/// <summary>
/// Overload of SaveAnswer for a multiple choice question.
/// It will verify if the user is the owner and if the already answer exists.
/// Create a new answer in case of it is required, or save the values in the
/// existing answer.
/// </summary>
/// <param name="answer">Answer to be persisted</param>
/// <returns></returns>
public ResultOperation SaveAnswer(MultipleChoiceAnswerView answer)
{
//It calls the method SaveAnswer that has a default routine for saving, and
//gives two delegates, the first to be executed in case of Inclusion and the
//second in case of Update.
return(this.SaveAnswer(answer,
repository =>
{
var newAnswer = new Domain.MultipleChoiceAnswer()
{
MultipleChoice_Choices = new List <Choice>()
};
for (int i = 0; i < answer.IdAnswers.Count; i++)
{
newAnswer.MultipleChoice_Choices.Add(new Choice()
{
// ensure that the choice exists
IdChoice = repository.GetMultipleChoiceOption(answer.IdAnswers[i]).Id
});
}
return newAnswer;
},
(repository, updatedItem) =>
{
//in case of update
Domain.MultipleChoiceAnswer multipleChoiceAnswer = repository.GetMultipleChoiceAnswer(updatedItem.Id);
var deleted = multipleChoiceAnswer.MultipleChoice_Choices.Where(
r => !answer.IdAnswers.Contains(r.IdChoice)
).ToList();
foreach (var item in answer.IdAnswers.Where(r =>
!multipleChoiceAnswer.MultipleChoice_Choices.Any(choice => choice.IdChoice == r)))
{
multipleChoiceAnswer.MultipleChoice_Choices.Add
(
new Choice()
{
// ensure that the choice exists
IdChoice = repository.GetMultipleChoiceOption(item).Id
}
);
}
if (deleted != null && deleted.Any())
{
deleted.ForEach(r => multipleChoiceAnswer.MultipleChoice_Choices.Remove(r));
}
return true;
}));
}
/// <summary>
/// Create the specific AnswerView based on the question type.
/// Can return a TrueFalseAnswerview, MultipleChoiceAnswerView or OpenEndedAnswerView
/// </summary>
/// <param name="repository"></param>
/// <param name="answer"></param>
/// <param name="idQuestion"></param>
/// <param name="infoAnswer"></param>
/// <returns></returns>
private AnswerModelViewBase CreateAnswerModelView(IRepository repository,
Answer answer, int idQuestion, Domain.AnswerQuestionOption infoAnswer)
{
AnswerModelViewBase returnAnswer = null;
switch (repository.GetQuestion(idQuestion).QuestionType)
{
case QuestionType.TrueFalse_Question:
returnAnswer = new TrueFalseAnswerView()
{
Option = (infoAnswer as TrueFalseAnswer).Choice
};
break;
case QuestionType.Multiple_Choice:
returnAnswer = new MultipleChoiceAnswerView()
{
IdAnswers = new List <int>()
};
foreach (var item in repository.GetMultipleChoiceAnswer(answer.Id, idQuestion).MultipleChoice_Choices)
{
(returnAnswer as MultipleChoiceAnswerView).IdAnswers.Add(item.IdChoice);
}
break;
case QuestionType.Open_Ended:
returnAnswer = new OpenEndedAnswerView()
{
Content = (infoAnswer as OpenEnded).Response
};
break;
}
return(returnAnswer);
}
