public IEnumerable <QuestionDto> GetQuestionsForTest(CreateTestQuery query, string userId)
{
// Get all public questions
IEnumerable <Question> publicQuestions = _entities.Where(q => q.AccessModifier == (int)AccessModifier.Public);
// Filter questions with at least one skill from the query skills
List <Question> questions = publicQuestions.Where(q =>
(Utils.ConvertStringIdsToList(q.TestedSkills))
.Join(query.SkillIds, qSid => qSid, sId => sId, (qSid, sId) => sId)
.Count() > 0).ToList();
List <QuestionDto> questionDtos = Mapper.Map <IEnumerable <Question>, IEnumerable <QuestionDto> >(questions).ToList();
// Create the Mathcing Vector of the query
int matchingVectorLength = (int)MatchingVectorIndex.StartOfSkills + new SkillsRepository(_context).Count();
double[] queryMatchingVector = new double[matchingVectorLength];
queryMatchingVector = BuildMatchingVector
(
queryMatchingVector,
query.DifficultyLevel,
query.SkillIds
);
double[] questionMatchingVector = new double[matchingVectorLength];
for (int i = 0; i < questionDtos.Count; i++)
{
// Create the Mathcing Vector of the question
Array.Clear(questionMatchingVector, 0, questionMatchingVector.Length);
questionMatchingVector = BuildMatchingVector
(
questionMatchingVector,
questions[i].Rank,
Utils.ConvertStringIdsToList(questions[i].TestedSkills)
);
// Calculate vectors distance
double sum = 0;
for (int j = 0; j < queryMatchingVector.Length; j++)
{
sum += Math.Pow(questionMatchingVector[j] - queryMatchingVector[j], 2);
}
questionDtos[i].MatchingDistance = Math.Sqrt(sum);
}
// Return results ordered by distance
return(questionDtos.OrderBy(q => q.MatchingDistance));
}
public IEnumerable <QuestionDto> SearchQuestionsForTest([FromBody] CreateTestQuery query)
{
IEnumerable <QuestionDto> results = null;
try
{
QuestionsRepository repository = new QuestionsRepository(_appDbContext);
var questionDtos = repository.GetQuestionsForTest(query, _clientData.Id);
results = repository.IncludeSkills(questionDtos);
}
catch (Exception e)
{
_log.LogError(e, "Error searching questions for test");
}
return(results);
}
