public async Task <OperationDetails> UpdateAsync(AnswerDTO item, string userId)
{
try
{
// Checking for: Does the current user has a role - "admin"?
bool isAdmin = BLLRepository.IsAdmin(Database, userId);
// Checking for: Does the current user have permission for updating answers from the test creator?
int courseId = (await Database.Question.GetAsync(item.QuestionId)).Topic.CourseId;
IEnumerable <CourseAssignment> assignments = Database.CourseAssignment.Find(obj => obj.CourseId == courseId);
bool isCourseAssigned = (from assign in assignments
where assign.UserProfileId == userId
select assign).Count() > 0;
Course course = await Database.Course.GetAsync(courseId);
if (course.UserProfileId != userId && !isAdmin && !isCourseAssigned)
{
return(new OperationDetails(false, "You can't update this answer. This course has been created by other user so apply to the course creator for the permission.", "Answer"));
}
// Get the updated answer from DB by AnswerId.
Answer answer = await Database.Answer.GetAsync(item.AnswerId);
if (answer != null)
{
// Check the updated answer.
string answerType = (await Database.Question.GetAsync(item.QuestionId)).AnswerType.AnswerTypeDescription;
var answers = Database.Answer.Find(obj => obj.QuestionId == item.QuestionId);
int countOfExistedProperAnswersInQuestion = (from row in answers
where row.IsProper == true
select row).Count();
if (answer.IsProper)
{
countOfExistedProperAnswersInQuestion -= countOfExistedProperAnswersInQuestion;
}
if (!BLLRepository.CheckCountOfProperAnswers(answerType, item.IsProper,
countOfExistedProperAnswersInQuestion,
out string result))
{
return(new OperationDetails(false, result, "Answer"));
}
// Update the answer.
answer.AnswerText = item.AnswerText?.Trim();
answer.IsProper = item.IsProper;
answer.LastModifiedDateTime = DateTime.Now;
Database.Answer.Update(answer);
await Database.SaveAsync();
return(new OperationDetails(true, "Answer updating completed successfully.", "Answer"));
}
return(new OperationDetails(false, "Answer with this Id doesn't exists.", "Answer"));
}
catch (Exception ex)
{
return(new OperationDetails(false, ex.Message, "Answer"));
}
}