Mongo connection using bluebird promisify and connection disposer

mongo-bluebird-disposer.js

'use strict';
const Promise = require('bluebird');
const mongoClient = require('mongodb').MongoClient;

const url = 'mongodb://localhost:27017/test';

Promise.using(getMongoConnection(url), conn => {
  return conn.collection('restaurants')
    .find().limit(10).toArray()
    .then(out => console.log(out));
});

function getMongoConnection(url) {
  return mongoClient.connect(url, { promiseLibrary: Promise })
    .disposer(conn => conn.close())
}