Mongoose request for id field returns id and _id

Question

In my Mongoose schema I have an id field which has a unique ID for each document. This runs off the same system used by the default _id field like so:

var JobSchema = new mongoose.Schema({
  id: { type:String, required:true, unique:true, index:true, default:mongoose.Types.ObjectId },
  title: { type: String },
  brief: { type: String }
});

module.exports = mongoose.model("Job", JobSchema);

Now, if I query the schema to get id and title I'd do it like this:

Job.find().select("id title").exec(function(err, jobs) {
  if (err) throw err;
  res.send(jobs);
});

However, I've found this returns id and title as expected, but it also return the default _id field. Why is that and how do I stop it?

Answer 1

Inside the find() function you can pass two parameters (criteria and projection). Projection are the fields that you want (or not). In your case you can change your code to

Job.find({}, {_id:0, id: 1, title: 1}, function(err, jobs) {
    if (err) throw err;
    res.send(jobs);
});

and it should do it.

Answer 2

There is an option to prevent the id on schema level. For me this worked perfectly fine.

new Schema({ name: String }, { id: false });

Mongoose Docs