Assign roles to users in mongoose - node.js

Question

I am trying to update a users role using mongoose . I have been using mongoose findOneAndUpdate but have not been able to update the role. I dont get any error messages but i get the doc before the update. So i did some research and tried to add {new:true} but it did not change anything. Then I saw someone use the aggregate query $push but that did not either work.
I have rewritten this query many times without giving me the expected results
exports.changeRole = async (req, res) => {
User.findOneAndUpdate(
{ id: req.param.userId },
{
$push: {
$set: { "roles[0].name": req.body.name },
},
},
{ new: true }
)
.populate("roles", "-__v")
.exec((err, data) => {
if (err) {
console.log(err);
} else {
console.log(data);
}
});
};
How I send in postman
{
"roles": ["Admin"]
}
This is what i get in my console:
{
roles: [ { _id: 606242fa3bcbc13305bee567, name: 'user' } ],
_id: 606307a839a54f7982f8ff84,
username: 'before',
email: 'before#gmail.com',
password: '$2a$/lvMv80IPZe9FSm',
__v: 1
}
I have one model that is called User
const userSchema = new mongoose.Schema(
{
username: {
type: String,
required: true,
min: 6,
max: 255,
},
email: {
type: String,
required: true,
min: 6,
max: 255,
},
password: {
type: String,
required: true,
min: 6,
max: 15,
},
roles: [
{
type: mongoose.Schema.Types.ObjectId,
ref: "Role",
},
],
},
{ timestamp: true }
);
This User model is referencing to Role.js. An array of objectId:s. So automatically I have four role documents created if they dont exist. Every user is referencing to one of those documents(roles)
const Role = mongoose.model(
"Role",
new mongoose.Schema({
name: String,
})
);

Answer 1

I was not thinking it right. I did not need to change my populated documents only needed to change the objectId it was referencing to in my roles:[] in User.js. Use $set to change a field and $push to to add new value.
exports.changeRole = async (req, res) => {
await User.findOneAndUpdate(
{ id: req.params.userId },
{
$set: { roles: req.body.roles },
},
{ new: true }
)
.populate("roles")
.then((data) => {
if (!data) return res.status(404).send("Not found");
res.send(data);
})
.catch((err) => {
return res.status(500).send({ message: err.message });
});
};