public function __construct($parent_post_type)
{
$this->parent_post_type = $parent_post_type;
$this->parent_controller = new WP_REST_Posts_Controller($parent_post_type);
$this->namespace = 'wp/v2';
$this->rest_base = 'revisions';
$post_type_object = get_post_type_object($parent_post_type);
$this->parent_base = !empty($post_type_object->rest_base) ? $post_type_object->rest_base : $post_type_object->name;
}