Learning how to Use Generators with Mongoose

docker-compose.yml

# Docker-compose for setting up Mongodb server on my laptop
version: '2'

networks:
  mongodb_net:
    driver: bridge
    ipam:
      driver: default
      config:
        - subnet: 192.168.213.0/24
          gateway: 192.168.213.1
services:
    mongodb:
      image: mongo:latest
      container_name: mongodb
      networks:
        - mongodb_net
      ports:
        - 27017:27017

package.json

{
  "name": "es6-generator-mongoose-test",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "co": "^4.6.0",
    "joi": "^10.1.0",
    "mongoose": "^4.7.5",
    "mongorito": "^2.2.0"
  }
}

run.js

'use strict';

/**
 * Dependencies
 * From: https://github.com/vadimdemedes/mongorito/blob/master/examples/run.js (MIT)
 */

const co = require('co');


/**
 * Run a generator function and print errors if any
 */

function run (fn) {
	co(fn).catch(function (err) {
		console.log(err.stack);
	});
}


/**
 * Expose fn
 */

module.exports = run;

server.js

'use strict';

/* Requirements:
node v6.3.0
npm install mongoose
npm install co

This test shows how to create a function that is a generator. Function where
you can use yield keywords. 
*/
const mongoose = require('mongoose');
// Helper function for running generator functions using the 'co' package.
const run = require('./run');
// Change the Promise from the default mpromise which is deprecated
// to bluebird.
mongoose.Promise = require('bluebird');

const testme = function * () {
  // connect to a database named "examples" on localhost
  yield mongoose.connect('localhost/examples');

  // connected
  console.log('connected');

  // and disconnect
  yield mongoose.disconnect();

  // disconnected
  console.log('disconnected');
};

test_output.md

$ tree -L 1             
.
├── node_modules
├── package.json
├── run.js
└── server.js

1 directory, 3 files

$ node server.js
connected
disconnected