Mongodb 数组 $push 和 $pull

Question

我希望从数组中提取一些值并同时尝试更新它。

    userSchema.statics.experience = function (id,xper,delet,callback) {
    var update = {
      $pull:{
        'profile.experience' : delet
      },

        $push: {
          'profile.experience': xper
        }
  };
  this.findByIdAndUpdate(id,update,{ 'new': true},function(err,doc) {
    if (err) {
      callback(err);
    } else if(doc){
      callback(null,doc);
    }
  });
};

我收到如下错误:

MongoError: exception: Cannot update 'profile.experience' and 'profile.experience' at the same time

Answer 1

我找到了这个解释:

The issue is that MongoDB doesn’t allow multiple operations on the same property in the same update call. This means that the two operations must happen in two individually atomic operations.

你可以阅读那些帖子:

Pull and addtoset at the same time with mongo

multiple mongo update operator in a single statement?