/// <summary>
/// Initialize test
/// </summary>
/// <param name="subjectIds">Subject ids in which questions taking</param>
/// <param name="testType">Test type</param>
/// <param name="sourceType">See TestSourceTypes class</param>
/// <param name="source">Nullable id of source</param>
/// <returns></returns>
private ActionResult StartTest(IEnumerable <int> subjectIds, TestType testType, int sourceType, int?source)
{
if (subjectIds == null || !subjectIds.Any())
{
return(RedirectToAction("Index", "Home"));
}
var questionBank = new QuestionBank();
var questions =
_db.Questions.Where(
x => subjectIds.Contains(x.SubjectID) && x.IsPublished && x.Answers.Any());
if (!questions.Any())
{
return(RedirectToAction("Error", new { message = "Для теста не найдено ни одного вопроса. Обратитесь к администратору." }));
}
for (int i = 1; i <= 10; i++)
{
questionBank.Questions.Add(new List <int>(questions.Where(x => x.Difficulty == i).Select(x => x.ID)));
}
var testData = new TestData
{
TestCompleted = false,
TrueDifficultyLevel = 5,
SubjectsIds = subjectIds.ToList(),
QuestionBank = questionBank,
Started = TimeManager.GetCurrentTime(),
TestType = testType,
MaxAmountOfQuestions = _db.Questions.Count(x => subjectIds.Contains(x.SubjectID) && x.IsPublished),
SourceType = sourceType,
Source = source,
};
Question selectedQuestion = GetQuestion(testData);
testData.TestSeed = TemplateManager.GetRandomSeed();
testData.CurrentQuestionDifficulty = selectedQuestion.Difficulty;
testData.CurrentQuestionId = selectedQuestion.ID;
SetTestData(testData);
return(RedirectToAction("Index"));
}
/// <summary>
/// Calculate best difficulty level based on pass/fail attempts
/// </summary>
/// <param name="question">Question</param>
public static int GetQuestionBestDifficultyLevel(Question question)
{
var result = (question.TotalAttempts == 0) ? 5 : 10 - (int)(Math.Round((float)question.RightAttempts * 10 / question.TotalAttempts));
return (result == 0) ? 1 : result;
}
public ActionResult CreateAndContinue(Question question)
{
return Create(question, "Question");
}
public ActionResult CreateAndBack(Question question)
{
return Create(question, "Subject");
}
/// <summary>
/// Creates question
/// </summary>
/// <param name="question"></param>
/// <param name="controller">Controller name for redirection</param>
/// <returns></returns>
private ActionResult Create(Question question, string controller)
{
if (ModelState.IsValid)
{
_db.Questions.AddObject(question);
_db.SaveChanges();
return RedirectToAction("Edit", controller,
new { id = question.ID });
}
ViewBag.Types = GetQuestionTypes();
return View("Create");
}
public ActionResult Edit(Question question)
{
if (ModelState.IsValid)
{
_db.Questions.Attach(question);
_db.ObjectStateManager.ChangeObjectState(question,EntityState.Modified);
_db.SaveChanges();
}
ViewBag.Types = GetQuestionTypes();
return View(question);
}
/// <summary>
/// Deprecated Method for adding a new object to the Questions EntitySet. Consider using the .Add method of the associated ObjectSet<T> property instead.
/// </summary>
public void AddToQuestions(Question question)
{
base.AddObject("Questions", question);
}
/// <summary>
/// Create a new Question object.
/// </summary>
/// <param name="id">Initial value of the ID property.</param>
/// <param name="body">Initial value of the Body property.</param>
/// <param name="difficulty">Initial value of the Difficulty property.</param>
/// <param name="subjectID">Initial value of the SubjectID property.</param>
/// <param name="questionTypeID">Initial value of the QuestionTypeID property.</param>
/// <param name="isPublished">Initial value of the IsPublished property.</param>
/// <param name="totalAttempts">Initial value of the TotalAttempts property.</param>
/// <param name="rightAttempts">Initial value of the RightAttempts property.</param>
public static Question CreateQuestion(global::System.Int32 id, global::System.String body, global::System.Int32 difficulty, global::System.Int32 subjectID, global::System.Int32 questionTypeID, global::System.Boolean isPublished, global::System.Int32 totalAttempts, global::System.Int32 rightAttempts)
{
Question question = new Question();
question.ID = id;
question.Body = body;
question.Difficulty = difficulty;
question.SubjectID = subjectID;
question.QuestionTypeID = questionTypeID;
question.IsPublished = isPublished;
question.TotalAttempts = totalAttempts;
question.RightAttempts = rightAttempts;
return question;
}
public ActionResult Process(FormCollection collection)
{
// Geting session information
int sessionId = 0;
TestData testData = GetTestData(out sessionId);
// If test data is bad ending survey
if (testData == null)
{
return(RedirectToAction("End"));
}
// If bad question token (for example student are trying to answer question previously cached in browser) redirecting to Index (will show last generated question)
if (collection["QuestionToken"] != testData.GetQuestionHash())
{
return(RedirectToAction("Index"));
}
// Get previous question to check asnwer is correct
GeneratedQuestion question =
TemplateManager.Generate(testData.CurrentQuestionId,
testData.TestSeed);
// Remembering some nessasary data
testData.ItemsTaken++;
testData.TotalDifficultiesUsed += testData.CurrentQuestionDifficulty;
// Calculating the amount that will change the difficulty
double difficultyShift = 0.2 + (float)2 / testData.ItemsTaken;
// Checking answer is correct
bool answerIsCorrect = CheckAnswerIsCorrect(question, collection["Answers"]);
// Saving to question information about its own statistic
QuestionController.AddAttempt(testData.CurrentQuestionId, answerIsCorrect);
// Adding data to 'ResultGraph'
testData.AddPointToResultGraph(answerIsCorrect);
// TODO: Temperory method for statistics. (Re)move
testData.AddPointToRDF();
// Correcting difficulty
if (answerIsCorrect)
{
testData.TrueDifficultyLevel += difficultyShift;
if (testData.TrueDifficultyLevel > 10)
{
testData.TrueDifficultyLevel = 10;
}
testData.RightAnswersCount++;
}
else
{
testData.TrueDifficultyLevel -= difficultyShift;
if (testData.TrueDifficultyLevel < 1)
{
testData.TrueDifficultyLevel = 1;
}
}
// TODO: Make CONST optional. For the next programmers' generation
// Checking if measurement error lower than CONST
var error = testData.CalculateError();
var measure = testData.CalculateMeasure();
if (error <= 0.5)
{
testData.TestCompleted = true;
}
if (measure + error <= 1 || measure - error >= 10)
{
testData.TestCompleted = true;
}
//Check for test min length
// TODO: Add some behaviors. For the next programmers' generation. For example different options for different test types.
// If amount of taken question equals amount of total questions in test, mark test as completed.
if (testData.ItemsTaken >= testData.MaxAmountOfQuestions)
{
testData.TestCompleted = true;
}
// TODO: Add min length to test data
else if (testData.ItemsTaken < 10)
{
testData.TestCompleted = false;
}
// Selecting next question
Question selectedQuestion = GetQuestion(testData);
// Generates random seed, which helps to generate the same question from tamplate, if needed
testData.TestSeed = TemplateManager.GetRandomSeed();
// Remembering next question parameters
testData.CurrentQuestionDifficulty = selectedQuestion.Difficulty;
testData.CurrentQuestionId = selectedQuestion.ID;
// Saving test session
SetTestData(testData, sessionId);
// Continue test or end it depending on TestCompleted flag
return((testData.TestCompleted) ? RedirectToAction("End") : RedirectToAction("Index"));
}
/// <summary>
/// Returns GeneratedQuestion
/// </summary>
/// <param name = "templateId">Template id</param>
/// <param name = "seed">Random seed</param>
/// <returns></returns>
public static GeneratedQuestion Generate(int templateId, int seed)
{
var result = new GeneratedQuestion();
var rnd = new Random(seed);
// Get template from _db
Question question =
Db.Questions.FirstOrDefault(q => q.ID == templateId);
if (question == null)
{
throw new Exception("Template not found");
}
result.Body = question.Body;
result.QuestionType = 1;
result.Answers = new List <GeneratedAnswer>();
// Insert definitions to Body
int tagsLength = TagStartInsert.Length + TagEndInsert.Length;
for (int i = 0; i < result.Body.Length - tagsLength; i++)
{
if (result.Body.Substring(i, TagStartInsert.Length) !=
TagStartInsert)
{
continue;
}
// We found start insert tag
int tagStartInsertPosition = i;
int definitionNamePosition = i + TagStartInsert.Length;
for (i = definitionNamePosition;
i < result.Body.Length - TagEndInsert.Length;
i++)
{
if (result.Body.Substring(i, TagEndInsert.Length) !=
TagEndInsert)
{
continue;
}
// We found end insert tag
string definitionName =
result.Body.Substring(definitionNamePosition,
i - definitionNamePosition);
if (!string.IsNullOrEmpty(definitionName))
{
// Get definition from _db
Definition definition =
Db.Definitions.FirstOrDefault(
d => d.Name == definitionName);
if (definition != null)
{
// Get examples to definition from _db
List <Example> examples =
definition.Examples.Where(e => !e.IsAntiExample)
.ToList();
if (examples.Count == 0)
{
throw new Exception("Definition has no examples");
}
Example example =
examples[rnd.Next(0, examples.Count)];
// Replacing
string oldSubstr = TagStartInsert + definitionName +
TagEndInsert;
result.Body = result.Body.Replace(oldSubstr,
example.Value.Trim
());
i = tagStartInsertPosition + example.Value.Length -
1;
}
}
break;
}
}
// Get answers from _db
List <Answer> answers = question.Answers.ToList();
if (answers.Count == 0)
{
throw new Exception("Question has no answers");
}
foreach (Answer answer in answers)
{
var newAnswer = new GeneratedAnswer
{
Body = answer.Body,
IsCorrect = answer.IsCorrect
};
result.Answers.Add(newAnswer);
}
result.QuestionType = question.QuestionTypeID;
return(result);
}
