/**
  * Get last answer or comment.
  * 
  * @param bool $onlyVisible default true
  * @return CMA_Answer|CMA_Comment
  */
 public function getLastComment($onlyVisible = true)
 {
     global $wpdb;
     //         if( empty($format) )
     //         {
     //             $format = get_option('date_format') . ' ' . get_option('time_format');
     //         }
     $records = $wpdb->get_results($wpdb->prepare("SELECT * FROM {$wpdb->comments}\n        \tWHERE comment_post_ID = %d AND comment_approved = 1\n        \tORDER BY comment_ID DESC", $this->getId()));
     foreach ($records as $record) {
         if ($record->comment_type == CMA_Answer::COMMENT_TYPE) {
             if ($answer = new CMA_Answer($record)) {
                 if (!$onlyVisible or $answer->isVisible()) {
                     return $answer;
                 }
             }
         } else {
             if ($comment = new CMA_Comment($record)) {
                 if (!$onlyVisible or $comment->isVisible()) {
                     return $comment;
                 }
             }
         }
     }
     //         $lastAnswer = $this->getLastAnswer();
     //         if( $lastAnswer )
     //         {
     //             $dateString = $lastAnswer->getDate();
     //         }
     //         else
     //         {
     //             $dateString = $this->post->post_modified;
     //         }
     //         return date_i18n($format, strtotime($dateString));
 }