public function detach()
 {
     $location = Location::find(Request::input('location'));
     $color = Color::find(Request::input('color'));
     foreach (Gauge::all() as $gauge) {
         $locationColorGauge = LocationColorGauge::where('location_id', '=', $location->id)->where('color_id', '=', $color->id)->where('gauge_id', '=', $gauge->id);
         if ($locationColorGauge->first()) {
             $locationColorGauge->first()->delete();
         }
     }
     return "success";
 }