public async Task <IActionResult> AddCitiesToCountry([FromForm] AddCitiesToCountryVM country)
{
if (country.CountryId == Guid.Empty)
{
ModelState.AddModelError(string.Empty, "Unexpected error occurred: The ID was blank.");
return(BadRequest(ModelState));
}
var result = await _service.AddCitiesToCountry(country);
if (result.Message == ActionMessages.Updated)
{
var cities = country.CitiesId.Count > 1 ? "cities" : "city";
return(RedirectToAction(nameof(Details), new { id = result.Country.Id, message = $"The requested {cities} were successfully added to {result.Country.Name}." }));
}
else if (result.Message == ActionMessages.NotFound)
{
ModelState.AddModelError(string.Empty, $"Unexpected error occurred: Could not find any country with the ID: {country.CountryId}");
return(NotFound(ModelState));
}
else
{
ModelState.AddModelError(string.Empty, $"Something unexpected happened. The requested action: {result.Message.ToString()}");
return(BadRequest(ModelState));
}
}
public async Task <CountryWithMessage> AddCitiesToCountry(AddCitiesToCountryVM country)
{
try
{
if (country.CountryId == Guid.Empty)
{
throw new Exception("Unexpected error occurred: The countryId was blank.");
}
if (country.CitiesId == null || country.CitiesId.Count == 0)
{
throw new ArgumentNullException("CitiesId", "Unexpected error occurred: the list was null.");
}
var original = await _db.Countries.Include(x => x.Cities).FirstOrDefaultAsync(x => x.Id == country.CountryId);
if (original == null)
{
throw new ArgumentNullException("original", "Unexpected error occurred: country was null.");
}
foreach (var cityId in country.CitiesId)
{
var city = await _db.Cities.FirstOrDefaultAsync(x => x.Id == cityId);
if (city == null)
{
throw new Exception($"Unexpected error occurred: No city was found with the given ID: {cityId}");
}
else if (original.Cities.Contains(city))
{
throw new ArgumentException($"Unexpected error occurred: {city.Name} already exists in {original.Name}.", "original");
}
original.Cities.Add(city);
}
await _db.SaveChangesAsync();
return(new CountryWithMessage {
Country = original, Message = ActionMessages.Updated
});
}
catch (ArgumentException ex)
{
throw new DuplicateWaitObjectException(ex.ParamName, ex.Message);
}
catch (Exception ex)
{
throw new NullReferenceException(ex.Message, ex.InnerException);
}
}
