• Nigel Rodgers

• in reply to: strange "Error Field type does not exist"
• November 7, 2016 at 3:17 pm

Thanks! Sucks being new to coding, But you guys make it worth it!

• Nigel Rodgers

• in reply to: Accept only unique values
• November 6, 2016 at 10:41 pm

Thanks! You’re awesome!

• Nigel Rodgers

• in reply to: strange "Error Field type does not exist"
• November 4, 2016 at 6:33 pm

Hi James I came I use the following filter I get the same issue:

add_filter('acf/load_field/name=hidden_post_id', 'make_hidden_post_id_readonly', 10, 1);
function make_field_readonly($field) {
  // sets readonly attribute for field
  $field['readonly'] = 1;
  return $field;
}

the hidden_post_id disappears from the field group in the acf menu.

I actually copied that filter script from John Huebner:
https://support.advancedcustomfields.com/forums/topic/accept-only-unique-values/#post-45352

• Nigel Rodgers

• in reply to: Accept only unique values
• November 4, 2016 at 5:47 pm

Thanks John! I have no idea what I’m doing but your code got me close. I’m making a lyrics site / hymn book and want to prevent duplicate hymns, but I’m stuck. Can you get my code to validate?

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 $post_id;
}
add_action('admin_head', 'hide_hidden_post_id');
function hide_hidden_post_id() {
  ?>
    <style type="text/css">
      /* the field key for the post id field */
      div[data-field_key="field_581bff482f898"] {
        display: none;
      }
    </style>
  <?php
}
add_filter('acf/validate_value/type=number', 'require_unique', 10, 4);
function require_unique($valid, $value, $field, $input) {
  if (!$valid) {
    return $valid;
  }
  // get the post id
  // using field key of post id field
  $post_id = $_POST['acf']['field_581bff482f898'];
  // query existing posts for matching value
  $args = array(
    'post_type' => 'hymn',
    'posts_per_page' => 1, // only need to see if there is 1
    'post_status' => 'publish, draft, trash',
    // don't include the current post
    'post__not_in' => array($post_id),
    'meta_query' => array(
      array(
        'key' => $field['type'],
        'value' => $value
      )
    )
  );
  $query = new WP_Query($args);
  if (count($query->posts)){
    $valid = 'This Value is not Unique';
  }
  return $valid;
}

I added the hidden_post_id to the field group in the ACF menu.The hidden_post_id is working, although the acf/load_field wasn’t working for some reason.

acf/load_field gives me issues similar to these:
https://support.advancedcustomfields.com/forums/topic/acf-disappearing/
https://support.advancedcustomfields.com/forums/topic/strange-error-field-type-does-not-exist/

Lastly, while WP_Query looks like a better solution. Is there an easier way to do it with $wpdb?