protected function breadcrumbs()
{
parent::breadcrumbs();
$course = ORM::factory('course', Session::instance()->get('course_id'));
if (!$this->request->is_ajax() && $this->request->is_initial()) {
Breadcrumbs::add(array('Courses', Url::site('course')));
Breadcrumbs::add(array(sprintf($course->name), Url::site('course/summary/id/' . $course->id)));
Breadcrumbs::add(array('Exercises', Url::site('exercise')));
}
}
