public IActionResult GetDetail(int id) { Customer _customer = _customerRepository.GetSingle(id); if (_customer == null) { return(NotFound()); } IEnumerable <CallViewModel> _callsViewModel = _mapper.Map <IEnumerable <CallViewModel> >(_callRepository.FindBy(c => c.CustomerId == id)); //IEnumerable<Call> _calls = _callRepository.GetAll(); //IEnumerable<CallViewModel> _callsviewModel = _mapper.Map<IEnumerable<CallViewModel>>(_calls); return(new OkObjectResult(_callsViewModel)); }