public async Task <CreateStepArtifactOptionResponse> Post(CreateStepArtifactOptionRequest request) { if (!await batchRepository.DoesBatchExist(request.BatchId)) { throw Err.BatchNotFound(request.BatchId); } var step = await stepRepository.Get(request.BatchId, request.StepName); if (step == null) { throw Err.StepNotFound(request.StepName); } var existingStepArtifact = await stepRepository.GetStepArtifact(step.Id, request.ArtifactName); if (existingStepArtifact == null) { throw Err.StepArtifactNotFound(request.ArtifactName); } if (await stepRepository.DoesStepArtifactOptionExist(request.BatchId, request.StepName, request.ArtifactName, request.OptionName)) { throw Err.StepArtifactOptionAlreadyExists(request.OptionName); } var stepArtifactOption = request.ConvertTo <StepArtifactOption>(); stepArtifactOption.StepArtifactId = existingStepArtifact.Id; await stepRepository.CreateOrUpdateStepArtifactOption(stepArtifactOption); return(new CreateStepArtifactOptionResponse()); }