// Create/Update/Delete methods
public async Task <Question> CreateQuestionAsync(Question question, string userId)
{
var access = await _quizzesRepository.HaveWriteAccessToQuiz(userId, question.QuizId);
if (!access)
{
return(null);
}
var creationTime = CurrentTime;
question.CreationTime = creationTime;
var questionVersion = new QuestionVersion {
CreationTime = creationTime,
Value = question.Value
};
question.Versions.Add(questionVersion);
question.FlatVersionProps();
await _questionsRepository.Create(question);
return(await Context.SaveChangesAsync() > 0
? question
: null);
}
public async Task <Question> UpdateQuestionAsync(long questionId, string value, string userId)
{
var question = await _questionsRepository
.GetAll()
.Where(a => a.Id == questionId)
.Where(a => !a.IsDeleted)
.SingleOrDefaultAsync();
if (question == null)
{
return(null);
}
var access = await _quizzesRepository.HaveWriteAccessToQuiz(userId, question.QuizId);
if (!access)
{
return(null);
}
var questionVersion = new QuestionVersion {
CreationTime = CurrentTime,
Value = value
};
question.Versions.Add(questionVersion);
_questionsRepository.Update(question);
var result = await Context.SaveChangesAsync() > 0;
if (!result)
{
return(null);
}
question.FlatVersionProps();
return(question);
}