相关疑难解决方法(0)

我想知道一个脏的道具的"干净"值在这样的预先保存的猫鼬钩子中是什么:

UserSchema.pre('save', function(next) {
    var user = this;

    if (user.isModified('password')){
       //i want to know what the value of user.password was before it was changed
    }
    next()
}

是否可以查找旧值而无需在数据库中查找？