class IdiormConnectionFactory extends \Nette\Object
{
    public static function create()
    {
        ORM::configure('mysql:host=localhost;dbname=language_exchange');
        ORM::configure('username', 'root');
        ORM::configure('password', 'root');

        return ORM::get_db();
    }
}

###

services:
    idion: IdiormConnectionFactory::create()