Using the Q promise library with Parse.com Cloud Code to ease offline development and testing.

main.js

/*globals Parse*/

/**
 * Playing with using the Q promise library with Parse.com
 * to ease offline development and testing.
 *
 * http://documentup.com/kriskowal/q/
 *
 * Was tricky to mock-up Parse's promise implementation.
 *
 * Author: Brian Gershon <brian.five@gmail.com>
 */

var q = require('cloud/q.js');

function doSimpleStuff() {
  //return q.reject('ERR ERR');
  return q('simple hi');
}

function doMoreExoticStuff() {
  return q.fcall(function () {
    return 'exotic hi';
  });
}

function doCrazyStuff() {
  var defer = q.defer();
  defer.promise.then(function success(message) {
    console.log('About to say hello. Message: ' + message);
    //return 'bye';
  }, function error(reason) {
    throw new Error(reason);
    //return 'error ' + reason;
  });

  // play with resolving or rejecting this promise
  defer.resolve('resolve me');
  // defer.resolve('toast');

  return defer.promise;
}

Parse.Cloud.define("hello", function (request, response) {
  doSimpleStuff()
  .then(doMoreExoticStuff)
  .then(doCrazyStuff)
  .then(
    function success(value) {
      response.success("Hello world SUCCESS! " + value);
    },
    function error(reason) {
      response.error('Hello world FAILURE ' + reason);
    }
  )
  .fin(function () {
    console.log('FINALLY!');
  })
  .done();
});