public HttpResponseMessage Atualizar(HttpRequestMessage request, StatusSistemaViewModel StatusSistemaVM)
        {
            return(CreateHttpResponse(request, () =>
            {
                HttpResponseMessage response = null;

                if (!ModelState.IsValid)
                {
                    response = request.CreateResponse(HttpStatusCode.BadRequest,
                                                      ModelState.Keys.SelectMany(k => ModelState[k].Errors)
                                                      .Select(m => m.ErrorMessage).ToArray());
                }
                else
                {
                    StatusSistema novoStatus = _statusSistema.GetSingle(StatusSistemaVM.Id);

                    Usuario usuario = _usuarioRep.GetSingle(int.Parse(HttpContext.Current.User.Identity.GetUserId()));
                    novoStatus.AtualizarStatusSistema(StatusSistemaVM, usuario);

                    _unitOfWork.Commit();

                    // Update view model
                    StatusSistemaVM = Mapper.Map <StatusSistema, StatusSistemaViewModel>(novoStatus);
                    response = request.CreateResponse(HttpStatusCode.OK, StatusSistemaVM);
                }

                return response;
            }));
        }