Mongoose 3.8.9 troubleshooting

mod.js

var util = require('util');

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var _ = require('lodash');
var Q = require('q');

var accountSchema = Schema({
  username: String,
  contacts: [{
    account: { type: Schema.Types.ObjectId, ref: 'Account'},
    name: String
  }]
});

var Account = mongoose.model('Account', accountSchema);

var abeAcc = new Account({ username: 'abe' });
var bobAcc = new Account({ username: 'bob' });

function run() {
  Q.ninvoke(abeAcc, 'save').then(function() {
    return Q.ninvoke(bobAcc, 'save').then(function(storedAccArray) {
      return Q.ninvoke(Account,
                       'findOneAndUpdate',
                       { username: 'abe'},
                       { $push: {'contacts': { account: storedAccArray[0]._id, name: 'bob'}}},
                       { 'new': true})
        .then(function(abeWithContacts) {
          // console.log(util.inspect(abeWithContacts));
          // console.log(util.inspect(storedAccArray));
          var match = _.find(abeWithContacts.contacts, { 'account': storedAccArray[0]._id });
          console.log('the next row should print a result');
          console.log(match);

          var filteredIdMatches = abeWithContacts.contacts.filter(function(arrayElem) {
            return arrayElem._id === storedAccArray[0]._id;
          });
          console.log(util.inspect(filteredIdMatches));

          var filteredNameMatches = abeWithContacts.contacts.filter(function(arrayElem) {
            return arrayElem.name === storedAccArray[0].username;
          });
          console.log(util.inspect(filteredNameMatches));
        });
    });
  }).then(function() {
    mongoose.connection.close();
  }).done();
}

mongoose.connect('mongodb://localhost/troubleshoot');
mongoose.connection.on('open', run);

package.json

{
  "dependencies": {
    "mongoose": "3.8.9",
    "lodash": "2.4.1",
    "q": "1.0.1"
  }
}