Update String inside object inside array mongodb - node.js

Question

I have a document that looks something like this
{
"_id":{
"$oid":"id"
},
"side1":[
{
"username":"test1",
"id":"id1",
},
{
"username":"test2",
"id":"id2",
},
{
"username":"test3",
"id":"id3",
}
],
"side2":[
{
"username":"test4",
"id":"id4",
},
{
"username":"test5",
"id":"id5",
},
{
"username":"test6",
"id":"id6",
}
],
}
I want to be able to search and update one of the sides, for example, if I searched with username for side1 and that username would be there then I would be able to $set other fields for the object with this username. Something like: Search side1 username test1: $set result.id: "43242342" this would set the id of the object with the username of test1 to 43242342. I am not sure on how I would go about doing this, I have tried using $elemMatch but that didn't bring any results.
Test.findOne({ id: id },
{ side1: { $elemMatch: {username: username} } }, function (err, result) {
if (err) {
console.log(err);
} else {
console.log(result)
}
});

Answer 1

I'm not exactly sure how you want to update the document, but perhaps this is what you are looking for?
db.collection.update({
"_id": ObjectId("000000000000000000000001"),
"side1.username": "test1"
},
{
"$set": {
"side1.$.id": "43242342"
}
})
Try it on mongoplayground.net.
Example updated document:
[
{
"_id": ObjectId("000000000000000000000001"),
"side1": [
{
"id": "43242342",
"username": "test1"
},
{
"id": "id2",
"username": "test2"
},
{
"id": "id3",
"username": "test3"
}
],
"side2": [
{
"id": "id4",
"username": "test4"
},
{
"id": "id5",
"username": "test5"
},
{
"id": "id6",
"username": "test6"
}
]
}
]

Answer 2

Could you do something like this?
function addProperty(id, side, username, property, value) {
const query = {
_id: {
$oid: id,
},
};
const update = {
$push: {
[side]: {
username: username,
[property]: value,
},
},
};
const options = {
upsert: true,
};
db.collection("Test").updateOne(query, update, options);
}