.save() method not working?

Question

Node.js

The problem is, there is a code

router.post('/add-file-to-play-list', async (req, res) => {
    const user = await User.findById({_id: req.body.userId})
    const music = await Music.findById({_id: req.body.audioId})
    const indexPlayList = await getIndexEl(user.playLists, 'name', req.body.namePlayList)
    const indexMainPlayList = await getIndexEl(music.files, 'name', req.body.nameAudio)
    const playList = user.playLists[indexPlayList]
    if(!playList.files) {
        playList.files = []
    }
    playList.files.push(music.files[indexMainPlayList])
    await user.save()
    res.send(JSON.stringify({
        user
    }))
})

I send a request, in response I receive a generated object

{
    "user": {
        "role": 0,
        "avatar": "storage/avatars/avatar.png",
        "playLists": [
            {
                "name": "Избранные",
                "files": [
                    {
                        "name": "I'm So Sick",
                        "path": "storage/music/flyleaf/01-i'm-so-sick.m4a",
                        "likes": 0,
                        "year": 2005
                    }
                ]
            }
        ],
        "_id": "5f68bf62e85ae5056c5854d8",
        "email": "[email protected]",
        "login": "user",
        "password": "$2a$10$KTiyMuZnC.IYzw81VpqsN.cflWMZJA.dQXGeQhsnWJruvYRKM.00S",
        "__v": 4
    }
}

Ran console.log(user) before await user.save(), the user object matches the changes. Also, the callback function in the save() method works without errors. But there are no changes in the database. The files array should be added.

Answer 1

try before saving

user.markModified('playLists')
// или это
// user.markModified('playLists.files')

https://mongoosejs.com/docs/api/document.html#docu...