so i have this models

```
const postSchema = new mongoose.Schema({
    image: [{type: String, required: true, unique: true}],
    comments: [{
        id: {type: mongoose.Schema.Types.ObjectId},
        user: {type: mongoose.Schema.Types.ObjectId, ref: 'user'},
        comments: {type: String},
        like: [{type: mongoose.Schema.Types.ObjectId, ref: 'user'}],
        time: {type: Date, default: Date.now}
    }],
    caption: {type: String},
    user: {type: mongoose.Schema.Types.ObjectId, ref: 'user', required: true},
    like: [{type: mongoose.Schema.Types.ObjectId, ref: 'user'}],
    status: {type: Number,default: 0}
}, {timestamps: true});

```

what i'm trying to do is to push comments' like based on comments' id
i've try 

```
Post.findOneAndUpdate({
            _id:req.body.postid,
            'comments.id':req.body.id
        }, {
            $push :{
                "comments.$.like" : res.userdata.id
            }
        }, {}, err => {
            if(err){
                res.status(500).json({
                    err: err
                })
            }else {
                res.status(200).json({
                    message: "success",
                });
            }
        });

```

but it doesn't work.. and the worse is this is the document when i find the post

```
"_id" : ObjectId("5d6d4754599d8b06c01b1894"),
    "image" : [
            "2019-09-02T16-46-11.835Z123 - Copy.jpg",
            "2019-09-02T16-46-11.892Z123.jpg",
            "2019-09-02T16-46-11.938Z8358-dragon-1680x1050-digital-art-wallpaper - Copy.jpg",
            "2019-09-02T16-46-11.943Z8358-dragon-1680x1050-digital-art-wallpaper.jpg",
            "2019-09-02T16-46-11.949Zasd.jpg",
            "2019-09-02T16-46-11.979Zasd1.jpg",
            "2019-09-02T16-46-11.991Zwallpaper2you_567134.jpg"
    ],
    "like" : [ ],
    "status" : 0,
    "caption" : "asd",
    "user" : ObjectId("5d6c8d934a401d3748ef0c3e"),
    "comments" : [
            {
                    "like" : [ ],
                    "_id" : ObjectId("5d6d476f599d8b06c01b189a"),
                    "time" : ISODate("2019-09-02T16:46:39.499Z")
            }
    ],
    "createdAt" : ISODate("2019-09-02T16:46:12.034Z"),
    "updatedAt" : ISODate("2019-09-02T16:46:39.498Z"),
    "__v" : 0

```

idk why user and comments subdocuments is deleted and even the like field doesn't push

note: my mongoose dependencies `"mongoose": "^5.6.4",`

any suggestion?
sorry for my bad english