Profile: Ricardo Almeida

add_action( 'toolset_association_created', 'toolset_number_child_posts', 10, 3 );
function toolset_number_child_posts( $relationship_slug, $parent_id, $child_id ) {
  // apply auto number to bilhete posts that are children of sorteio posts
  if( get_post_type($parent_id)=='sorteio' && get_post_type($child_id)=='bilhete' ) {
    // get 2 most recent sibling bilhete posts
    $bilhete_args = array(
      'numberposts'           =>   2,
      'post_type'             =>   'bilhete',
      'orderby'               =>   'post_date',
      'order'                 =>   'DESC',
      'toolset_relationships' => array(
        'role'          => 'child',
        'related_to'    => $parent_id,
        'relationship'  => 'sorteio_bilhete'
      ),
    );
    $bilhetes_query = new WP_Query( $bilhete_args );
    $bilhetes = $bilhetes_query->posts;
  // don't update existing auto-numbering
    $this_id = get_post_meta( $bilhetes[0]->ID, 'wpcf-bilhete-number', true);
    if ( $this_id ) {
      return;
    }
 
    $last_id = isset($bilhetes[1]) ? get_post_meta( $bilhetes[1]->ID, 'wpcf-bilhete-number', true) : 0;
 
    $last_id++;
    add_filter('wpcf_fields_postmeta_value_save' , function( $value, $type, $slug, $cf, $obj ) use ( $child_id, $last_id ) {
        if ( $obj->post->ID === $child_id && 'bilhete-number' === $slug ) {
            return $last_id;
        }
        return $value;
    }, 10, 5 );
  }
}