Meta Box

Participant

For anyone following, I have found a fix for the post_tag not having it's meta values saved as well.

In order to fix this one must edit mb-rest-api/class-mb-rest-api.php and change

    `register_rest_field(
        $this-&gt;get_types('taxonomy'),
        'meta_box',
        array(
            'get_callback'    =&gt; array( $this, 'get_term_meta' ),
            'update_callback' =&gt; array( $this, 'update_term_meta' ),
        )
    );`

     $taxonomies = $this->get_types('taxonomy');
        if (in_array("post_tag", $taxonomies)) {
            $post_tag_key = array_search('post_tag', $taxonomies);
            $taxonomies[$post_tag_key] = 'tag';
        }

        register_rest_field(
            $taxonomies,
            'meta_box',
            array(
                'get_callback'    => array( $this, 'get_term_meta' ),
                'update_callback' => array( $this, 'update_term_meta' ),
            )
        );

This is because there appears to be a bug in WordPress rest api itself where it checks for 'tag' instead of 'post_tag' when looking for additional fields.

Reply To: POST meta fields to tags