public async Task <IActionResult> AddQuiz([FromBody] AddQuizRequest request)
{
if (!TryValidateModel(request, nameof(request)))
{
return(BadRequest("Invalid form data"));
}
var questions = request.Elements.Select(it => it.Question).ToHashSet();
if (questions.Count() != request.Elements.Count())
{
return(BadRequest("All questions must be different"));
}
foreach (var addQuizRequestElement in request.Elements)
{
if (addQuizRequestElement.Answers.Contains(addQuizRequestElement.CorrectAnswer) == false)
{
return(BadRequest("Correct answer is not found in the available answers"));
}
}
var model = new Quiz()
{
Id = Guid.NewGuid(),
Elements = request.Elements.Select(it => new QuizElement(Guid.NewGuid(), it.Question, it.Answers, it.CorrectAnswer))
};
await _repo.AddQuiz(model, request.LessonId);
return(Ok());
}
public async Task AddQuiz(Quiz quiz, Guid lessonId)
{
var lesson = await _context.Lessons.FirstOrDefaultAsync(it => it.Id == lessonId);
if (lesson.QuizId != null)
{
throw new InvalidOperationException("Lesson already has a quiz");
}
var q = new Models.Quiz()
{
Id = quiz.Id,
Name = "Quiz"
};
lesson.QuizId = quiz.Id;
await _context.Quizzes.AddAsync(q);
// lesson.Quiz.Elements = quiz.Elements.Select(it => new QuizElement(it.Id, it.Question, it.Answers.ToList(), it.CorrectAnswer)).ToList();
quiz.Elements.Select(it => new QuizElement(it.Id, quiz.Id, it.Question, it.Answers.ToList(), it.CorrectAnswer)).ToList().ForEach(
it =>
{
_context.QuizElements.Add(it);
});
await _context.SaveChangesAsync();
}