/**
  * Update the specified model device in storage.
  *
  * @param  int  $id
  * @return string
  */
 public function update($id)
 {
     $modeldevices = ModelDevice::find($id);
     $vld = ModelDevice::validate(\Input::all(), $modeldevices->id);
     if ($vld->passes()) {
         $modeldevices->update(\Input::all());
         return json_encode($modeldevices);
     }
     return json_encode(array("Error" => $vld->messages()));
 }