Reply To: How to use WP Term Meta, the easy way!

• jave.web

• March 10, 2017 at 1:44 pm

Thanks Edir, you’ve inspired me to write a more general version.
This version is based on “post_id” provided by ACF, which is actually an ACF-post_id (not a real wp_posts table ID)
and also based on get_field() documentation, which is pretty steady in ACF-post_id formats.
(Dis)advantage: uses global variable for taxonomy caching.

//returns BOOLEAN false or a term id (int)
$GLOBALS['taxonomies_for_acf_term_meta_filter'] = [];
function my_acf_get_term_id_from_acf_post_id( $acf_post_id ){
  if( is_numeric($acf_post_id) ) return false; //not a special ID...

  if( empty($GLOBALS['taxonomies_for_acf_filter']) )
    $GLOBALS['taxonomies_for_acf_filter'] = get_taxonomies();
  
  $taxonomies = &$GLOBALS['taxonomies_for_acf_filter']; //shorthand
  $term_id = 0;
  foreach( $taxonomies as $taxonomy ){
    //special id is in format somestring_ID
    $term_id = str_replace( $taxonomy.'_', '', $acf_post_id );

    //If not numeric at all, or something is removed while cast type to int (must use "!=" !!!!!)
    //=> not a proper ID... => nothing to do here...
    if(  ! is_numeric($term_id) || ( ((int)$term_id) != $term_id )  ) continue;
      
    $term_id = (int)$term_id;
    break;     
  }
  
  if( $term_id < 1 ) return false; //not a proper ID...
  
  return $term_id;
}
function my_acf_update_term_meta($value, $post_id, $field) {
  //FILTER! ===> MUST ALWAYS RETURN $value !

  $term_id = my_acf_get_term_id_from_acf_post_id( $post_id );
  if( $term_id === false ) return $value; //not a proper ID... MUST USE "===" !!!!!
  
  update_term_meta($term_id, $field['name'], $value);
	
  return $value;
}
add_filter('acf/update_value', 'my_acf_update_term_meta', 10, 3);
add_filter('acf/update_value', 'my_acf_update_term_meta', 10, 3);

function my_acf_load_term_meta($value, $post_id, $field) {
  //FILTER! ===> MUST ALWAYS RETURN $value !

  $term_id = my_acf_get_term_id_from_acf_post_id( $post_id );
  if( $term_id === false ) return $value; //not a proper ID... MUST USE "===" !!!!!
	
  $value = get_term_meta($term_id, $field['name'], true);
	
  return $value;
}
add_filter('acf/load_value', 'my_acf_load_term_meta', 10, 3);
add_filter('acf/load_value', 'my_acf_load_term_meta', 10, 3);