Reply To: Check if value already exist

• warry

• January 5, 2016 at 1:21 am

It worked great ! Thanks a lot !
Here is my code if it can help someone else :

The name of my field is : lien_video
Name of my custom posts : videos

<?php 
add_filter('acf/validate_value/name=lien_video', 'validate_lien_video_filter', 10, 4);

function validate_lien_video_filter($valid, $value, $field, $input) {
  if (!$valid || $value == '') {
    return $valid;
  }
  // query posts for the same value
  // for more info see
  // http://codex.wordpress.org/Class_Reference/WP_Query
  global $post; 
  $args = array(
    'post_type' => 'videos',  // or your post
    'post__not_in' => array($post->ID), // do not check this post
    'meta_query' => array(
      array(
        'key' => 'lien_video',
        'value' => $value
      )
    )
  );
  $query = new WP_Query($args);
  if (count($query->posts)) {
    // found at least one post that
    // already has $value
    $valid = 'There is already a post using this video';
  }
  return $valid;
}

?>