I got category_to_news and news_main table

category_to_news : news_id (int),name (varchar),title (timestamp)

news_main : id (int),title (varchar),image (int),created_at (varchar)

class Newsmain extends Eloquent {
    protected $table = 'news_main';
}

class Categorytonews extends Eloquent {
    protected $table = 'category_to_news';
 	public $uniquekey = 'title';
	public function Newsmain()
    {
        return $this->belongsTo('Newsmain');
    }
	
}

how to return by news_main's field and category_news's field ? I've tried this method and it's not work

$posts = Categorytonews::with(array(
    'Newsmain' => function($query)
    {
        $query->orderBy('id', 'DESC')->select(array('title', 'id', 'created_at', 'image'));
    }
    ))
    ->get( );