Cross update taxonomies

Did you find an answer to this? I have a similar need.

Bump. I need the same thing as well.

Ok I’m working on a solution. This is what I have so far…This is a multiple way association where when you create/edit a post of a certain CPT-onomy (CPT #1) with associations to particular terms of your other CPT-onomies (CPT #2-infinity), it will update each of the associated terms with a connection back to the post.

For example:

CURRENT POST (CPT #1)
      tagged with
         CPT #2 TERM #1
         CPT #3 TERM #2
         CPT #4 TERM #3

Will update:

CPT #2 TERM #1
      tagged with
         CURRENT POST
CPT #3 TERM #2
      tagged with
         CURRENT POST
CPT #4 TERM #3
      tagged with
         CURRENT POST

WHAT IT WILL NOT DO:

1.) If CPT #3 is associated with CPT #2 and your current post is tagged with CPT #3, it will NOT recursively update the current post to be associated with all CPT #2 terms that are associated with the CPT #3 terms selected.

2.) If CPT #2 is hierarchical and TERM #3 belongs to TERM #2 which belongs to TERM #1, tagging the current post with TERM #3 will not connect it to TERM #2 and TERM #1

SOMEONE PLEASE FEEL FREE TO ADD THOSE CAPABILITIES, I’ll work on it more when I can.

function cross_update_CPTonomies($post_id) {
    // GET REAL POST ID IF THIS IS A REVISION
    if($parent_id = wp_is_post_revision($post_id)){
        $post_id = $parent_id;
    }

    $post_type = get_post_type($post_id);
    global $cpt_onomy;

    // WHAT CPT-ONOMIES ARE CONNECTED?
    $CPTonomies = array({CPT #1 NAME}, {CPT #2 NAME}, {CPT #3 NAME});

    // CHECK IF CURRENT POST IS ONE OF THE CONNECTED CPT-ONOMIES
    if(in_array($post_type, $CPTonomies)){

        // REMOVE THE CURRENT POST TYPE FROM CPT-ONOMIES ARRAY (MEANS YOU CONNECT THE POST TO THE REMAINING CPT-ONOMIES AND NOT TO CURRENT POST TYPE)
        // THIS IS OPTIONAL IF YOUR CPT-ONOMIES CONNECT TO THEMSELF
        if(($key = array_search($post_type, $CPTonomies)) !== false) {
            unset($CPTonomies[$key]);
        }

        // LOOP THROUGH EACH REMAINING CPT-ONOMY AND CONNECT IT TO CURRENT POST
        foreach($CPTonomies AS $CPTonomie){
            $terms = get_the_terms($post_id, $CPTonomie);

            // CHECK IF POST HAS BEEN ASSOCIATED WITH ANY TERMS OF THIS CPT-ONOMY
            if($terms && !is_wp_error($terms)){

                // FOR EACH TERM THAT WAS ASSOCIATED, LINK FROM THAT TERM BACK TO CURRENT POST
                foreach($terms as $term){
                    $cpt_onomy->wp_set_object_terms($term->term_id, $post_id, $post_type, true);
                } // END FOR EACH TERM
            } // END IF POST HAS BEEN ASSOCIATED WITH TERMS OF THIS CPT-ONOMY AND THERE ARE NO ERRORS
        } // END FOR EACH REMAINING CPT-ONOMY
    } // END IF POST TYPE IS ONE OF THE CONNECT CPT-ONOMIES

} // END CROSS UPDATE CPT-ONOMIES

add_action('save_post', 'cross_update_CPTonomies');