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Relationship field filter

  • I am trying to dynamically select posts in an ACF relationship field.

    This code block creates an array of post IDs to display in the relationship field:

    function npep_students_to_show_have_rows_two() {
    $student_newest = '';
    if (have_rows('npep_student_matches', $post>ID)) {
          while(have_rows('npep_student_matches', $post>ID)) {
            $student_newest[] = get_sub_field('npep_student');
    return $student_newest;
    $newest = npep_students_to_show_have_rows_two();

    I am able to use $newest in a standard WP_Query perfectly. Such as

    $the_query = new WP_Query( array('post_type' => 'student', 'posts_per_page' => -1, 'post__in' => $newest ));

    However, when I try to use this in the ACF filter function it does not work. I know the filter works because when I set the array manually it works as expected.

    add_filter('acf/fields/relationship/query/name=npep_interviewees', 'npep_limit_students', 10, 3);
    function npep_limit_students( $args, $field, $post_id ) {
        $newest = npep_students_to_show_have_rows_two();    
        $args['post__in'] = $newest;
    //  $args['post__in'] = array(71,127,130);      
        return $args;

    I am confused 🙁

  • I abandoned ship on this one, but was able to use Gravity forms to dynamically set options for submitting.

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