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

mongoose.connect('mongodb://localhost/mtc-test');

var youTubeSchema = Schema({
    id: String,
    _trailer: { type: Schema.Types.ObjectId, ref: 'Trailer' }
});

var postersSchema = Schema({
    posters: String,
    _trailer : { type: Schema.Types.ObjectId, ref: 'Trailer' }
});

var trailerSchema = Schema({
    timestamp: String,
    _youtube : { type: Schema.Types.ObjectId, ref: 'YouTube' },
    _posters : { type: Schema.Types.ObjectId, ref: 'Posters' }
});

var YouTube  = mongoose.model('YouTube', youTubeSchema);
var Posters = mongoose.model('Posters', postersSchema);
var Trailer = mongoose.model('Trailer', trailerSchema);

var trailer = new Trailer({
    timestamp: new Date()
});

var youtube = new YouTube({
    id: "rTCxSguAmjQ",
    _trailer: trailer._id
});

var posters = new Posters({
    posters: "4j3h34hg34ygyu34gkj43h.jpg",
    _trailer: trailer._id
});

trailer.save(function (err) {
    //if (err) return handleError(err);

    youtube.save(function (err) {
        //if (err) return handleError(err);
    });

    posters.save(function (err) {
        //if (err) return handleError(err);
    });
});

Trailer.update({_id: trailer._id}, {_youtube: youtube._id, _posters: posters._id}, {upsert: true}, function (err) {
    //if (err) return handleError(err);
});

Trailer
    .findOne({ _id: trailer._id })
    .populate('_youtube _posters')
    .exec(function (err, trailer) {
        //if (err) return handleError(err);
        console.log(trailer);
    });