Reply To: Update Taxonomy of posts selected by acf relation field

• John Huebner

• September 23, 2019 at 12:17 am

There is an error in my code I gave you

This line should be causing an error in php

$term_id = intval(str_replace('term_', $post_id));

it should be

$term_id = intval(str_replace('term_', '', $post_id));

I also set up a test using posts and categories, this is working as expected

add_filter('acf/save_post', 'category_list_save', 20, 1);
function category_list_save($post_id) {
  $posts = get_field('posts', $post_id);
  $term_id = intval(str_replace('term_', '', $post_id));
  if ($posts) {
    foreach ($posts as $post) {
      // make sure "list" is the taxonomy name and not the term name
      wp_set_post_terms($post->ID, $term_id, 'category', true);
    }
  }
}

It it’s still not working for you make sure that your taxonomy and post type are attached. https://codex.wordpress.org/Function_Reference/register_taxonomy_for_object_type