E11000 重复键错误索引 - 从 mlab 中删除自动生成的 ID

Question

如何让 mlab/mongodb 停止自动生成这些 ID 之一？

key: { : ObjectId('584f7e76fd51ea874cee3c70') }",
"op":{"title":"Gold (feat. Lil Wayne) (Remix)",
"artist":"kiiara",
"audio":"https://api.soundcloud.com/tracks/293663905/stream?client_id=90d140308348273b897fab79f44a7c89",
"image":"https://i1.sndcdn.com/artworks-C09aBfgKDpCI-0-t500x500.jpg",
"download":"https://api.soundcloud.com/tracks/293663905/download",
"url":"https://soundcloud.com/kiiaraonline/gold-lil-wayne-remix",
"created":"2016-12-13T04:52:06.309Z",
"genres":{"hipHop":30,"house":20,"pop":50},
"_id":"584f7e76fd51ea874cee3c70"}

当我尝试创建关系时，我收到一条错误消息，提示有两个键。我认为这是因为有两个 ID。我怎样才能删除其中之一？最好是 ObjectId 之一。

奇怪的是，当我在数据库中查看它们时，我只看到这个

{
    "_id": {
        "$oid": "584f7e76fd51ea874cee3c70"
    },
    "title": "Gold (feat. Lil Wayne) (Remix)",
    "artist": "kiiara",
    "audio": "https://api.soundcloud.com/tracks/293663905/stream?client_id=90d140308348273b897fab79f44a7c89",
    "image": "https://i1.sndcdn.com/artworks-C09aBfgKDpCI-0-t500x500.jpg",
    "download": "https://api.soundcloud.com/tracks/293663905/download",
    "url": "https://soundcloud.com/kiiaraonline/gold-lil-wayne-remix",
    "created": {
        "$date": "2016-12-13T04:52:06.309Z"
    },
    "genres": {
        "hipHop": 30,
        "house": 20,
        "pop": 50
    }
}

谢谢

Answer 1

在更新中使用$exists，如下所示：

db.collectioName.update({"key":{"$exists":true}},{"$unset":{"key":""}},
                               {"upsert":false,"multi":true})

unset 删除所有匹配文档中的key 字段。