ACF Custom location rule to select grandparent page - php

Question

I am trying to build a custom location rule to be able to select a grand-parent page, yet without success... Here is my goal :
Show this field group if :
Page Grand-Parent -------- is equal to --------- page x
Anyone ?
Thank you !
Johan
ACF Documentation is a bit poor on the subject...

Answer 1

Here is the answer...
Simply copy theses lines to your functions.php...
Thanx to John Huebner who kindly helped on the ACF Forum...
add_filter('acf/location/rule_types', 'acf_location_rules_page_grandparent');
function acf_location_rules_page_grandparent($choices) {
$choices['Page']['page_grandparent'] = 'Page Grandparent';
return $choices;
}
add_filter('acf/location/rule_values/page_grandparent','acf_location_rules_values_page_grandparent');
function acf_location_rules_values_page_grandparent($choices) {
// this code is copied directly from
// render_location_values()
// case "page"
$groups = acf_get_grouped_posts(array(
'post_type' => 'page'
));
if (!empty($groups)) {
foreach(array_keys($groups) as $group_title) {
$posts = acf_extract_var($groups, $group_title);
foreach(array_keys($posts) as $post_id) {
$posts[$post_id] = acf_get_post_title($posts[$post_id]);
};
$choices = $posts;
}
}
// end of copy from ACF
return $choices;
}
add_filter('acf/location/rule_match/page_grandparent', 'acf_location_rules_match_page_grandparent', 10, 3);
function acf_location_rules_match_page_grandparent($match, $rule, $options) {
// this code is with inspiration from
// acf_location::rule_match_page_parent()
// with addition of adding grandparent check
if(!$options['post_id']) {
return false;
}
$post_grandparent = 0;
$post = get_post($options['post_id']);
if ($post->post_parent) {
$parent = get_post($post->post_parent);
if ($parent->post_parent) {
$post_grandparent = $parent->post_parent;
}
}
if (isset($options['page_parent']) && $options['page_parent']) {
$parent = get_post($options['page_parent']);
if ($parent->post_parent) {
$post_grandparent = $parent->post_parent;
}
}
if (!$post_grandparent) {
return false;
}
if ($rule['operator'] == "==") {
$match = ($post_grandparent == $rule['value']);
} elseif ($rule['operator'] == "!=") {
$match = ($post_grandparent != $rule['value']);
}
return $match;
}