/**
  * This method controls what happens when you move to /note/edit(/XX) in your app.
  * Shows the current content of the note and an editing form.
  * @param $note_id int id of the note
  */
 public function edit($material_id)
 {
     // All methods inside this controller are only accessible for admins (= users that have role type 7)
     Auth::checkAdminAuthentication();
     $this->View->render('material/edit', array('material' => materialModel::getMaterial($material_id)));
 }