hook to update taxonomy, depending on a field value

• nAtic

• September 22, 2014 at 11:01 pm

Hey guys,

i have 2 custom fields for rental and buy prices on every post in my custom taxonomy “products”.

when i add either a rental price, or a price to buy (or both) and update my post, i need wordpress to add a term (buy-rental) to the post, or remove it if no price has been set.

no big deal, with a hook to ‘save_post’, right? check if any value has been set and update terms accordingly:

function imm_data_conform($post_id) {
    if (get_field('buy')) {
        wp_set_post_terms($post_id, '15', 'products', TRUE);
    }

    if (get_field('rental')) {
        wp_set_post_terms($post_id, '15', 'products', TRUE);
    }

    if ((get_field('buy') == '') and ( get_field('rental') == '')) {
        imm_remove_post_term($post_id, '15', 'products');
    }
}

add_action('save_post', 'imm_data_conform');

the strange thing is, that it does not work on the first update.
i have to press “update” once, wait for the page to reload and press “update” again. only then will the taxonomy change.

i use the same code over ajax on the frontend (without the hook) and it works on the first try.

i don’t get it… please point me into the right direction 😉