public async Task <IActionResult> UpdateQuestion(int quizId, int questionId, [FromBody] QuestionArgs data)
{
if (!ModelState.IsValid)
{
return(new BadRequestObjectResult(ModelState));
}
Quiz quiz = await _Db.Quizzes.FindAsync(quizId);
QuizQuestion question = await _Db.QuizQuestions.Include(q => q.Answers).Where(q => q.Id == questionId).FirstOrDefaultAsync();
if (quiz == null || question == null)
{
return(NotFound(new ResponseHelper("Something went wrong. Please refresh your browser and try again.", "Unable to find question in database")));
}
using (var transaction = await _Db.Database.BeginTransactionAsync())
{
question.CorrectAnswerId = null;
await _Db.SaveChangesAsync();
_Db.RemoveRange(question.Answers);
await _Db.SaveChangesAsync();
question.ImageId = data.Image?.Id;
question.Text = data.Text;
question.TrueFalseAnswer = data.TrueFalseAnswer;
question.AudioId = data.Audio?.Id;
if (data.Answers != null)
{
foreach (AnswerArgs answerArgs in data.Answers)
{
QuizAnswer newAns = new QuizAnswer
{
QuizQuestionId = question.Id,
Text = answerArgs.Text,
ImageId = answerArgs.Image?.Id
};
await _Db.AddAsync(newAns);
await _Db.SaveChangesAsync();
if (data.Answers.IndexOf(answerArgs) == data.CorrectAnswerIndex)
{
question.CorrectAnswerId = newAns.Id;
}
}
}
quiz.UpdatedAt = DateTime.UtcNow;
await _Db.SaveChangesAsync();
transaction.Commit();
}
return(Ok());
}
public async Task <IActionResult> AddQuestion(int quizId, [FromBody] QuestionArgs data)
{
if (!ModelState.IsValid)
{
return(new BadRequestObjectResult(ModelState));
}
Quiz quiz = await _Db.Quizzes.Include(q => q.Questions).Where(q => q.Id == quizId).FirstOrDefaultAsync();
if (quiz == null)
{
return(NotFound(new ResponseHelper("Something went wrong. Please refresh your browser and try again.", "Unable to find quiz in database")));
}
QuizQuestion question = new QuizQuestion
{
Quiz = quiz,
TrueFalseAnswer = data.TrueFalseAnswer,
ImageId = data.Image?.Id,
AudioId = data.Audio?.Id,
Text = data.Text,
OrderIndex = quiz.Questions.Count,
};
// Transaction rolls back all changes if a failure occurs halfway through
using (var transaction = await _Db.Database.BeginTransactionAsync())
{
quiz.UpdatedAt = DateTime.UtcNow;
// Generate question ID
await _Db.AddAsync(question);
await _Db.SaveChangesAsync();
// Generate IDs for each question, update question correctAnswerId
for (int i = 0; i < data.Answers?.Count; i++)
{
QuizAnswer answer = new QuizAnswer
{
QuizQuestionId = question.Id,
Text = data.Answers[i].Text,
ImageId = data.Answers[i].Image?.Id
};
await _Db.AddAsync(answer);
await _Db.SaveChangesAsync();
if (i == data.CorrectAnswerIndex)
{
question.CorrectAnswerId = answer.Id;
}
}
await _Db.SaveChangesAsync();
transaction.Commit();
}
return(Ok());
}
