public static function update_from_event(\core\event\base $event)
 {
     global $CFG;
     require_once $CFG->dirroot . '/mod/checklist/autoupdate.php';
     if ($event->target == 'course_module_completion' && $event->action == 'updated') {
         // Update from a completion change event.
         $comp = $event->get_record_snapshot('course_modules_completion', $event->objectid);
         // Update any relevant checklists.
         checklist_completion_autoupdate($comp->coursemoduleid, $comp->userid, $comp->completionstate);
     } else {
         // Check if this is an action that counts as 'completing' an activity (when completion is off).
         $info = self::get_entry_info($event);
         if (!$info) {
             return;
         }
         // Update any relevant checklists.
         checklist_autoupdate_internal($info->course, $info->module, $info->cmid, $info->userid);
     }
 }