/** * Selects the next question base appropriate for the quiz attempt passed * @param Model_Quiz_QuizAttempt $vQuizAttempt * @param boolean $debug Being Phased out TODO * @throws Exception * @return Model_Quiz_QuestionBase|NULL NULL Should only be returned in exceptional circumstances */ public static function select_next_question($vQuizAttempt, $debug = false) { //Get all the concepts this quiz tests $vQuiz = $vQuizAttempt->getQuiz(); $vTestedConcepts = $vQuiz->getTestedConcepts(); if (sizeof($vTestedConcepts) < 1) { throw new Exception("This quiz is not ready yet - reason: No testedConcepts specified."); } //Foreach concept tested, see how many questions we've attempted foreach ($vTestedConcepts as $vTestedConcept) { Model_Shell_Debug::getInstance()->log("Looking at TestedConcept: " . $vTestedConcept->getConcept()->getConcept_name()); $vQuestionAttempts = Model_Quiz_QuestionAttempt::getAllFromQuizAttemptAndConcept($vQuizAttempt, $vTestedConcept->getConcept()); Model_Shell_Debug::getInstance()->log("Done " . sizeof($vQuestionAttempts) . "/" . $vTestedConcept->getNumber_tested()); //If we haven't attempted enough in this concept, we need to choose a question difficulty if (sizeof($vQuestionAttempts) < $vTestedConcept->getNumber_tested()) { //What difficulties are there being tested within this concept? $vLowest = $vTestedConcept->getLower_difficulty(); $vHighest = $vTestedConcept->getHigher_difficulty(); //Find out how many questions I should allocate for each difficulty $mQuestionsPerDifficultyLevel = floor(0.8 / ($vHighest + 1 - $vLowest) * $vTestedConcept->getNumber_tested()); $mBuffer = $vTestedConcept->getNumber_tested() - ($vHighest + 1 - $vLowest) * $mQuestionsPerDifficultyLevel; //If there's only one difficulty, that settles that if ($vLowest == $vHighest) { return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vLowest); } //Were there any previous attempts at this concept? If not, we need to start a Q at the lowest specified difficulty $vQuestionAttempts = $vQuizAttempt->getQuestionAttempts($vTestedConcept->getConcept()); //echo "Size of vQuestionAttempts:".sizeof($vQuestionAttempts)."<br/>"; if (sizeof($vQuestionAttempts) == 0) { return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vLowest); } //Find the highest attempted difficulty done so far $vHighestSoFar = $vQuizAttempt->getHighestDifficultyTestedSoFar(); //echo "The highest difficulty so far: $vHighestSoFar<br/>"; if ($vHighestSoFar >= $vHighest) { //Already at the highest difficulty, the next question will be at this difficulty too return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vHighest); } //Look at the last attempts in this difficulty. Were they below-par (use a percentage?)? $vTotal = 0; $vTotalRight = 0; Model_Shell_Debug::getInstance()->log("Checking your previous attempts...Size of vQuestionAttempts:" . sizeof($vQuestionAttempts)); foreach ($vQuestionAttempts as $vQA) { $vQB = $vQA->getQuestion_base(); //echo "Looking at " . $vQB->getDifficulty() . " vs $vHighestSoFar<br/>"; if ($vQB->getDifficulty() == $vHighestSoFar) { $vTotal++; if ($vQB->getEstimated_time() > $vQA->getTime_finished() - $vQA->getTime_started()) { //You did this question in a reasonable time... did you get it right first time? if ($vQA->getInitial_result() == "1") { $vTotalRight++; } } } } //Note, a divide by 0 happened here before... if ($vTotal == 0 || $vTotalRight / $vTotal > 0.8) { //OK. If they WERE good attempts, I should move on if I've hit my quota for this difficulty if ($vTotal >= $mQuestionsPerDifficultyLevel) { //Reached our minumum quota for this difficulty level. NEXT! return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vHighestSoFar + 1); } else { //We've done well so far, but we need to do more in this difficulty return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vHighestSoFar); } } else { //Your previous attempts weren't all that good. //Figure out how much buffer we have left. Can we afford to give you a question at $vHighestSoFar? Or do we have to move onto something harder? $mBuffer = $vTestedConcept->getNumber_tested() - ($vHighest - $vHighestSoFar) * $mQuestionsPerDifficultyLevel - sizeof($vQuestionAttempts); if ($mBuffer > 1) { //We can afford to give you another easier question return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vHighestSoFar); } else { //Sorry.. buffer is dry. You weren't going too well, but you gotta do the harder stuff return Model_Shell_QuestionChooser::select_next_question_2($vQuizAttempt, $vTestedConcept->getConcept(), $vHighestSoFar + 1); } } } //End If } //End Foreach testedConcept //We shouldn't really ever get here, but in case we do -> null return null; }
/** * This action is the quiz shell. * It ensures permissions, creates new attempts etc etc. * * @author Ben Evans */ public function attemptAction() { Model_Shell_Debug::getInstance()->log("User Entered the Attempt Action"); $identity = Zend_Auth::getInstance()->getIdentity(); $username = $identity->username; $auth_model = Model_Auth_General::getAuthModel(); /* Before we do anything, test to make sure we've passed a VALID QUIZ which WE ARE ENTITLED to sit. */ $quiz_id = $this->_getParam("quiz"); if (is_null($quiz_id)) { throw new Exception("No quiz was passed. Cannot continue."); } $vQuiz = Model_Quiz_Quiz::fromID($quiz_id); if ($vQuiz == null) { throw new Exception("Quiz ID passed was invalid. Cannot continue."); } $mFinished = false; $mMarking = false; //Permissions if ($auth_model->userInGroup($username, $vQuiz->getPermissions_group()) && $vQuiz->getOpen_date() <= strtotime("now")) { //Have we run out of attempts? $vAttempts = Model_Quiz_QuizAttempt::getAllFromUser($username, $vQuiz); if (sizeof($vAttempts) >= $vQuiz->getMax_attempts()) { //It is possible that we're on our last attempt, and that it's "in progress"...check $bInProgress = false; foreach ($vAttempts as $vAttempt) { if ($vAttempt->getDate_finished() == null) { $bInProgress = true; } } if (!$bInProgress) { throw new Exception("You've exceeded your maximum attempts for this quiz. Cannot continue"); } } } else { if (!$this->view->is_admin) { throw new Exception("Insufficient Permissions to take this quiz / Quiz not open yet"); } $vAttempts = Model_Quiz_QuizAttempt::getAllFromUser($username, $vQuiz); } /* Ok. We're allowed to TAKE the quiz. Are we resuming, or starting a new one? */ $mQuizAttempt = null; if (is_array($vAttempts)) { foreach ($vAttempts as $vAttempt) { if ($vAttempt->getDate_finished() == null) { $mQuizAttempt = $vAttempt; break; } } //End Foreach } //End If if ($mQuizAttempt == null) { $mQuizAttempt = Model_Quiz_QuizAttempt::fromScratch(strtotime("now"), $vQuiz, $username); } /* Calculate the total questions needed for this quiz */ $vTCs = $vQuiz->getTestedConcepts(); $vTotalQuestions = 0; foreach ($vTCs as $vTC) { $vTotalQuestions = $vTotalQuestions + $vTC->getNumber_tested(); } /* We have our quizAttempt ready to go. Now we look to see if we're resuming a question or not */ $mQuestionAttempt = $mQuizAttempt->getLastIncompleteQuestion(); if (is_object($mQuestionAttempt) && !$mQuestionAttempt->isValid()) { $mQuestionAttempt->destroy(); // Remove the Question attempt (Database was reinitialised or something) $mQuestionAttempt = null; } if ($mQuestionAttempt != null) { /* Are we getting an ANSWER for this question? */ if (array_key_exists("marking", $_POST) && $_POST['marking'] == "1") { /* Mark it */ $mMarking = true; } /* If we reach here, the page has probably been refreshed. We just re-display the last question */ } else { /* Have we finished this quiz? */ if ($mQuizAttempt->getQuestionAttemptCount() >= $vTotalQuestions) { //Close this attempt and display a result later on down the page $mQuizAttempt->setDate_finished(strtotime("now")); //Calculate and store the final score $mQuizAttempt->setTotal_score($mQuizAttempt->getTotal_score()); $mFinished = true; } else { /* QuizAttempt isn't finished... Fetch a questionBase */ $vQuestionBase = Model_Shell_QuestionChooser::select_next_question($mQuizAttempt, true); /* Make a GeneratedQuestion */ $vCounter = 0; //Make sure we don't get any fluke no-text answers while ($vCounter < 3) { Model_Shell_Debug::getInstance()->log("vQuestionBase: " . isset($vQuestionBase)); Model_Shell_Debug::getInstance()->log("Generating... from " . $vQuestionBase->getXml()); $vGen = Model_Quiz_GeneratedQuestion::fromQuestionBase($vQuestionBase); if ($vGen->getCorrect_answer() != "" && $vGen->getCorrect_answer() != "\r\n") { break; } else { $vGen->remove(); } $vCounter++; } if ($vGen->getCorrect_answer() == "" || $vGen->getCorrect_answer() == "\r\n") { throw new Exception("Error. While generating a question for you, blank answers appeared > 3 times. This should never happen. Either try to refresh this page, or consult your lecturer..."); } /* Make a QuestionAttempt */ $mQuestionAttempt = Model_Quiz_QuestionAttempt::fromScratch($vQuestionBase, strtotime("now"), strtotime("now"), $mQuizAttempt, $vGen); } //End-if_finished_quizAttempt } // Pass all relevant information to the view $this->view->quiz = $vQuiz; $this->view->question_attempt = $mQuestionAttempt; $this->view->finished = $mFinished; $this->view->marking = $mMarking; $this->view->mQuizAttempt = $mQuizAttempt; $this->view->vTotalQuestions = $vTotalQuestions; }
/** * Shows the Question Analysis */ public function questionanalysisAction() { $file_id = $this->_getParam("file"); $this->view->file = $file_id; // Pointless line to load all the other functions in the GeneratedQuestion File // TODO: Fix this PLEASE $tmp = new Model_Quiz_GeneratedQuestion(); // Get All Question Bases $this->view->all_question_bases = Model_Quiz_QuestionBase::getAll(); if (is_null($file_id) || !isset($file_id)) { $default_question_base = current($this->view->all_question_bases); $file_id = $default_question_base->getID(); } if (!is_null($file_id) && isset($file_id)) { $question_base = Model_Quiz_QuestionBase::fromID($file_id); $attempts = Model_Quiz_QuestionAttempt::getAllFromQuestionBase($question_base); // Generate a sample question $config = new Zend_Config_Ini(APPLICATION_PATH . "/configs/application.ini", APPLICATION_ENV); $path = $config->xml->import_path; //$sample_question = new Model_Shell_GenericQuestion(APPLICATION_PATH . "/../xml/questions/" . $question_base->getXml()); $sample_question = new Model_Shell_GenericQuestion($path . '/' . $question_base->getXml()); $this->view->question_base = $question_base; $this->view->attempts = $attempts; $this->view->sample_question = $sample_question; } }
/** * Gets all Question attempts for a given question * * @param string $vQB * @return void * @author Ben Evans */ public static function getAllFromQuestionBase(Model_Quiz_QuestionBase $vQB) { $db = Zend_Registry::get("db"); $vReturn = array(); $sql = "SELECT attempt_id FROM question_attempt WHERE question_basequestion_id=" . $db->quote($vQB->getID()); //echo $sql; $result = $db->query($sql); $rows = $result->fetchAll(); foreach ($rows as $row) { $vReturn[] = Model_Quiz_QuestionAttempt::fromID($row['attempt_id']); } return $vReturn; }
protected function makeQuestionAttempt($quizAttempt, $now) { $questionBase = Model_Shell_QuestionChooser::select_next_question($quizAttempt, true); $path = $this->getFrontController()->getParam('xml_path'); // This way we can set it externally from our tests. If not set, called code will just use the configuration value /* Make a GeneratedQuestion */ $cnt = 0; // Make sure we don't get any fluke no-text answers while ($cnt < 3) { Model_Shell_Debug::getInstance()->log("vQuestionBase: " . isset($questionBase)); Model_Shell_Debug::getInstance()->log("Generating... from " . $questionBase->getXml()); $vGen = Model_Quiz_GeneratedQuestion::fromQuestionBase($questionBase, $path); if ($vGen->getCorrect_answer() != "" && $vGen->getCorrect_answer() != "\r\n") { break; } else { $vGen->remove(); } $cnt++; } if ($vGen->getCorrect_answer() == "" || $vGen->getCorrect_answer() == "\r\n") { throw new Exception("Error. While generating a question for you, blank answers appeared > 3 times. This should never happen. Either try to refresh this page, or consult your lecturer..."); } /* Make a QuestionAttempt */ return Model_Quiz_QuestionAttempt::fromScratch($questionBase, $now, $now, $quizAttempt, $vGen); }
/** * Gets the last incomplete Question Attempt for this quiz * @return Model_Quiz_QuestionAttempt|NULL */ public function getLastIncompleteQuestion() { $db = Zend_Registry::get("db"); $sql = "SELECT attempt_id FROM question_attempt WHERE time_finished IS NULL AND quiz_attemptquiz_attempt_id=" . $db->quote($this->quiz_attempt_id) . " ORDER BY attempt_id DESC"; $result = $db->query($sql); $row = $result->fetch(); return Model_Quiz_QuestionAttempt::fromID($row['attempt_id']); }