facebook_batch_publishing.js

/**
   * @ngdoc function
   * @name publishToFacebookGroups
   * @description publishes a deal as photos to an array of fb groups
   * @param {resource} deal The deal to share
   * @param {array} groups An Array of groups to share on
   * @returns {boolean} A promise to know later if the deal sharing process failed or succeeded
   */
  function publishToFacebookGroups(deal, groups) {
    $rootScope.currentUser.balance -= groups.length;
    var deferred = $q.defer();

    // The Full Sharing Payload (Image/Post)
    var sharingPayload = {
      hLink:        window.location.toString().split('-')[0], //TODO: Try without slug
      hPicture:     deal.cover_photo_url,
      hName:        deal.title,
      hDescription: deal.description,
      hMessage: $compile($templateCache.get('partials/foo.html'))(deal)
    };

    // Initializing Batch Processing Job Queue
    batch_data = [];

    // Creating Batch Processing Jobs
    for (i=0;i<groups.length;i++) {

      // Options for each job
      var options = {
        method: 'post',
        relative_url: group[i].url + "/photos", // e.g: '/groups/:id/photos'
        // Serializing json to query string via $.param
        body: $.param({
          message: sharingPayload.hMessage,
          url: sharingPayload.hPicture
        })
      }
      // Pusing Job Options to the Queue
      batch_data.push(options);
    }

    // Doing the Actual Request with Facebook API
    FB.api("/", 'post', {
      batch: batch_data // The batch we prepared above
    }, function(fbResult) {
      var results = [];
      // if request succeed we should recieve an Array
      if (fbResult.length) deferred.resolve(fbResult); //TODO: discuss what to send

      // Iterating over returned posts ids from facebook
      for (i=0;i<fbResult.length;i++) {
        // Parsing Facebook Resource JSON
        var fbResource = JSON.parse(fbResult[i].body);
        // if it's a real resource push it to the server
        //TODO: Why we could recieve something without id !? What is it ?
        if (fbResource['id']) {
          results.push(fbResource['post_id']); // we just need post id to attach it to our deal Record in DB
        }
      }

      // Pushing Post Ids to our server to be attached with the deal
      $.post( SETTINGS.mainURL + '/deals/' + deal.id + '/fb_groups_shared.json',{
          share_data: results
        }
      ).done(function(res) {
        deferred.resolve(res); //TODO: discuss what to send
      });

    });

  }