/**
  * @param Request $request
  * @param $id
  * @return \Illuminate\Http\JsonResponse
  */
 public function update(Request $request, $id)
 {
     $artists = Artist::find($id);
     if (!$artists) {
         return response()->json(['status' => 'error', 'message' => 'artista no encontrado']);
     }
     try {
         $this->validate($request, Artist::$rules);
         $input = $request->all();
         $artists->name = $input['name'];
         $roles = Roles::whereIn('id', $input['rol'])->get();
         $artists->save();
         $artists->roles()->saveMany($roles);
         return response()->json(['status' => 'success']);
     } catch (ValidationException $e) {
         return response()->json(['status' => 'validation_error', 'messages' => $e->validator->errors()]);
     } catch (\Exception $e) {
         return response()->json(['status' => 'server_error', 'message' => $e->getMessage()]);
     }
 }
 /**
  * detail of role
  * @param $id
  * @return \Illuminate\Http\JsonResponse
  */
 public function detail($id)
 {
     $roles = Roles::with('Artist')->find($id);
     return response()->json($roles);
 }