TurboGears：管理 crud 中的 sqlalchemy.exc.ArgumentError

如何解决TurboGears：管理 crud 中的 sqlalchemy.exc.ArgumentError

如果我将自动 crud 用于管理部分，有时，当我尝试创建/编辑某个对象时，我会遇到以下错误：

sqlalchemy.exc.ArgumentError: Class object expected,got '<bound method _class_resolver._resolve_name of <sqlalchemy.ext.declarative.clsregistry._class_resolver object at 0x7f2aba659860>>'.

例如，如果我尝试编辑（或创建）广告，我有以下模型：

class User(DeclarativeBase):
    __tablename__ = 'tg_user'

    user_id = Column(Integer,autoincrement=True,primary_key=True)
    user_name = Column(Unicode(16),unique=True,nullable=False)
    email_address = Column(Unicode(255),nullable=False)
    display_name = Column(Unicode(255))
    _password = Column('password',Unicode(128))
    created = Column(DateTime,default=datetime.Now)

    tg_player_id = Column(Integer,ForeignKey('player.player_id'))
    player = relationship("Player",backref='tg_user')


class Player(DeclarativeBase):

    __tablename__ = 'player'

    player_id = Column(Integer,primary_key=True,nullable=False)
    player_tg_id = Column(Unicode(30))
    username = Column(Unicode(100))