Display only parent posts of a custom post type archive page in wordpress
My code :
$args = array(
'post_type' => 'programs',
'post_parent' => get_the_ID(),
);
$article_posts = new WP_Query($args);
if($article_posts->have_posts()) :
?>
<?php while($article_posts->have_posts()) : $article_posts->the_post();
$post_id = get_the_ID();
$post_link = get_permalink($post_id);
$post_title = get_the_title();
$featured_img_url = get_the_post_thumbnail_url(get_the_ID());
?>
<p> post </p>
<?php endwhile; ?>
<?php else: ?>
Oops, there are no posts.
<?php endif; ?>
<?php echo "</ul>";?>
Result:
"Oops, there are no posts."
According to the documentation if you only want the top level posts(i.e parents) then you would need to set the post_parent to 0 not the id of the current page.
Also check if you've set the 'hierarchical' argument to true when you registered your custom post type.
Also it's a good idea to use wp_reset_postdata function after you're done with your loop!
So your code would be something like this:
$args = array(
'post_type' => 'programs',
'post_parent' => 0,
);
$article_posts = new WP_Query($args);
echo echo "</ul>";
if($article_posts->have_posts()) :
while($article_posts->have_posts()) :
$article_posts->the_post();
$post_id = get_the_ID();
$post_link = get_permalink($post_id);
$post_title = get_the_title();
$featured_img_url = get_the_post_thumbnail_url(get_the_ID());
?>
<p><?php echo $post_title; ?></p>
<?php
endwhile;
?>
<?php
else:
?>
Oops, there are no posts.
<?php
endif;
?>
<?php echo "</ul>";
wp_reset_postdata();
post_parent argument works the other way round :
You need this arg to find all parent posts:
'post_parent' => 0, // find parents
As a (pretty clunky) memory aid: Parent post is Null /doesn't exist.
'post_parent' => get_the_ID() //find children
Query all child posts of your current post. Parent post has this ID.
See this thread:
How to query for posts (in hierarchical custom post type) that have children?