[Résolu] Add Parent Post Title to Child Post Title Using cred_save_data Function

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[julieP]

I have post types AAA and BBB. Post type BBB is a child of AAA. I want the post title of BBB to to be the same as AAA .

I use this function (elsewhere) to update a post title from a custom field in the same post

function save_data_form_100($post_id, $form_data){
            
            if ($form_data['id']==100){
                
               $custom_title = get_post_meta( $post_id, 'wpcf-custom-field', true );
                
                    $my_post = array(
                    'ID' => $post_id,
                    'post_title' => $custom_title,
                    'post_name' => $custom_title,
                    
                );
                
                wp_update_post( $my_post );
                
            }
        }
    add_action('cred_save_data', 'save_data_form_100',10,2);

How do I adjust this to either :-

1. update the post title of BBB with the post title of AAA

OR

2. update the post title of BBB with the value of a custom field in AAA

please?

I've trawled loads of other forum threads in search of the answer but nothing I've tried has worked.

Many thanks

[Christian Cox]

Types defines the link between a child post and a parent post using a postmeta field '_wpcf_belongs_aaa_id' applied to the child post. So you can access any information about the parent post by getting the value of that postmeta field, and using that as an ID to query the parent post.

...
// get the parent ID from the child postmeta
$parent_id = get_post_meta($post_id, '_wpcf_belongs_aaa_id', true);
// get the title from the parent postmeta
$custom_title = get_post_meta( $parent_id, 'wpcf-custom-field', true );
...

Replace 'aaa' with the slug of your parent post type, and 'custom-field' with the slug of the parent post custom field.

[julieP]

Hi Christian

Many thanks for this - I was almost there and can see where my code needed adjusting.

Since posting, I've realised that actually using parent/child posts might not be the best approach in this instance. Before I close this thread, can I ask you about this scenario please?:-

Let's suppose there is no relationship between Post Type AAA and BBB. A post has been created using Type AAA and has an ID of 100 . A post using Type BBB is to have a post title using the value of wpcf-custom-field from the post with ID of 100. Is this achievable and how would I adjust my code for this please?

[Christian Cox]

Instead of using a parent ID variable, you would hard-code the number 100 in its place:

...
// get the title from post 100's postmeta
$custom_title = get_post_meta( 100, 'wpcf-custom-field', true );
...

Now every post created by the CRED form will be assigned a custom title using the custom field from post ID 100.

WP documentation for get_post_meta: https://developer.wordpress.org/reference/functions/get_post_meta/

[julieP]

That's awesome Christian, thank you!