I found this solution to automatically assign parent terms when a child term is selected, which is working fine for the save_post hook:
add_action('save_post', 'assign_parent_terms');
function assign_parent_terms($post_id){
global $post;
if($post->post_type != 'product')
return $post_id;
// get all assigned terms
$terms = wp_get_post_terms($post_id, 'product_cat' );
foreach($terms as $term){
while($term->parent != 0 && !has_term( $term->parent, 'product_cat', $post )){
// move upward until we get to 0 level terms
wp_set_post_terms($post_id, array($term->parent), 'product_cat', true);
$term = get_term($term->parent, 'product_cat');
}
}
}
As I have a large number of posts, I need to hook into the quick edit action, not just into the save-post action.
Anybody has a solution of this hook?