hi
i want to create a custom post type that have a field (acf) with unique value
for example student number (name: sn)
please help me
regards
If you are looking to have a field that only allows unique values across all posts see this comment https://support.advancedcustomfields.com/forums/topic/accept-only-unique-values/#post-45359
hi
i have a custom post type “professor” and a relationship field ( refer to “person” custom post type ) with name of “persona” but this code did not work
add_filter('acf/validate_value/name=persona', '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
// query existing posts for matching value
$args = array(
'post_type' => 'professor',
'posts_per_page' => 1, // only need to see if there is 1
'meta_query' => array(
array(
'key' => 'persona',
'value' => $value
)
)
);
$query = new WP_Query($args);
if (count($query->posts)){
$valid = 'This Value is not Unique';
}
return $valid;
}
Relationship fields to not work like standard field. Relationship field store a serialized array of values. You are basically trying to create a 1 to 1 relationship but the relationship field is a 1 to many relationship.
First I would suggest switching to a post object field, which by default is a 1:1 relationship.
If you can’t do that then I’d suggest reading this https://www.advancedcustomfields.com/resources/querying-relationship-fields/
i used post object field but even this simple code that i put in function.php is not working
and posts are published
add_filter('acf/validate_value/name=persona', 'require_unique', 10, 4);
function require_unique($valid, $value, $field, $input) {
if (!$valid) {
return $valid;
}
$valid = 'This Value is not Unique';
return $valid;
}
Is the field “persona” a sub field of some kind?
