I was able to do it in a static way using some code from another thread here
My current code looks like this
function load_proper_choices_number ( $field ) {
global $post;
if (!$post ||
!isset($post->ID) ||
( get_post_type($post->ID) != 'featured-content' ) ) {
return $field;
}
$number_value = get_post_meta($post->ID, 'featured_posts_number');
$field['max'] = $number_value;
return $field;
}
add_action( 'acf/load_field/name=featured_posts', 'load_proper_choices_number');
Works properly with a refresh every time I change the number of posts using the Number field, and now I will try to achieve it using some javascript. I do assume updating the data-max attributes of the relationship field should do the job.
Will let you know.
