Reply To: Save ACF relationship (name) value to ACF text field

• albertvisuals

• August 7, 2021 at 4:16 pm

Hello John!

Thanks very much for your help!

I have tried to set up a function with your changes as follows:

<?php

//Make special artist field autosave for sorting
function write_artist_name_to_hidden( $post_id ) {

//Get the value of the relationhip field, unformatted, from the project post being saved.
$kuenstlerinnen_id = get_field ('project_to_kunstlerin', $post_id, false);
//The above value could be an array
if (is_array('kuenstlerinnen_id')) {
    $kuenstlerinnen_id = kuenstlerinnen_id[0];
  }

  //get the last name field from the other post

  $artist_nachname = get_field('artist_nachname', $kuenstlerinnen_id);
//update the field on the project with this value

update_field('project_kunstlerin_nach_name_sort', $artist_nachname, $post_id);

  }
  add_action('acf/save_post', 'write_artist_name_to_hidden', 11);

Sadly I am doing something wrong here, as get several warnings when I try to update a post:
Warning: Illegal offset type in isset or empty in /Users/sebastianalbert/Local Sites/fotohof-calling/app/public/wp-content/plugins/advanced-custom-fields-pro/includes/local-meta.php on line 195

Warning: Illegal offset type in isset or empty in /Users/sebastianalbert/Local Sites/fotohof-calling/app/public/wp-content/plugins/acf-extended/includes/core/meta.php on line 168

Warning: Illegal offset type in isset or empty in /Users//Local Sites/fotohof-calling/app/public/wp-content/plugins/advanced-custom-fields-pro/includes/local-meta.php on line 195

Warning: Illegal offset type in isset or empty in /Users//Local Sites/fotohof-calling/app/public/wp-content/plugins/acf-extended/includes/core/meta.php on line 168

Warning: Cannot modify header information – headers already sent by (output started at /Users//Local Sites/fotohof-calling/app/public/wp-content/plugins/advanced-custom-fields-pro/includes/local-meta.php:195) in /Users//Local Sites/fotohof-calling/app/public/wp-includes/pluggable.php on line 1340

Warning: Cannot modify header information – headers already sent by (output started at /Users//Local Sites/fotohof-calling/app/public/wp-content/plugins/advanced-custom-fields-pro/includes/local-meta.php:195) in /Users//Local Sites/fotohof-calling/app/public/wp-includes/pluggable.php on line 1343

Do you have any idea what I am doing wrong here? I am pretty new to the php stuff.
Thanks again for your help!