mongodb won't delete an element from ObjectId array - node.js

Question

My schema looks like the following:
const userSchema = new Schema({
...
followings: [
{
user:{
type: Schema.ObjectId,
ref: 'User'
},
}
],
followers: [
{
user:{
type: Schema.ObjectId,
ref: 'User'
},
}
],
}, {timestamps: true})
And I need to implement "unfollow" feature.
I am currently trying this:
try {
// check if your id doesn't match the id of the user you want to unfollow
if (user._id === current_id) {
return res.status(400).json({ error: 'You cannot unfollow yourself' })
}
// remove the id of the user you want to unfollow from following array
const query = {
_id: current_id
}
const update = {
$pull: { "followings": {"_id": user._id }}
}
const updated = User.update(query, update)
// remove your id from the followers array of the user you want to unfollow
const secondQuery = {
_id: user._id
}
const secondUpdate = {
$pull: { "followers": {"_id": current_id} }
}
const secondUpdated = User.update(secondQuery, secondUpdate)
if (!updated || !secondUpdated) {
return res.status(404).json({ error: 'Unable to unfollow that user' })
}
res.status(200).json({
update,
secondUpdate
})
}
catch (err) {
res.status(400).send({ error: err.message })
}
This gives status 200 and sends update & secondUpdate to the client,
but the actual object doesn't get deleted from the database.
What is wrong with my code?

Answer 1

If you are using mongodb native drive
You should import mongodb ObjectID. Before performing operations.
const ObjectId = require('mongodb').ObjectID;
$pull: { "followers": {"_id": current_id} }
change to:
$pull: { "followers": {"_id": new ObjectId(current_id) }

Answer 2

Thank you for your answers.
In my case, the following worked for me.
try {
// check if your id doesn't match the id of the user you want to unfollow
if (user._id === current_id) {
return res.status(400).json({ error: 'You cannot unfollow yourself' })
}
// remove the id of the user you want to unfollow from following array
const query = {
_id: current_id
}
const update = {
$pull: { followings: {_id: user._id }}
}
const updated = User.updateOne(query, update, {
safe: true
}, function(err, obj) {
console.log(err);
})
// remove your id from the followers array of the user you want to unfollow
const secondQuery = {
_id: user._id
}
const secondUpdate = {
$pull: { followers: {_id: current_id} }
}
console.log(secondQuery)
console.log(secondUpdate)
User.updateOne(secondQuery, secondUpdate, {
safe: true
}, function(err, obj) {
res.status(200).json({
obj
});
})
}
catch (err) {
res.status(400).json({ error: err.message })
}