/// <summary>
/// Updates a location using a <see cref="Delta"/> object.
/// </summary>
/// <param name="id">ID of the location to be updated.</param>
/// <param name="delta">
/// Delta containing a list of location properties. Web Api does the magic of converting the JSON to
/// a delta.
/// </param>
/// <returns>
/// An asynchronous task result containing information needed to create an API response message.
/// </returns>
public override async Task <CommandResult <LocationBaseDto, Guid> > Update(Guid id, Delta <LocationBaseDto> delta)
{
// Thread.CurrentPrincipal is not available in the constrtor. Do not try and move this
var uid = GetCurrentUser();
// User ID should always be available, but if not ...
if (!uid.HasValue)
{
return(Command.Error <LocationBaseDto>(GeneralErrorCodes.TokenInvalid("UserId")));
}
if (delta == null)
{
return(Command.Error <LocationBaseDto>(EntityErrorCode.EntityFormatIsInvalid));
}
var location = await _context.GetLocationsForUser(uid.Value)
.SingleOrDefaultAsync(l => l.Id == id)
.ConfigureAwait(false);
if (location == null)
{
return(Command.Error <LocationBaseDto>(EntityErrorCode.EntityNotFound));
}
var locationDto = _mapper.Map(location, new LocationBaseDto());
delta.Patch(locationDto);
var validationResponse = ValidatorUpdate.Validate(locationDto);
if (locationDto.ParentId.HasValue)
{
var existingTask = _context.Locations.AnyAsync(l => l.Id == locationDto.ParentId.Value);
if (!existingTask.Result)
{
validationResponse.FFErrors.Add(ValidationErrorCode.ForeignKeyValueDoesNotExist(nameof(Location.ParentId)));
}
else
{
// Check for circular references
if (await LocationValidator.IsCircularReference(_context.Locations, locationDto, id))
{
validationResponse.FFErrors.Add(ValidationErrorCode.CircularReferenceNotAllowed(nameof(Location.ParentId)));
}
}
}
// Check that Location Type exists
if (locationDto.LocationTypeId != Guid.Empty && !_context.LocationTypes.Any(lt => lt.Id == locationDto.LocationTypeId))
{
validationResponse.FFErrors.Add(ValidationErrorCode.ForeignKeyValueDoesNotExist(nameof(Location.LocationTypeId)));
}
// Including the original Id in the Patch request will not return an error but attempting to change the Id is not allowed.
if (locationDto.Id != id)
{
validationResponse.FFErrors.Add(ValidationErrorCode.EntityIDUpdateNotAllowed("Id"));
}
// Check that unique fields are still unique
if (_context.Locations.Any(l => l.Id != id && l.Name == locationDto.Name))
{
validationResponse.FFErrors.Add(ValidationErrorCode.EntityPropertyDuplicateNotAllowed(nameof(Location.Name)));
}
if (validationResponse.IsInvalid)
{
return(Command.Error <LocationBaseDto>(validationResponse));
}
_context.Locations.Attach(location);
_mapper.Map(locationDto, location);
location.SetAuditFieldsOnUpdate(uid.Value);
await _context.SaveChangesAsync().ConfigureAwait(false);
return(Command.NoContent <LocationBaseDto>());
}