Parallel promises

promise-parallel.js

actions: {
  submitForm: function() {
    var model = this.store.createRecord('post');
    
    this.resolveKeywords(controller.get('postKeywords')).then(function(keywords) {
      model.get('keywords').pushObjects(keywords);
      return model.save();
    }).then(function() {
      controller.transitionToRoute('post', model);
    });
    
  });
},

resolveKeywords: function(keywords) {
  var controller = this;

  return new Ember.RSVP.Promise(function(resolve) {

    var promises = keywords.map(function(item) {
      return controller.resolveSingleKeyword(item);
    });

    Ember.RSVP.all(promises).then(function(keywords) {
      resolve(keywords);
    });

  });
},