public function actionManage()
 {
     $item = $this->getItem();
     $assigned = $this->getAssigned($item->name);
     $model = new AuthAssignment();
     if (isset($_POST['delete_AuthAssignment'])) {
         foreach ($_POST['AuthAssignment'] as $delete) {
             if ($delete['_delete']) {
                 $model->deleteAll('userid=:userid', array(':userid' => $delete['userid']));
             }
         }
         $this->redirect(array('view', 'name' => $item->name));
     } elseif (isset($_POST['AuthAssignment'])) {
         $model->attributes = $_POST['AuthAssignment'];
         $model->itemname = $item->name;
         if ($model->save()) {
             $this->redirect(array('view', 'name' => $item->name));
         }
     }
     $this->render('manage', array('model' => $model, 'item' => $item, 'assigned' => $assigned));
 }