Creating a custom field with value from other custom fields

Hello

I was basicly succesfull with your help. One thing is not working though:

When using this code on frontend of the post, it is working fine and showing the first name of the artist (fetched from custom taxonomy field):

<?php
$terms = get_the_terms( get_queried_object_id(), 'artists' );

foreach ( $terms as $term ) {
$term_name = rwmb_meta( 'fg_meta_artist_name', ['object_type' => 'term'], $term->term_id );
$term_name_first = rwmb_meta( 'fg_meta_artist_name_first', ['object_type' => 'term'], $term->term_id );

$value $term_name_first;
echo $value;
}

?>

When trying to fill an empty custom field (text) with the same value, the field it not filled up:

<?php
add_action( 'rwmb_after_save_post', function( $post_id ) {

< code from above (without echo) >

update_post_meta( $post_id, 'fg_taxo_object_artist_names', $value );
} );

?>

Both fields are text fields.
Do you see any reason why this is not working?

Thanks a lot in advance.
Regards, François

Hello

Yes the 1st code is implemented on the single post template (cpt) (php code block in oxygen builder).

The 2nd Code is in a code snippet and should update the field 'fg_taxo_object_artist_names' after saving a post in the editor (no frontend submission).

But the field is not updatet. I guess the field values of the taxonomies are not fetched?
(why is it working on frontend but not on backend?)

Hope I was able to explain more clear.

Hi,

Thanks for your hint. Unfortunately this to high for me. I can't see where to change to code to get the term id on backend.

This is my code. I don't know if you can provide the correct snippet.
If not, thanks anyway. I understand.

<?php
add_action( 'rwmb_after_save_post', function( $post_id ) {

$terms = get_the_terms( get_queried_object_id(), 'artists' );
foreach ( $terms as $term ) {
    $term_name = rwmb_meta( 'fg_meta_artist_name', ['object_type' => 'term'], $term->term_id );
    $term_name_first = rwmb_meta( 'fg_meta_artist_name_first', ['object_type' => 'term'], $term->term_id );

    $value = $term_name_first;
}
        update_post_meta( $post_id, 'fg_taxo_object_artist_names', $value );
} );
?>

Hi and thank you.

Unfortunately the code is not working. I see I need to leverage my php knowledge urgently to get things like this work.

Hava a nice day.