change.js

var ChangeController = Em.Controller.extend({
  changesController: Em.inject.controller('changes'),
  admin: Em.computed.reads('changesController.model'),
  change: Em.computed.reads('model'),

  recordPageLoad: function() {
    this.trackEvent('marketing-event', {
      owner: 'marketing',
      action: 'visited',
      place: 'change-page',
      changeId: this.get('change').id // this.get('change') is null
    });
  }.on('init')
});

export default ChangeController;