How to request with hasMany relation ?

I created an extension with a relation hasMany, we had modifications on tl_news.php file.

tl_news.php

PHP Code:

---

'restaurants' => array
        (
            'label'                   => &$GLOBALS['TL_LANG']['tl_news']['restaurants'],
            'exclude'                 => true,
            'filter'                  => true,
            'inputType'               => 'select',
            'foreignKey'              => 'tl_restaurants.title',
            'eval'                    => array('tl_class'=>'w50', 'multiple'=>true),
            'relation'                => array('type'=>'hasMany', 'load'=>'eager'),
            'sql'                     => "varchar(255) NULL"
        ), 


---

Now I want to get all the news by the id of a restaurant.

Is there a function to search on this field like findBy... ?

thank you,

Why not use

PHP Code:

---

\NewsModel::findByRestaurant('restaurant name'); 


---

Maybe this will help https://docs.contao.org/books/cookbook/de/Models.html. Sorry, not yet translated.