public function show(Datatables $datatables, $id)
 {
     $store = Store::findOrFail($id);
     $device = Device::findOrFail($id);
     if ($datatables->getRequest()->ajax()) {
         return $datatables->of(Visitor::select(['type', 'device_id', 'created_at'])->where('device_id', $device->id)->orderBy('created_at', 'desc'))->make(true);
     }
     $html = $datatables->getHtmlBuilder()->columns(['type', 'created_at']);
     return view('backend.admin.stores.show', compact('device', 'store', 'html'));
 }