Push object into array if exists otherwise set object in MongoDB - arrays

Question

This is the document I currently have:
{
"_id": "",
"title": "My Watchlist",
"series": [{
"seriesId": 1,
"following": true,
"seasons": []
}, {
"seriesId": 1,
"following": false,
"seasons": []
}]
}
As you can see there are currently 2 objects with the seriesId 1, but with a different following boolean.
If the query matches with _id it should push the new object into series, if within the "series"-array an object with the same "seriesId" already exists it should change the fields within that object, instead of adding a new object.
I currently have the following query:
users.update(
{"_id": req.body.userId},
{
"$push": {
"series": {"seriesId": req.body.seriesId, "following": req.body.following}
}
}, (err, data) => {
if (err)
next(err);
});
If I use $set it does not add the object if it didn't originaly exist yet, and as far as I know you cannot both use $push and $set?
Can this be fixed in any way or do I have to rethink my Schema?

Answer 1

You can use two update query :
if _id is found and seriesId is not in the array, add the new item to the array :
db.series.update({
"_id": req.body.userId,
"series": {
"$not": {
"$elemMatch": {
"seriesId": req.body.seriesId
}
}
}
}, {
$addToSet: {
series: {
"seriesId": req.body.seriesId,
"following": req.body.following,
"seasons": []
}
}
}, { multi: true });
if _id is found and seriesId is found in the array, update the array item :
db.series.update({
"_id": req.body.userId,
"series.seriesId": req.body.seriesId
}, {
$set: {
"series.$.following": req.body.following
}
}, { multi: true });