/**
  * view other identifier add or edit page
  * @param $id
  * @return \Illuminate\View\View
  */
 public function index($id)
 {
     $activityData = $this->activityManager->getActivityData($id);
     if (Gate::denies('ownership', $activityData)) {
         return redirect()->back()->withResponse($this->getNoPrivilegesMessage());
     }
     $otherIdentifier = $this->otherIdentifierManager->getOtherIdentifierData($id);
     $form = $this->otherIdentifierForm->editForm($otherIdentifier, $id);
     return view('Activity.otherIdentifier.otherIdentifier', compact('form', 'otherIdentifier', 'id', 'activityData'));
 }