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Order by option within a post object field

  • I have a post type of listing. In each listing is post object named package that is connected to another post type of package. There is then a field attached to each package named sort. I need to be able to use the sort value to order the listings.

    function alter_query($query) {
        global $wp_query;
        if( $query->is_main_query() && is_post_type_archive( 'listing' ) ) {
            // Package is a post object attached to the listing post type. 
            // It allows you to select from a packages post type.
            $package = get_field('package');
            // Sort is a numeric field attached to the packages post type.
            $sort = get_field('sort',$package->post_ID);
            $query->set('orderby', array( 
            remove_all_actions ( '__after_loop');
  • You cannot sort posts by a meta value attached to a different post. You can only sort posts by meta fields attached to the post you are sorting. There simply is not a way to do this in WP.

    posts you are sorting
        => meta values of these posts <= you can sort by these
        => Related post
           => meta values of related posts <= you cannot sort the first level posts by this
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