Trying to get file name

Question

I have a custom meta box to store pdf files. For this input, I'm using type="media" to acess wordpress media library.

Now I can't get the file name. Here is my entire loop:

<ul>
        <?php
        $args_artigos = array('post_type' => 'artigo','posts_per_page' => -1);
        $artigos_posts = new WP_Query($args_artigos);

        if($artigos_posts->have_posts()) : 
           while($artigos_posts->have_posts()) : 
           $artigos_posts->the_post();
        ?>
        <li>
        <a href="<?php the_permalink(); ?>" class="artigos-titulo"><?php the_title() ?></a>
        <span class="artigos-autor"><?php echo esc_html( get_post_meta( get_the_ID(), 'autor', true ) ); ?></span>
        <?php $filename = basename ( get_attached_file( get_the_ID() ) ); echo $filename; ?>


        </li>

        <?php endwhile; else: ?>
           Oops, there are no posts.
        <?php endif; ?>
        </ul>

But it's return no data.

Answer 1

Your meta field contains the ID of the attachment, you need to fetch that ID, then get the filename using that attachment ID.

$doc_id = get_post_meta( get_the_ID(), 'pdf', true );
$filename = basename( get_attached_file( $doc_id ) );
echo $filename;