[symfony-users] How to save many to many relationship without embedded forms?

I've a situation where two classes are related through a third class (m-2-m relationship). For instance, an Article can have many related articles. 

So I have a third class for instance ArticleRelated, corresponding to an article_related table with an article_id and a article_related_id columns. 

Now I've a form where for an article I display a doubleSelectList with all associated articles to the edited one:

  $this->widgetSchema['related']  = new sfWidgetFormPropelChoice(array(  

 'choices'=>ArticlePeer::retrieveArticles(),  

 'model' => 'Article'  

));

  $this->widgetSchema['related']->setOption('renderer_class', 'sfWidgetFormSelectDoubleList');

where ArticlePeer::retrieveArticles is:

public static function retrieveArticles(Criteria $c=null)

{

  if(!$c)  $c = new Criteria();

  $c->addAscendingOrderByColumn(ArticlePeer::TITLE); 

  $articles = ArticlePeer::doSelect($c);

  $arr_articles= array();

  foreach ($articles as $article) {

    $arr_articles[$article->getId()] = $article->getTitle();

  }

  return $arr_articles;

}

Now when I save my article, I want also to save this relationship which doesn't get saved automatically since it is not part of the model Article .. how I do that?

thanks

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