private function appendDefaultAuthor(array $config, ContainerBuilder $container)
    {
        $mapping = $container->getParameter('sulu_document_manager.mapping');
        foreach ($mapping as $key => $item) {
            if ('article' === $item['alias']) {
                $mapping[$key]['set_default_author'] = $config['default_author'];
            }
        }

        $container->setParameter('sulu_document_manager.mapping', $mapping);
        $container->setParameter('sulu_article.default_author', $config['default_author']);
    }