How to remove Object from array using mongoose

Question

I'm trying to remove an object from an array in a document using mongoose.

The Schema is the following:

var diveSchema = new Schema({
//irrelevant fields
    divers: [{
        user: { type: Schema.Types.ObjectId, ref: 'User', required: true },
        meetingLocation: { type: String, enum: ['carpool', 'onSite'], required: true },
        dives: Number,
        exercise: { type: Schema.Types.ObjectId, ref: 'Exercise' },
    }]
});

a possible entry can be

{
    //irrelevant fields
    "divers": [
        {
            "_id": "012345678",
            "user": "123456789",
            "meetingLocation": "carpool",
            "exercise": "34567890",
        },
        {
            "_id": "012345679",
            "user": "123456780",
            "meetingLocation": "onSite",
            "exercise": "34567890",
        }
    ]
}

Say I want to remove the entry where user is 123456789 (note I do not know the _id at this point).

How do I do this correctly?

I tried the following:

        var diveId = "myDiveId";
        var userIdToRemove = "123456789"
        Dive.findOne({ _id: diveId }).then(function(dive) {
            dive.divers.pull({ user: userIdToRemove });
            dive.save().then(function(dive) {
                //do something smart
            });
        });

This yieled no change in the document.

I also tried

Dive.update({ _id: diveId }, { "$pull": { "divers": { "diver._id": new ObjectId(userIdToRemove) } } }, { safe: true }, function(err, obj) {
    //do something smart
});

With this I got as result that the entire divers array was emptied for the given dive.

Answer 1

What about this?

Dive.update({ _id: diveId }, { "$pull": { "divers": { "user": userIdToRemove } }}, { safe: true, multi:true }, function(err, obj) {
    //do something smart
});

Answer 2

I solve this problem using this code-

 await Album.findOneAndUpdate(
    { _id: albumId },
    { $pull: { images: { _id: imageId } } },
    { safe: true, multi: false }
  );
  return res.status(200).json({ message: "Album Deleted Successfully" });