我想知道肮脏道具的’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() }
是否有可能在不查找数据库的情况下查找旧值?