Last post Jun 22, 2018 09:03 AM by WatcherR
Jun 21, 2018 09:49 PM|stefanivovic|LINK
i have problem with many-to-many relationship. ive implemented GenericRepository and UnitOfWork pattern.
i have 2 entities, Test and Question
the problem is that when i call these 2 entities from database and want to link them in link table ef is duplicating then in their respective tables. I believe this could be solved with using(var context = new MyDbContext()) statement and linking them inside
that using statement but unfortunately UnitOfWork dont allow that, so ive tried using (var scope = new TransactionScope()) with no luck.
for example: i have 5 questions in database and 3 answers for each question and after user is done with test i figure out user score and insert new test row with some data. link table is here to show what questions did user had for that test. when i save
test entity every single question and answer is duplicated to database.
here is the code for reference, thanks
public int SaveTestResult(TestEntity testEntity)
using (var scope = new TransactionScope() )
testEntity.Questions = testEntity.Questions.OrderBy(q => q.Id).ToList();
var idlist = testEntity.Questions.Select(x => x.Id).ToList(); // get ids from list of questions from testentity
//note:i believe this line is causing that behaviour
var questionss = _unitOfWork.QuestionRepository.GetMany(q => idlist.Contains(q.Id)).OrderBy(q => q.Id).ToList();//get questions from ids and sort them by id
var questions = AutoMapper.Mapper.Map<List<Question>, List<QuestionEntity>>(questionss); //map from Question from db to QuestionEntity
testEntity.Questions = testEntity.Questions.OrderBy(q => q.Id).ToList();//sort testEtities questions id to match questions above
var number= 0;
for (int i = 0; i < testEntity.Questions.Count; i++)
for (int j = 0; j < testEntity.Questions[i].Answers.Count; j++)
if ((testEntity.Questions[i].Answers[j].IsTrueUserChoice == questions[i].Answers[j].IsTrue) && (questions[i].Answers[j].IsTrue == true))
testEntity.TestScore = number;
testEntity.Questions = questions;//ading questions from db so model validation would pass. quesiton from testEntiy are not valid, some properties are missing
var testDb = new Test();
testDb.TestTime = (testDb.TestDateEnd - testEntity.TestDateStart).Value;
testDb.TestDateStart = testEntity.TestDateStart.Value;
testDb.TestScore = testEntity.TestScore;
testDb.UserId = testEntity.UserId;
testDb.Questions = AutoMapper.Mapper.Map<List<QuestionEntity>, List<Question>>(testEntity.Questions);
Jun 22, 2018 09:03 AM|WatcherR|LINK
please post the models and how the context like to help reproduce .