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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;
}
?>
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