如何在猫鼬的嵌套数组中插入文档

Question

我正在尝试将文档推送到 mongoose 的嵌套数组中。我也成功地将文档保存在数组中。但我想要的是新保存的文档应该在回调函数中返回（因为它有我需要的 ObjectId）。下面是我的代码：

SocialPost.updateOne({_id: req.body._id, "comments._id": req.body.commentId},
        {$push :{'comments.$.replies': {replyAuthor: req.body.replyAuthor, reply: req.body.reply, 
            authorProfile: req.body.authorProfile, dateOfReply: req.body.dateOfReply}}},
            function(err,result){
                if(err)
                    res.json({err});
                else
                    {console.log(result);res.json({});}
            })

控制台输出如下：

{
  n: 1,
  nModified: 1,
  opTime: {
    ts: Timestamp { _bsontype: 'Timestamp', low_: 1, high_: 1624684305 },
    t: 8
  },
  electionId: 7fffffff0000000000000008,
  ok: 1,
  '$clusterTime': {
    clusterTime: Timestamp { _bsontype: 'Timestamp', low_: 1, high_: 1624684305 },
    signature: { hash: [Binary], keyId: [Long] }
  },
  operationTime: Timestamp { _bsontype: 'Timestamp', low_: 1, high_: 1624684305 }
}

我在上面的输出中看不到新插入的文档。

我的问题是如何检索新插入的文档（甚至是 repiles 数组或注释数组），以便将文档返回给用户？

谢谢！

编辑： 如果有人需要它，下面是架构：

const PostSchema=mongoose.Schema({
    author: String,
    uid: String,
    email: String,
    title: String,
    userProfile: String,
    description: String,
    file: String,
    fileType: String,
    subGratis: String,
    dateTime: String,
    likes: Number,
    hearts: Number, 
    comments:[
        {
            commentAuthor: String,
            uid: String,
            comment: String,
            userProfile: String,
            dateOfComment: String,
            replies: [{
                replyAuthor: String,
                authorProfile: String,
                reply: String,
                dateOfReply: String
            }]
        }
    ]
},{collection: 'SocialPost'});