I’ve a custom post type called “Book”, for which I link custom posts type called “Author” with ACF relationship field.
I would like to order the book posts by their linked author name (the title of the custom post).
What’s the better way to do that?
You can achieve this by hooking into the acf/fields/relationship/query filter. You can modify the $args array as follows:
function my_relationship_query( $args, $field, $post )
// increase the posts per page
$args['posts_per_page'] = 25;
$args['orderby'] = 'title';
// filter for a specific field based on it's name
add_filter('acf/fields/relationship/query/name=my_select', 'my_relationship_query', 10, 3);