How to properly set a value to meta fields of a custom post type?

[jadealombro]

I have a metafields that is assigned to a custom post which I added as a REST API field:

foreach( array( 'field_1', 'field_2' ) as $field ) {
    register_rest_field( $this->post_types,
     $field,
        array(
           'get_callback'    => array( $this, 'get_post_meta' ),
           'update_callback' => array( $this, 'update_post_meta' ),
           'schema'          => null,
         )
    ); 
}

And I also have the methods:

public function get_post_meta($object, $field_name, $request) {
    return get_post_meta( $object['id'], $field_name, true );
}

public function update_post_meta($value, $object, $field_name) {
    return update_post_meta( $object->ID, $field_name, $value );
}

If I test adding a new post/update and value to field_1 and field_2 through Postman, it works fine.

But when I try to add a value to the metafields, they don't seem to get added. Here is a snippet of the code I have:

response = await this.wordPress.cv_location().create({
      title: article.title,
      content: article.content,
      status: article.status,
      meta: {
        field_1: article.field_1,
        field_2: article.field_2,
      }
    });

I notice that if I use post() instead of cv_location(), the metafields get populated correcrtly with the values but the post gets added to the post post type and not the CV Location post type.

[kadamwhite]

Are you registering the meta using register_post_meta( 'your_cpt_name', [] ); on the PHP side? meta needs to be properly registered in order for the meta key to work. We need to add a better guide for this to the site, apologies for any confusion.

I know it's been a while but if you're using register_post_meta (introduced I believe in WP 4.9.8) and you're still seeing this issue, then please let us know. I'm going to leave it open as a documentation issue for now.

[kadamwhite]

Closing as a duplicate of #280 — I am be writing a meta handling guide to resolve that ticket which will give an example of this usage as well.