public function execute($request)
 {
     $setting = QubitSetting::getById($this->request->id);
     $this->forward404Unless($setting);
     // check that the setting is deleteable
     if ($setting->isDeleteable()) {
         $setting->delete();
     }
     // TODO: else populate an error?
     $this->refreshSettings();
     $this->redirect('settings/list');
 }