A simple usage of Mongoose and its promise API

app.js

'use strict';

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test2');

const db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function dbOpenCB(callback) {
  console.log('open callback called');
});

const postSchema = mongoose.Schema({
  title: String,
  body: String,
  author: {
    name: String
  }
});

const Post = mongoose.model('Post', postSchema);

const newPost = new Post({
  title: 'foo',
  body: 'bar',
  author: {
    name: 'Joe Blow'
  }
});

const closeDB = db.close.bind(db);
newPost.save()
  .then(function saveCB(newPost) {
    console.log('newPost:');
    console.dir(newPost);
  })
  .then(function() {
    return Post.where('title', /^f/).exec();
  })
  .then(function findCB(posts) {
    console.log('Posts:');
    console.dir(posts);
  })
  .then(closeDB, closeDB)
  .end();