How to remove element from an array in mongoose - express

Question

I have the following Schema:
// userSchema
{
_id: Schema.ObjectId,
email: { type: String, unique: true },
password: String,
boxes: [boxSchema]
}
// boxSchema
{
_id: Schema.ObjectId,
boxId: { type: String, unique: true },
boxName: String
}
I have data like this:
{
_id: random,
email: em#i.l,
password: hash,
boxes: [{ "boxId" : "box1", "boxName" : "Box 1"},
{ "boxId" : "box2","boxName" : "Box 2"},
{ "boxId" : "box3","boxName" : "Box 3"}]
}
I am trying to remove an element from boxes array with boxId: box1 and the code I tried was this:
User.findOne({
_id: req.body.id
})
.then(function (user) {
if (user) {
for (i in user.boxes)
if (user.boxes[i].boxId === 'box1')
user.boxes[i].remove();
res.json('removed');
}
})
.catch(function (err) {
....
});
But what happens is that it removes all the boxes which is residing, instead of the boxId: box1

Answer 1

What about using filter
User.findOne({
_id: req.body.id
})
.then(function (user) {
if (user) {
user.boxes = user.boxes.filter(function(box){
return box.boxId !== 'box1'
})
res.json('removed');
}
})
.catch(function (err) {
....
});

Answer 2

There are many ways to remove element from the array and are as follows:
1) Delete(): using this function will remove the element but will not change the array size and keep blank object after removal of element.
2)splice(): It works similar to delete() but remove blank places in array after removal of element.
3)filter(): It takes function as an argument and removes the element efficiently.