delete child element from database

I have a table menu and a "child" table rssold that has a related field mn_id with menu.id

So I want when a menu item is deleted to delete all rssold related data

So at menu model I have this code that it does not seem to work,how can I solve it?

public function beforeDelete()

{

    if (parent::beforeDelete()) {

        Yii::$app->db->createCommand('delete from rssold where  mn_id=:id')

                ->bindParam(':id', $this->id ) 

                ->execute();

        return true;

    } else {

        return false;

    }

}

Also the controller code

public function actionDeletecat($param) {

         if ($param == null || !is_numeric($param)) {

            throw new \yii\web\HttpException(404, 'The requested Item could not be found.');

            die();

        }

        $model = \app\models\Menu::find()->where(['id' => $param])->one();

        Yii::$app->db->createCommand('delete from menu where  id=:id')

                ->bindParam(':id',$param ) 

                ->execute();

        $this->redirect(Url::to(['manager/cats', 'param' => $model['type']]), 302);

    }

I add the below code at controller

Yii::$app->db->createCommand('delete from rssold where  mn_id=:id')

                ->bindParam(':id', $param ) 

                ->execute();