public async Task <IActionResult> AddCity(Guid countryId, List <City> cities) { if (countryId == null || string.IsNullOrWhiteSpace(countryId.ToString()) || cities == null || cities.Count == 0) { return(BadRequest()); } var country = await _service.AddCities(countryId, cities); if (country == null) { return(BadRequest("Something went wrong. Please try again.")); } return(Ok(country)); }