Reply To: custom post type ui with acf field with unique value

• hadimahoor

• November 2, 2017 at 11:43 pm

hi
i have a custom post type “professor” and a relationship field ( refer to “person” custom post type ) with name of “persona” but this code did not work

add_filter('acf/validate_value/name=persona', 'require_unique', 10, 4);
function require_unique($valid, $value, $field, $input) {
  if (!$valid) {
    return $valid;
  }
  // get the post id
  // using field key of post id field
 
  // query existing posts for matching value
  $args = array(
    'post_type' => 'professor',
    'posts_per_page' => 1, // only need to see if there is 1

    'meta_query' => array(
      array(
        'key' => 'persona',
        'value' => $value
      )
    )
  );
  $query = new WP_Query($args);
  if (count($query->posts)){
    $valid = 'This Value is not Unique';
  }

  return $valid;
}