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  • Thanks, I found the keys. Now the only issue is that it says there are 4 errors when only two of the 4 entries are duplicates. It puts a red flag on each of the 4 fields.

    Example:
    gallery_id: network
    gallery_id: network
    gallery_id: automation
    gallery_id: security

     add_filter('acf/validate_value/key=field_58d453ce55ea1', 'acf_unique_repeater_sub_field', 10, 4);
function acf_unique_repeater_sub_field($valid, $value, $field, $input) {
  // set up an array to hold all submitted values for rows
  $list = array();
  foreach ($_POST['acf']['field_58bbc19f95a04'] as $row) {
    if (in_array($row['field_58d453ce55ea1'], $list)) {
      // this one already exists
      $valid = 'There are duplicate '.$field['name'].' values';
      // found a duplicate so we don't need to continue looping
      break;
    }
    // add the value of this row to the list
    $list[] = $row['field_58d453ce55ea1'];
  }
  return $valid;
}

  • How do I find the keys?

  • Sorry, I’m trying to have a unique value for the sub-field in one post. I am creating a gallery page. Each page has several groups of images (gallery groups). I would like to have a unique ID (<div id=”home-entertainment”>) that I can use as an anchor to link to.

    For example: 

    <div class="gallery-group" id="home-entertainment">
<h2>Home Entertainment</h2>
<img src="image1.jpg" />
<img src="image2.jpg" />
</div>

<div class="gallery-group" id="home-security">
<h2>Home Security</h2>
<img src="image3.jpg" />
<img src="image4.jpg" />
</div>

<div class="gallery-group" id="home-automation">
<h2>Home Automation</h2>
<img src="image5.jpg" />
<img src="image6.jpg" />
</div>

  • It might help to know that this is inside of a repeater field used on the same wordpress page.

    The repeater field is called gallery_group.
    The inner field is called gallery_group_id.

  • It doesn’t seem to be working. I created a field called gallery_group_id. Here is the code I added to functions.php. When I enter two values of the same I am not given any error and it accepts them. 

     
  add_filter('acf/validate_value/name='.$field_name, 'acf_unique_value_field', 10, 4);
  
  function acf_unique_value_field($valid, $value, $field, $input) {
    if (!$valid || (!isset($_POST['post_ID']) && !isset($_POST['post_id']))) {
      return $valid;
    }
    if (isset($_POST['post_ID'])) {
      $post_id = intval($_POST['post_ID']);
    } else {
      $post_id = intval($_POST['post_id']);
    }
    if (!$post_id) {
      return $valid;
    }
    $post_type = get_post_type($post_id);
    $field_name = $field['name'];
    $args = array(
      'post_type' => $post_type,
      'post_status' => 'publish, draft, trash',
      'post__not_in' => array($post_id),
      'meta_query' => array(
        array(
          'key' => $field_name,
          'value' => $value
        )
      )
    );
    $query = new WP_Query($args);
    if (count($query->posts)){
      return 'This Value is not Unique. Please enter a unique '.$field['label'];
    }
    return true;
  }
    
add_filter('acf/validate_value/name=gallery_group_id', 'acf_unique_value_field', 10, 4);

  • I am wanting to prevent a user from entering a value that has already been entered. I am looking at John’s final code above. Does this go in the functions.php file or somewhere else? Will it create a new field type called unique value or will I have to edit the code whenever I create a new field that I want to restrict unique values?

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