猫鼬在匹配元素后将对象推入嵌套数组答案

【问题标题】：mongoose push an object into a nested array after matching element猫鼬在匹配元素后将对象推入嵌套数组
【发布时间】：2022-01-03 13:14:27
【问题描述】：

在对象数组中找到匹配元素后，我试图将对象推入数组

这是我的播放列表集合的结构示例：

playlist: {
    userName: 'user-name',
    userId: 'user-id',
    playlistArray: [
        {
            playlistName: 'playlist1',
            playlistSongs: [
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
            ],
        },
        {
            playlistName: 'playlist2',
            playlistSongs: [
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
            ],
        },
    ],
}

这是我试图插入到playlistSongs 数组中的对象，该数组还包含同一对象中的playlistName: 'playlist2'

{ track: 'sometrackinfo', title: 'sometracktitle', duration: 123, uri: 'sometrackuri' }

所以结果应该是这样的：

playlist: {
    userName: 'user-name',
    userId: 'user-id',
    playlistArray: [
        {
            playlistName: 'playlist1',
            playlistSongs: [
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
            ],
        },
        {
            playlistName: 'playlist2',
            playlistSongs: [
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
                { track: '', title: '', duration: 0, uri: '' },
                { track: 'sometrackinfo', title: 'sometracktitle', duration: 123, uri: 'sometrackuri' },
            ],
        },
    ],
}

【问题讨论】：

标签： arrays mongodb mongoose

【解决方案1】：

使用arrayFilters 和过滤$[<identifier>] 运算符。

db.collection.update({},
{
  "$push": {
    "playlist.playlistArray.$[pl].playlistSongs": {
      track: "sometrackinfo",
      title: "sometracktitle",
      duration: 123,
      uri: "sometrackuri"
    }
  }
},
{
  arrayFilters: [
    {
      "pl.playlistName": "playlist2"
    }
  ]
})

Sample Mongo Playground

【讨论】：