/**
  * Update the status of some paperwork.
  * @param \App\Http\Requests\GenericRequest $request
  * @param \App\Event                        $event
  * @return mixed
  */
 private function update_Paperwork(GenericRequest $request, Event $event)
 {
     // Check the event type is event
     if (!$event->isEvent()) {
         return $this->ajaxError('Paperwork is only applicable to events');
     }
     // Check the paperwork type is valid
     $type = $request->get('field');
     if (!isset(Event::$Paperwork[$type])) {
         return $this->ajaxError('Unknown paperwork type: ' . $type);
     }
     // Save
     $event->update(['paperwork' => array_merge($event->paperwork, [$type => $request->get('value') === 'true'])]);
     return Response::json(true);
 }