Object::model PHP Method

    public static function model($className = __CLASS__)
    {
        return parent::model($className);
    }

 protected function renderContent()
 {
     $id = isset($_GET['id']) ? (int) $_GET['id'] : 0;
     $page = isset($_GET['page']) ? (int) $_GET['page'] : 0;
     $model = GxcHelpers::loadDetailModel('Comment', $id);
     $prev_status = $model->comment_approved;
     if (isset($_POST['Comment'])) {
         $model->attributes = $_POST['Comment'];
         if ($model->save()) {
             if ($prev_status != $model->comment_approved) {
                 if ($model->comment_approved == Comment::STATUS_APPROVED) {
                     $object = Object::model()->findbyPk($model->object_id);
                     if ($object != null) {
                         $tempCommentCount = $object->comment_count;
                         $tempCommentCount++;
                         $object_comment_count = $tempCommentCount;
                         $object->save();
                     }
                 } else {
                     if ($model->comment_approved == Comment::STATUS_PENDING) {
                         $object = Object::model()->findbyPk($model->object_id);
                         if ($object != null) {
                             $tempCommentCount = $object->comment_count;
                             $tempCommentCount--;
                             $object_comment_count = $tempCommentCount;
                             $object->save();
                         }
                     }
                 }
             }
             user()->setFlash('success', t('cms', 'Updated Successfully!'));
         }
     }
     $this->render('cmswidgets.views.comment.comment_update_widget', array('model' => $model));
 }