route.js

import Ember from 'ember';

var debug = Ember.Logger.debug;

// store/checkout/success
// ember-data 1.0.0-beta.19.1
// ember 1.11.3
export default Ember.Route.extend({
  setupController: function (controller) {
    debug('finding last successful order');
    // this.store.all('order') => [{SUCCESSFUL_ORDER}, {NEW_ORDER(NO_ID)}]
    // we need to reverse the orders and get the first one with ID (the last order)
    // so we can get the last successful checkout.
    // why? because this way we ensure that if the customers make some simultaneous
    // checkouts they would see the last order and not the firstone.
    // this.store.all('order').toArray().reverseObjects()
    // this.store.all('order').reverseObjects()
    // this.store.all('order’).get('reverseObjects')
    // => internalModel.getRecord is not a function
    var order = _.find(this.store.all('order').toArray().reverseObjects(), function (storeOrder) {
      return storeOrder.get('id');
    });
    controller.set('order', order);
  }
});