Here is what I needed to do:
add_filter( ‘bbp_register_topic_post_type’, ‘enable_restAPI_bbpress_topics’, 10,1);
function enable_restAPI_bbpress_topics ($args) {
$args[‘show_in_rest’] = true;
$args[‘supports’] = array( ‘title’, ‘editor’, ‘author’ );
return $args;
}
Notice the supports variable. By including author that ensures post_author is set.
Seriously, BBPress should simply include a setting in backend to enable restAPI. That is the direction that the web is heading in already, with headless CMS, decoupling front and and backend.
