Admin::sortModel PHP Method

    public function sortModel()
    {
        if (!$this->model->hasAttribute('display_order')) {
            throw new CHttpException(400, 'This object cannot be ordered');
        }
        if (Yii::app()->request->isPostRequest) {
            $post = Yii::app()->request->getPost($this->modelName);
            $page = Yii::app()->request->getPost('page');
            if (!array_key_exists('display_order', $post) || !is_array($post['display_order'])) {
                throw new CHttpException(400, 'No objects to order were provided');
            }
            foreach ($post['display_order'] as $displayOrder => $id) {
                $model = $this->model->findByPk($id);
                if (!$model) {
                    throw new CHttpException(400, 'Object to be ordered not found');
                }
                //Add one because display_order not zero indexed.
                //Times by page number to get correct order across pages.
                $model->display_order = ($displayOrder + 1) * $page;
                if (!$model->validate()) {
                    throw new CHttpException(400, 'Order was invalid');
                }
                if (!$model->save()) {
                    throw new CHttpException(500, 'Unable to save order');
                }
            }
            $this->audit('sort');
        }
    }

 /**
  * Save ordering of the objects.
  */
 public function actionSort()
 {
     $admin = new Admin(OEModule\OphCiExamination\models\OphCiExamination_Attribute::model(), $this);
     $admin->sortModel();
 }