

is tornado-sqlalchemy only suport query method, or my code is miss use the as_future method?