/**
  * Called when a Resource is deleted. It deletes all the reservations of the the deleted Resource.
  *
  * @since    0.1.0
  */
 public function delete_resource_reservations($post_id)
 {
     $post = get_post($post_id);
     if ('resource' === $post->post_type) {
         $rb_db = new Resource_Booking_DB();
         $rb_db->delete_resource($post_id);
         // postmeta rows are deleted automatically by wp
     }
 }