SQLAlchemy update 报错

更新语句是这样的：

python result = Doctor.query\ .filter(Doctor.department_id==department_id) \ .filter(Doctor.id.in_(tuple(doctor_ids))) \ .update({"department_id":None}) 执行的时候报错

sqlalchemy.exc.InvalidRequestError: Could not evaluate current criteria in Python: "Cannot evaluate clauselist with operator ". Specify 'fetch' or False for the synchronize_session parameter. Traceback (most recent call last):

解决方法是：

result = Doctor.query\
            .filter(Doctor.department_id==department_id) \
            .filter(Doctor.id.in_(tuple(doctor_ids))) \
            .update({"department_id":None}, synchronize_session='fetch')

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