/**
  * List course descriptions.
  * 
  * @param array messages 
  */
 public function index()
 {
     $course = Request::get_course_key();
     $repo = Glossary::repository();
     $items = $repo->find_by_course($course);
     $view = Request::get_view();
     Session::write(Request::PARAM_VIEW, $view);
     $data = (object) array();
     $data->items = $items;
     $data->sort = $sort;
     $data->view = $view;
     $this->render('index', $data);
 }