public async Task <Result> HandleAsync(DeleteExamCommand command)
{
var exam = await _examsRepository.GetByIdAsync(_examId);
if (exam == null)
{
throw new NullReferenceException($"Exam with ID '{_examId}' was not found.");
}
await _examsRepository.RemoveAsync(exam);
return(Result.Success());
}
public async Task <Result <ExamWithQuestionsResult> > HandleAsync(GetExamByIdQuery query)
{
var exam = await _examsRepository.GetByIdAsync(query.Id);
if (exam == null)
{
return(Result.Failure(query, "Exam with given Id does not exists."));
}
var result = _mapper.Map <ExamWithQuestionsResult>(exam);
result.Questions = result.Questions.OrderBy(x => x.Order).ToList();
return(Result.Success(result));
}
public async Task <Result> HandleAsync(EditExamCommand command)
{
var exam = await _examsRepository.GetByIdAsync(_examId);
if (exam == null)
{
return(Result.Failure($"Exam with ID '{_examId}' was not found."));
}
exam.SetName(command.Name);
exam.ChangeType(command.Type);
exam.SetCategory(command.Category);
var commandQuestionIds = command.Questions
.Where(x => x.Id.HasValue)
.Select(p => p.Id.Value)
.ToList();
exam.Questions
.Select(x => x.Id)
.Except(commandQuestionIds)
.ToList()
.ForEach(id => exam.RemoveQuestion(id));
foreach (var q in command.Questions)
{
if (q.Id.HasValue)
{
var existedQuestion = exam.Questions.SingleOrDefault(x => x.Id == q.Id);
if (existedQuestion != null)
{
existedQuestion.SetOrder(q.Order);
existedQuestion.SetText(q.Text);
existedQuestion.SetAnswers(q.A, q.B, q.C, q.D);
existedQuestion.SetExplantation(q.Explanation);
existedQuestion.ChangeCorrectAnswer(q.CorrectAnswer);
continue;
}
}
exam.AddQuestion(q.Order, q.Text, q.A, q.B, q.C, q.D, q.CorrectAnswer, q.Explanation);
}
await _examsRepository.UpdateAsync(exam);
return(Result.Success());
}
public async Task <Exam> GetExamByIdAsync(Guid id)
{
return(await _examsRepository.GetByIdAsync(id));
}