MongoDB更新对象值的嵌套对象[重复]

Question

我的格式是：

{
        "_id" : ObjectId("5af44cfbe2e96c58ec402efb"),
        "username" : "egealpay2",
        "email" : "egealpay2@gmail.com",
        "fullName" : "ege",
        "pnumber" : "",
        "oneSignal" : "d427dcdf-7939-4ada-a035-be74e1e45091",
        "friends" : [
                {
                        "email" : "baransrc@gmail.com",
                        "status" : 2
                }
        ],
        "alarms" : [
                {
                        "id" : "2",
                        "title" : "before",
                        "location" : "default",
                        "startTime" : "2018-05-16\t\t\t16:29",
                        "endTime" : "16:29\t\t\t17 - 05 - 2018",
                        "remindAt" : "17:29\t\t\t15 - 05 - 2018",
                        "privacy" : "0",
                        "userORJoinedAlarm" : "1",
                        "eventJoiners" : [
                                {
                                        "email" : "ilkersadya@sabanciuniv.edu",
                                        "status" : 1
                                },
                                {
                                        "email" : "ilkercankayasss@sabanciuniv.edu",
                                        "status" : 1
                                },
                                {
                                        "email" : "ilkearcankaya@sabanciuniv.edu",
                                        "status" : 1
                                },
                                {
                                        "email" : "iaaalkercankaya@sabanciuniv.edu",
                                        "status" : 1
                                }
                        ],
                        "comments" : [ ]
                }
        ]
}

我想设置status: 2 of "email" : "ilkersadya@sabanciuniv.edu", its under"alarms:" , "eventJoiners" :which has an id of 2 as"id"`

我尝试使用带有 $ 的推送，但无法使其正常工作，并且它一直困扰着我超过 2 小时。

感谢@Ashish，我已经尝试过更新：

 dbo.collection("users").findOne( { email: userId } , function(errZer, addedZer) {
          dbo.collection("users").findOneAndUpdate( {email: addedID, "alarms.id": eventIDGiv,  alarms: { $elemMatch: { id: '2', eventJoiners: { $elemMatch: { email: addedID } } }} },
          { $set: { "alarms.$.eventJoiners.$.status": '2' } , function(err, added) {

得到错误

(node:9334) UnhandledPromiseRejectionWarning: MongoError: Too many positional (i.e. '$') elements found in path 'alarms.$.eventJoiners.$.status'

Answer 1

位置运算符 ($) 只能用于一级嵌套数组。在您的情况下，您必须为alarms 和eventJoiners 指定条件。为此，您可以使用 $[< identifier >] 语法（在 MongoDB 3.6+ 中可用）：

db.collection.update(
    { _id: ObjectId("5af44cfbe2e96c58ec402efb") },
    { $set: { "alarms.$[elem1].eventJoiners.$[elem2].status": "2" } },
    { arrayFilters: [ { "elem1.id": "2" }, { "elem2.email": "ilkersadya@sabanciuniv.edu" } ]})

在这种情况下，标识符elem1 和elem2 用作arrayFilters 部分中指定条件的占位符。