I've got a function that auto creates taxonomy terms - Can it auto delete them as well?

Question

I've got this inside my functions.php file.

    function add_product_category_automatically($post_ID) {
global $wpdb;
if(!has_term('','product_relation',$post_ID)){
    $cat = get_the_title($post_ID);
    wp_set_object_terms($post_ID, $cat, 'product_relation');
}
}
add_action('publish_product', 'add_product_category_automatically');

It creates terms in the 'product_relation' taxonomy when a product is published. Is it possible to also have the terms automatically deleted when the product is moved to the trash?

Thanks

Answer 1

There was some confusion in the original question with the terminology i used. I didn't find a way to do what i was after but it's to late for me to do it now.

Answer 2

Instead of deleting the taxonomy, wouldn't you rather simply hide it from queries (if empty)?

Whenever you run a query with get_terms, the 'hide_empty' argument is, by default, set to true. That way, let's say you have a page where you list/display the taxonomy's products; whenever the user removes or simply does not have any products within that taxonomy, the taxonomy does not appear or echoes a 'Sorry, there are no available products.' message.

EDIT: In case you would like to have the argument visible, this is how it should look like:

<?php get_terms('product_relation', array('hide_empty'=>1)); ?>