public function storeMainData(MainDataRequest $request)
 {
     $inputs = Input::except('_token');
     foreach ($inputs as $key => $value) {
         $data = MainData::findOrCreate($key);
         $data->key = $key;
         if ($value instanceof UploadedFile) {
             $file = Input::file($key);
             $destinationPath = 'images/';
             $filename = $file->getClientOriginalName();
             $file->move($destinationPath, $filename);
             $data->value = $destinationPath . $filename;
         } else {
             $data->value = $value;
         }
         $data->save();
     }
     return redirect('panel/main-data');
 }