public ActionResult CreateQuestion(QuestionEditViewModel vm)
{
List<string> messages = new List<string>();
var val = validateQuestion(vm);
vm.Id = null;
try
{
if (val.Item1 == true)
{
var question = CreateQuestionFromViewModel(vm);
QuestionManager.Insert(question);
UnitOfWork.Commit();
messages.Add("Question created succesfully.");
}
else
{
messages.Add(val.Item2);
}
}
catch (Exception)
{
//TODO: Add logging here
throw;
}
return Json(val);
}
private Tuple<bool, string> validateQuestion(QuestionEditViewModel vm)
{
if(String.IsNullOrWhiteSpace(vm.QuestionText))
return new Tuple<bool, string>(false,"Question text is empty");
if(vm.AnswerOptions==null)
return new Tuple<bool, string>(false,"Question must have at least 2 answer options");
if(vm.AnswerOptions.Count<2)
return new Tuple<bool, string>(false,"You need 2 or more answer options");
if(!vm.AnswerOptions.Any(ans => ans.Correct))
return new Tuple<bool, string>(false, "At least one answer needs to be correct");
if(vm.AnswerOptions.Count(ans => String.IsNullOrWhiteSpace(ans.AnswerText)==true)>0)
return new Tuple<bool, string>(false,"Question cannot contain empty answers");
return new Tuple<bool, string>(true,"Question data validated correctly");
}
private Question CreateQuestionFromViewModel(QuestionEditViewModel vm)
{
Question q = new Question() {QuestionText = vm.QuestionText, Id = vm.Id, QuestionAnswerType = vm.AnswerType};
int id = 1;
q.AnswerOptions = new List<Tuple<int, string, bool>>();
foreach (AnswerOptionViewModel answerOptionViewModel in vm.AnswerOptions)
{
q.AnswerOptions.Add(new Tuple<int, string, bool>(id,answerOptionViewModel.AnswerText,answerOptionViewModel.Correct));
id++;
}
return q;
}
