Mongoose findOneAndUpdate with $addToSet pushes duplicate - mongodb

Question

I have a schema such as
listSchema = new Schema({
...,
arts: [
{
...,
art: { type: Schema.Types.ObjectId, ref: 'Art', required: true },
note: Number
}
]
})
My goal is to find this document, push an object but without duplicate
The object look like
var art = { art: req.body.art, note: req.body.note }
The code I tried to use is
List.findOneAndUpdate({ _id: listId, user: req.myUser._id },
{ $addToSet: { arts: art} },
(err, list) => {
if (err) {
console.error(err);
return res.status(400).send()
} else {
if (list) {
console.log(list)
return res.status(200).json(list)
} else {
return res.status(404).send()
}
}
})
And yet there are multiple entries with the same Art id in my Arts array.
Also, the documentation isn't clear at all on which method to use to update something. Is this the correct way ? Or should I retrieve and then modify my object and .save() it ?
Found a recent link that came from this

Answer 1

List.findOneAndUpdate({ _id: listId, user: req.user._id, 'arts.art': artId }, { $set: { 'arts.$[elem]': artEntry } }, { arrayFilters: [{ 'elem.art': mongoose.Types.ObjectId(artId) }] })
artworkEntry being my modifications/push.
But the more I'm using Mongoose, the more it feels they want you to use .save() and modify the entries yourself using direct modification.
This might cause some concurrency but they introduced recently a, option to use on the schema { optimisticConcurrency: true } which might solve this problem.