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?
