Reply To: Accept only unique values

• ma2n13

• September 29, 2017 at 5:00 am

where do I put these scripts?

add_filter('acf/load_field/name=hidden_post_id', 'make_hidden_post_id_readonly');
function make_field_readonly($field) {
  // sets readonly attribute for field
  $field['readonly'] = 1;
  return field;
}

add_filter('acf/load_value/name=hidden_post_id', 'set_hidden_post_id_value'), 10, 3);
function set_hidden_post_id_value($value, $post_id, $field) {
  // set the value of the field to the current post id
  return $post_id;
}

add_action('admin_head', 'hide_hidden_post_id');
function hide_hidden_post_id() {
  ?>
    <style type="text/css">
      /* the field key for the post id field */
      div[data-key="field_566aa87938bba"] {
        display: none;
      }
    </style>
  <?php 
}

add_filter('acf/validate_value/name=book_number', 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
  $post_id = $_POST['acf']['field_566aa87938bba'];
  // query existing posts for matching value
  $args = array(
    'post_type' => 'post',
    'posts_per_page' = 1, // only need to see if there is 1
    'post_status' => 'publish, draft, trash',
    // don't include the current post
    'post__not_in' => array($post_id),
    'meta_query' => array(
      array(
        'key' => $field['book_number'],
        'value' => $value
      )
    )
  );
  $query = new WP_Query($args);
  if (count($query->posts)){
    $valid = 'This Value is not Unique';
  }
  return $valid;
}