I’m having the same exact problem you have but on my archive-custom-post-type.php page with Advanced Custom Fields Pro latest version.
This is the code i’m using:
<section id="debates-home">
<?php
$the_query = new WP_Query( array( 'post_type' => 'debate' , 'orderby' => 'date', 'posts_per_page' => 2 ) );
if ( $the_query->have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post();
$term = wp_get_post_terms($post->ID, 'area', array("fields" => "names"));
$term_slug = wp_get_post_terms($post->ID, 'area', array("fields" => "slugs"));
?>
<article>
<?php the_post_thumbnail(); ?>
<div class="info-debate">
<a class="category-link" href="<?php echo get_site_url(); ?>/area/<?php echo $term_slug[0] ?>/?post_type=debate"><?php echo $term[0]; ?></a>
<h3><a href="<?php the_permalink(); ?>" title="Ver debate: <?php the_title(); ?>"><?php the_title(); ?></a></h3>
<?php
$posts = get_field('columnas_del_debate');
if( $posts ): ?>
<ul>
<?php foreach( $posts as $post): ?>
<?php setup_postdata($post); ?>
<li>
<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_post_thumbnail('thumb'); ?></a>
<span class="tooltip">
<em><?php the_title(); ?></em><br> <?php the_field('autor_de_columna'); ?>
</span>
</li>
<?php endforeach; ?>
</ul>
<?php wp_reset_postdata(); ?>
<?php endif; ?>
</div>
</article>
<?php endwhile; ?>
<?php wp_reset_postdata(); ?>
<?php else : ?>
<p><?php _e( 'Sorry, no posts matched your criteria.' ); ?></p>
<?php endif; ?>
</section>
The code works fine on my index.php and will break on archive-custom-post-type.php page. The only difference in the code on the archive page is that the loop is just the plain version with no args since I don’t need to modify the loop.
If turn wp_debug on i’ll see the following error on my index.php:
Notice: Trying to get property of non-object in /wp-includes/query.php on line 4618
Notice: Trying to get property of non-object in /wp-includes/query.php on line 4620
Notice: Trying to get property of non-object in /wp-includes/query.php on line 4622
Notice: Trying to get property of non-object in /wp-includes/query.php on line 4623
Notice: Trying to get property of non-object in /wp-includes/query.php on line 4631
Notice: Trying to get property of non-object in /wp-includes/query.php on line 4646
I tried what Elliot said before and ACF seems to be working fine cause the array with the related posts appears within the print_r.
Is there a way to use setup_postdata inside the loop on an archive-custom-post-type.php page?
Thanks!
PD: I lost my old forum account, dont know why? Was the forum reset or something?
