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Order by relationship post title

  • Hi,
    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?

  • Hi @cecilehabran

    Thank you for the question.

    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';
        return $args;
    // filter for a specific field based on it's name
    add_filter('acf/fields/relationship/query/name=my_select', 'my_relationship_query', 10, 3);

    You can have a look at the following resource page

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