public function actionEdit($id)
 {
     $model = Wiki::model()->findByPk($id);
     if (!$model) {
         $model = new Wiki();
         $model->id = $id;
     }
     if (!empty($_POST['Wiki'])) {
         if (!empty($_POST['Wiki']['text'])) {
             $model->text = $_POST['Wiki']['text'];
             if ($model->save()) {
                 $this->redirect(array('view', 'id' => $id));
             }
         } else {
             Wiki::model()->deleteByPk($id);
         }
     }
     $this->render('edit', array('model' => $model));
 }