500服务器错误,flask sqlalchemy查询数据库500错误，flasksqlalchemy,database.py

500服务器错误,flask sqlalchemy查询数据库500错误，flasksqlalchemy,database.py

database.py 定义了session

engine = create_engine(settings.DB_URI, echo=True)Base = declarative_base()dbsession = scoped_session(sessionmaker(bind=engine))

views中的get.py

@get.route('/quro/<int:qid>')def get_quro(qid=None):    data = '123'    if not qid is None:        quro_item = dbsession.query(Quro).filter_by(qid=qid).fisrt()        ...    ...    return data

quro_item始终是返回服务器错误500，求大侠们解救

编橙之家文章，