Mongoose: Remove object from array based on ID (Cast Error)

Question

I have a model that looks like this:

mongoose.Schema({
  username: String,
  posts: [{ type: Schema.Types.ObjectId, ref: \'Post\' }]
});

I have

Answer 1

In order to make a research with an id in a collection you need to create a new ObjectId and then pass the id into it.

app.delete('/post', function(req, res) {
    User.findOne({ _id: _id: ObjectId (req.user._id)}, function(err, result) {
        result.pull({ _id: ObjectId (req.body.post_id) });
    });
 });