Woocommerce sync grouped product attributes with childrens - wordpress

Question

To achieve this, i have written 2 functions one for grouped product save and another for child product save.
1 - Adding all child attributes to the grouped product on grouped product save:
add_action('woocommerce_after_product_object_save', 'nd_update_group_product_attributes_before_save_func', 9993, 2);
function nd_update_group_product_attributes_before_save_func($product, $data_store) {
// echo 'has category <pre>';var_dump($product); echo '</pre>';die;
// exit if not the target post type
if ('product' !== $product->post_type) {
return;
}
// $product_type = $product->get_type();
$product_type = $product->post_type;
if ($product->is_type('grouped')) {
$group_product_id = $product->get_id();
nd_sync_child_attribute_to_group($group_product_id, 'pa_bedrooms');
}
}
function nd_sync_child_attribute_to_group($group_product_id, $attribute_slug){
$group_product = wc_get_product($group_product_id);
$child_product_ids = $group_product->get_children();
$all_child_attributes = array();
if($child_product_ids){
foreach ($child_product_ids as $child_product_id) {
$child_product = wc_get_product($child_product_id);
$child_attributes = wc_get_product_terms( $child_product_id, $attribute_slug, array( 'fields' => 'names' ) );
$all_child_attributes = array_unique(array_merge($all_child_attributes, $child_attributes));
}
}
if ($all_child_attributes) {
$group_attributes = wc_get_product_terms( $group_product_id, $attribute_slug, array( 'fields' => 'names' ) );
if($group_attributes){
wp_remove_object_terms( $group_product_id, $group_attributes, $attribute_slug );
}
foreach ($all_child_attributes as $attr) {
wp_set_object_terms($group_product_id, $attr, $attribute_slug, true);
}
}
}
2 - Adding all child attributes to the grouped product on child product save by triggering grouped product save.
add_action('woocommerce_update_product', 'nd_update_group_product_attributes_on_child_update', 1002, 2);
function nd_update_group_product_attributes_on_child_update($product_id) {
$product = wc_get_product( $product_id );
// exit if not the target post type
if ( !$product->is_type('simple') || !has_term( 'home-design-floor-plans', 'product_cat' , $product_id )) {
return;
}
if ( $product->is_type('simple') ) {
$children_id = $product->get_id();
$group_args = array(
'post_type' => 'product',
'meta_query' => array(
array(
'key' => '_children',
'value' => 'i:' . $product->get_id() . ';',
'compare' => 'LIKE',
)
),
'fields' => 'ids' // THIS LINE FILTERS THE SELECT SQL
);
$parent_ids = get_posts( $group_args );
if($parent_ids){
foreach ($parent_ids as $parent_grouped_id){
if($parent_grouped_id){
$parent_product = wc_get_product( $parent_grouped_id );
if($parent_product){
$parent_product->save();
}
}
}
}
}
}
I have an issue with this once I add an attribute value to a grouped product, it was not showing on the admin area group product edit > attributes.
Is there anything I missed or is there any better way to achieve this?
All I want is to sync child product attributes to parent i.e. group product.