/**
  * Verify that a post is ready for deploy.
  *
  * @param Post  $post
  * @param Batch $batch
  */
 public function verify_post(Post $post, Batch $batch)
 {
     /*
      * If more then one post is found when searching posts with a specific
      * GUID, then add an error message. Two or more posts should never share
      * the same GUID.
      */
     try {
         $revision = $this->post_dao->get_by_guid($post->get_guid());
     } catch (Exception $e) {
         $this->api->set_preflight_status($batch->get_id(), 2);
         $this->api->add_preflight_message($batch->get_id(), $e->getMessage(), 'error');
         return;
     }
     // Check if parent post exist on production or in batch.
     if (!$this->parent_post_exists($post, $batch->get_posts())) {
         // Fail pre-flight.
         $this->api->set_preflight_status($batch->get_id(), 2);
         // Admin URL of content stage.
         $admin_url = $batch->get_custom_data('sme_content_stage_admin_url');
         $message = sprintf('Post <a href="%s" target="_blank">%s</a> has a parent post that does not exist on production and is not part of this batch. Include post <a href="%s" target="_blank">%s</a> in this batch to resolve this issue.', $admin_url . 'post.php?post=' . $post->get_id() . '&action=edit', $post->get_title(), $admin_url . 'post.php?post=' . $post->get_parent()->get_id() . '&action=edit', $post->get_parent()->get_title());
         $this->api->add_preflight_message($batch->get_id(), $message, 'error');
         return;
     }
 }