How do I get the objectID after I save an object in Mongoose?

Question

How do I get the objectID after I save an object in Mongoose?

var n = new Chat();
n.name = "chat room";
n.save(function(){
    //console.log(THE OBJECT ID that I just saved);
});

I want to console.log the object id of the object I just saved. How do I do that in Mongoose?

node.js
mongodb
mongoose

Answer 1

This just worked for me:

var mongoose = require('mongoose'),
      Schema = mongoose.Schema;

mongoose.connect('mongodb://localhost/lol', function(err) {
    if (err) { console.log(err) }
});

var ChatSchema = new Schema({
    name: String
});

mongoose.model('Chat', ChatSchema);

var Chat = mongoose.model('Chat');

var n = new Chat();
n.name = "chat room";
n.save(function(err,room) {
   console.log(room.id);
});

$ node test.js
4e3444818cde747f02000001
$

I'm on mongoose 1.7.2 and this works just fine, just ran it again to be sure.

Answer 2

Mongo sends the complete document as a callbackobject so you can simply get it from there only.

for example

n.save(function(err,room){
  var newRoomId = room._id;
  });

Answer 3

you can get objectid in mongoosejs after you new some model.

i'm using this code work in mongoose 4, you can try it in other version

var n = new Chat();
var _id = n._id;

or

n.save((function (_id) {
  return function () {
    console.log(_id);
    // your save callback code in here
  };
})(n._id));