更新 mongo 中的 Collection 记录答案

【问题标题】：update Collection record in mongo更新 mongo 中的 Collection 记录
【发布时间】：2018-05-07 06:00:21
【问题描述】：

我目前正在为我当前的项目开发 mongodb。

{
    "_id" : ObjectId("5a168f467cf3661df0df9c11"),
    "player_id" : "5a02db1170aaf41013d32747",
    "quiz_type" : "Single",
    "created_date" : ISODate("2017-11-23T09:05:10Z"),
    "questions_answered" : [
        {
            "question_id" : ObjectId("5a0ac1bfa9897441e038c2f7"),
            "player_selection_status" : "Pending",
            "time_taken" : 0,
            "points_gained" : 0,
            "like" : 0
        },
        {
            "question_id" : ObjectId("5a0ac212a9897441e038c2f8"),
            "player_selection_status" : "Pending",
            "time_taken" : 0,
            "points_gained" : 0,
            "like" : 0
        }
    ],
    "__v" : 0
}

以上是我在玩家收藏中的记录，我想更新第二个

"questions_answered" : [  {
            "question_id" : ObjectId("5a0ac212a9897441e038c2f8"),
            "player_selection_status" : "Pending",
            "time_taken" : 0,
            "points_gained" : 0,
            "like" : 0
 }

喜欢

"player_selection_status" : "Correct",
"time_taken" : 10,
"points_gained": 5,
"like": 10,
"answered_date":ISODate("2017-11-23T09:05:10Z")

我试过如下

updateData = {questions_answered: {time_taken: 10, like: 1, 
     answered_date: moment().format()}};
Player_quiz.update({_id: qid, player_id: uid, 
    "questions_answered.question_id": question_id}, 
    {$set: updateData}).exec();

但这对我不起作用..请帮助我解决正确的解决方案？？

【问题讨论】：

标签： mongodb mongoose mongodb-query

【解决方案1】：

您必须使用positional operator $ 进行数组更新。这里我们有 questions_answered 作为文档数组。

更新文档的查询是

db.collection.update(
    {"questions_answered.question_id" : ObjectId("5a0ac212a9897441e038c2f8")},
    {$set: { 
      "questions_answered.$.time_taken":10,
      "questions_answered.$.player_selection_status" : "Correct",
      "questions_answered.$.points_gained": 5, 
      "questions_answered.$.like": 10, 
      "questions_answered.$.answered_date":ISODate("2017-11-23T09:05:10Z")
    }}
 );

【讨论】：

【解决方案2】：

db.collection.update({
        questions_answered: {
            $elemMatch: {
                "question_id": ObjectId("5a0ac212a9897441e038c2f8")
            }
        }
    }, {
        $set: {
            "questions_answered.$.player_selection_status": "Correct",
            "questions_answered.$.time_taken": 10,
            "questions_answered.$.points_gained": 5,
            "questions_answered.$.like": 10,
            "questions_answered.$.answered_date": ISODate("2017-11-23T09:05:10Z")
        }

    }

)

在上述查询中，$elemMatch 运算符用于匹配数组中的元素

【讨论】：