class.ilTestSequenceDynamicQuestionSet.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once 'Modules/Test/interfaces/interface.ilTestSequenceSummaryProvider.php';

class ilTestSequenceDynamicQuestionSet implements ilTestSequenceSummaryProvider
{
        private $db = null;
        
        private $questionSet = null;
        
        private $activeId = null;

        private $preventCheckedQuestionsFromComingUpEnabled;
        
        private $questionTracking = array();

        private $newlyTrackedQuestion;

        private $newlyTrackedQuestionsStatus;
        
        private $postponedQuestions = array();

        private $newlyPostponedQuestion;

        private $newlyPostponedQuestionsCount;

        private $alreadyCheckedQuestions;

        private $newlyCheckedQuestion;
        
        private $correctAnsweredQuestions = array();
        
        private $wrongAnsweredQuestions = array();

        private $newlyAnsweredQuestion;

        private $newlyAnsweredQuestionsAnswerStatus;

        private $currentQuestionId;
        
        public function __construct(ilDBInterface $db, ilTestDynamicQuestionSet $questionSet, $activeId)
        {
                $this->db = $db;
                $this->questionSet = $questionSet;
                $this->activeId = $activeId;

                $this->newlyTrackedQuestion = null;
                $this->newlyTrackedQuestionsStatus = null;
                
                $this->newlyPostponedQuestion = null;
                $this->newlyPostponedQuestionsCount = null;
                
                $this->newlyAnsweredQuestion = null;
                $this->newlyAnsweredQuestionsAnswerStatus = null;
                
                $this->alreadyCheckedQuestions = array();
                $this->newlyCheckedQuestion = null;

                $this->preventCheckedQuestionsFromComingUpEnabled = false;
                
                $this->currentQuestionId = null;
        }
        
        public function getActiveId()
        {
                return $this->activeId;
        }

        public function setPreventCheckedQuestionsFromComingUpEnabled($preventCheckedQuestionsFromComingUpEnabled)
        {
                $this->preventCheckedQuestionsFromComingUpEnabled = $preventCheckedQuestionsFromComingUpEnabled;
        }

        public function isPreventCheckedQuestionsFromComingUpEnabled()
        {
                return $this->preventCheckedQuestionsFromComingUpEnabled;
        }

        public function getCurrentQuestionId()
        {
                return $this->currentQuestionId;
        }

        public function setCurrentQuestionId($currentQuestionId)
        {
                $this->currentQuestionId = $currentQuestionId;
        }
        
        public function loadFromDb()
        {
                $this->loadQuestionTracking();
                $this->loadAnswerStatus();
                $this->loadPostponedQuestions();
                $this->loadCheckedQuestions();
        }
        
        private function loadQuestionTracking()
        {
                $query = "
                        SELECT          question_fi, status
                        FROM            tst_seq_qst_tracking
                        WHERE           active_fi = %s
                        AND                     pass = %s
                        ORDER BY        orderindex ASC
                ";
                
                $res = $this->db->queryF($query, array('integer','integer'), array($this->activeId, 0));

                $this->questionTracking = array();
                
                while( $row = $this->db->fetchAssoc($res) )
                {
                        $this->questionTracking[] = array(
                                'qid' => $row['question_fi'],
                                'status' => $row['status']
                        );
                }
        }
        
        private function loadAnswerStatus()
        {
                $query = "
                        SELECT  question_fi, correctness
                        FROM    tst_seq_qst_answstatus
                        WHERE   active_fi = %s
                        AND             pass = %s
                ";

                $res = $this->db->queryF($query, array('integer','integer'), array($this->activeId, 0));

                $this->correctAnsweredQuestions = array();
                $this->wrongAnsweredQuestions = array();

                while( $row = $this->db->fetchAssoc($res) )
                {
                        if( $row['correctness'] )
                        {
                                $this->correctAnsweredQuestions[ $row['question_fi'] ] = $row['question_fi'];
                        }
                        else
                        {
                                $this->wrongAnsweredQuestions[ $row['question_fi'] ] = $row['question_fi'];
                        }
                }
        }
        
        private function loadPostponedQuestions()
        {
                $query = "
                        SELECT  question_fi, cnt
                        FROM    tst_seq_qst_postponed
                        WHERE   active_fi = %s
                        AND             pass = %s
                ";

                $res = $this->db->queryF($query, array('integer','integer'), array($this->activeId, 0));
                
                $this->postponedQuestions = array();
                
                while( $row = $this->db->fetchAssoc($res) )
                {
                        $this->postponedQuestions[ $row['question_fi'] ] = $row['cnt'];
                }
        }

        private function loadCheckedQuestions()
        {
                $res = $this->db->queryF("SELECT question_fi FROM tst_seq_qst_checked WHERE active_fi = %s AND pass = %s",
                        array('integer','integer'), array($this->getActiveId(), 0)
                );

                while( $row = $this->db->fetchAssoc($res) )
                {
                        $this->alreadyCheckedQuestions[ $row['question_fi'] ] = $row['question_fi'];
                }
        }
        
        public function saveToDb()
        {
                $this->db->manipulateF(
                        "DELETE FROM tst_sequence WHERE active_fi = %s AND pass = %s",
                        array('integer','integer'), array($this->getActiveId(), 0)
                );

                $this->db->insert('tst_sequence', array(
                        'active_fi' => array('integer', $this->getActiveId()),
                        'pass' => array('integer', 0),
                        'sequence' => array('clob', null),
                        'postponed' => array('text', null),
                        'hidden' => array('text', null),
                        'tstamp' => array('integer', time())
                ));
                
                $this->saveNewlyTrackedQuestion();
                $this->saveNewlyAnsweredQuestionsAnswerStatus();
                $this->saveNewlyPostponedQuestion();
                $this->removeQuestionsNotPostponedAnymore();
                $this->saveNewlyCheckedQuestion();
                $this->removeQuestionsNotCheckedAnymore();
        }
        
        private function saveNewlyTrackedQuestion()
        {
                if( (int)$this->newlyTrackedQuestion )
                {
                        $newOrderIndex = $this->getNewOrderIndexForQuestionTracking();
                        
                        $this->db->replace('tst_seq_qst_tracking',
                                array(
                                        'active_fi' => array('integer', (int)$this->getActiveId()),
                                        'pass' => array('integer', 0),
                                        'question_fi' => array('integer', (int)$this->newlyTrackedQuestion)
                                ),
                                array(
                                        'status' => array('text', $this->newlyTrackedQuestionsStatus),
                                        'orderindex' => array('integer', $newOrderIndex)
                                )
                        );
                }
        }
        
        private function getNewOrderIndexForQuestionTracking()
        {
                $query = "
                                SELECT (MAX(orderindex) + 1) new_order_index
                                FROM tst_seq_qst_tracking
                                WHERE active_fi = %s
                                AND pass = %s
                        ";

                $res = $this->db->queryF($query, array('integer','integer'), array($this->getActiveId(), 0));
                
                $row = $this->db->fetchAssoc($res);

                if( $row['new_order_index'] )
                {
                        return $row['new_order_index'];
                }
                
                return 1;
        }

        private function saveNewlyAnsweredQuestionsAnswerStatus()
        {
                if( (int)$this->newlyAnsweredQuestion )
                {
                        $this->db->replace('tst_seq_qst_answstatus',
                                array(
                                        'active_fi' => array('integer', (int)$this->getActiveId()),
                                        'pass' => array('integer', 0),
                                        'question_fi' => array('integer', (int)$this->newlyAnsweredQuestion)
                                ),
                                array(
                                        'correctness' => array('integer', (int)$this->newlyAnsweredQuestionsAnswerStatus)
                                )
                        );
                }
        }

        private function saveNewlyPostponedQuestion()
        {
                if( (int)$this->newlyPostponedQuestion )
                {
                        $this->db->replace('tst_seq_qst_postponed',
                                array(
                                        'active_fi' => array('integer', (int)$this->getActiveId()),
                                        'pass' => array('integer', 0),
                                        'question_fi' => array('integer', (int)$this->newlyPostponedQuestion)
                                ),
                                array(
                                        'cnt' => array('integer', (int)$this->newlyPostponedQuestionsCount)
                                )
                        );
                }
        }
        
        private function removeQuestionsNotPostponedAnymore()
        {
                $INquestions = $this->db->in('question_fi', array_keys($this->postponedQuestions), true, 'integer');

                $query = "
                        DELETE FROM tst_seq_qst_postponed
                        WHERE active_fi = %s
                        AND pass = %s
                        AND $INquestions
                ";
                
                $this->db->manipulateF($query, array('integer','integer'), array($this->getActiveId(), 0));
        }
        
        private function saveNewlyCheckedQuestion()
        {
                if( (int)$this->newlyCheckedQuestion )
                {
                        $this->db->replace('tst_seq_qst_checked', array(
                                'active_fi' => array('integer', (int)$this->getActiveId()),
                                'pass' => array('integer', 0),
                                'question_fi' => array('integer', (int)$this->newlyCheckedQuestion)
                        ), array());
                }
        }
        
        private function removeQuestionsNotCheckedAnymore()
        {
                $NOT_IN_checkedQuestions = $this->db->in('question_fi', $this->alreadyCheckedQuestions, true, 'integer');

                // BEGIN: FIX IN QUERY
                if($NOT_IN_checkedQuestions == ' 1=2 ') $NOT_IN_checkedQuestions = ' 1=1 ';
                // END: FIX IN QUERY
                
                $query = "
                        DELETE FROM tst_seq_qst_checked
                        WHERE active_fi = %s
                        AND pass = %s
                        AND $NOT_IN_checkedQuestions
                ";
                
                $this->db->manipulateF($query, array('integer', 'integer'), array((int)$this->getActiveId(), 0));
        }
        
        public function loadQuestions(ilObjTestDynamicQuestionSetConfig $dynamicQuestionSetConfig, ilTestDynamicQuestionSetFilterSelection $filterSelection)
        {
                $this->questionSet->load($dynamicQuestionSetConfig, $filterSelection);

//              echo "<table><tr>";
//              echo "<td width='200'><pre>".print_r($this->questionSet->getActualQuestionSequence(), 1)."</pre></td>";
//              echo "<td width='200'><pre>".print_r($this->correctAnsweredQuestions, 1)."</pre></td>";
//              echo "<td width='200'><pre>".print_r($this->wrongAnsweredQuestions, 1)."</pre></td>";
//              echo "</tr></table>";
        }
        
        // -----------------------------------------------------------------------------------------------------------------
        
        public function cleanupQuestions(ilTestSessionDynamicQuestionSet $testSession)
        {
                switch( true )
                {
                        case !$this->questionSet->questionExists($testSession->getCurrentQuestionId()):
                        case !$this->isFilteredQuestion($testSession->getCurrentQuestionId()):
                                
                                $testSession->setCurrentQuestionId(null);
                }
                
                foreach($this->postponedQuestions as $questionId)
                {
                        if( !$this->questionSet->questionExists($questionId) )
                        {
                                unset($this->postponedQuestions[$questionId]);
                        }
                }
                
                foreach($this->wrongAnsweredQuestions as $questionId)
                {
                        if( !$this->questionSet->questionExists($questionId) )
                        {
                                unset($this->wrongAnsweredQuestions[$questionId]);
                        }
                }
                
                foreach($this->correctAnsweredQuestions as $questionId)
                {
                        if( !$this->questionSet->questionExists($questionId) )
                        {
                                unset($this->correctAnsweredQuestions[$questionId]);
                        }
                }
        }
        
        // -----------------------------------------------------------------------------------------------------------------
        
        public function getUpcomingQuestionId()
        {
                if( $questionId = $this->fetchUpcomingQuestionId(true, true) )
                        return $questionId;

                if( $questionId = $this->fetchUpcomingQuestionId(false, true) )
                        return $questionId;
                
                if( $questionId = $this->fetchUpcomingQuestionId(true, false) )
                        return $questionId;

                if( $questionId = $this->fetchUpcomingQuestionId(false, false) )
                        return $questionId;

                return null;
        }
        
        private function fetchUpcomingQuestionId($excludePostponedQuestions, $forceNonAnsweredQuestion)
        {
                foreach($this->questionSet->getActualQuestionSequence() as $level => $questions)
                {
                        $postponedQuestions = array();
                        
                        foreach($questions as $pos => $qId)
                        {
                                if( isset($this->correctAnsweredQuestions[$qId]) )
                                {
                                        continue;
                                }

                                if( $this->isPreventCheckedQuestionsFromComingUpEnabled() && $this->isQuestionChecked($qId) )
                                {
                                        continue;
                                }

                                if( $forceNonAnsweredQuestion && isset($this->wrongAnsweredQuestions[$qId]) )
                                {
                                        continue;
                                }
                                
                                if( isset($this->postponedQuestions[$qId]) )
                                {
                                        $postponedQuestions[$qId] = $this->postponedQuestions[$qId];
                                        continue;
                                }
                                
                                return $qId;
                        }
                        
                        if( !$excludePostponedQuestions && count($postponedQuestions) )
                        {
                                return $this->fetchMostLeastPostponedQuestion($postponedQuestions);
                        }
                }
                
                return null;
        }
        
        public function isAnsweredQuestion($questionId)
        {
                return (
                        isset($this->correctAnsweredQuestions[$questionId])
                        || isset($this->wrongAnsweredQuestions[$questionId])
                );
        }
        
        public function isPostponedQuestion($questionId)
        {
                return isset($this->postponedQuestions[$questionId]);
        }
        
        public function isFilteredQuestion($questionId)
        {
                foreach($this->questionSet->getActualQuestionSequence() as $level => $questions)
                {
                        if( in_array($questionId, $questions) )
                        {
                                return true;
                        }
                }
                
                return false;
        }
        
        public function trackedQuestionExists()
        {
                return (bool)count($this->questionTracking);
        }
        
        public function getTrackedQuestionList($currentQuestionId = null)
        {
                $questionList = array();
                
                if( $currentQuestionId )
                {
                        $questionList[$currentQuestionId] = $this->questionSet->getQuestionData($currentQuestionId);
                }
                
                foreach( array_reverse($this->questionTracking) as $trackedQuestion)
                {
                        if( !isset($questionList[ $trackedQuestion['qid'] ]) )
                        {
                                $questionList[ $trackedQuestion['qid'] ] = $this->questionSet->getQuestionData($trackedQuestion['qid']);
                        }
                }
                
                return $questionList;
        }
        
        public function resetTrackedQuestionList()
        {
                $this->questionTracking = array();
        }
        
        public function openQuestionExists()
        {
                return count($this->getOpenQuestions()) > 0;
        }
        
        public function getOpenQuestions()
        {
                $completeQuestionIds = array_keys( $this->questionSet->getAllQuestionsData() );

                $openQuestions = array_diff($completeQuestionIds, $this->correctAnsweredQuestions);
                
                return $openQuestions;
        }
        
        public function getTrackedQuestionCount()
        {
                $uniqueQuestions = array();
                
                foreach($this->questionTracking as $trackedQuestion)
                {
                        $uniqueQuestions[$trackedQuestion['qid']] = $trackedQuestion['qid'];
                }
                
                return count($uniqueQuestions);
        }
        
        public function getCurrentPositionIndex($questionId)
        {
                $i = 0;
                
                foreach($this->getSelectionOrderedSequence() as $qId)
                {
                        $i++;
                        
                        if($qId == $questionId)
                        {
                                return $i;
                        }
                }

                return null;
        }
        
        public function getLastPositionIndex()
        {
                return count($this->getSelectionOrderedSequence());
        }
        
        // -----------------------------------------------------------------------------------------------------------------

        public function setQuestionUnchecked($questionId)
        {
                unset($this->alreadyCheckedQuestions[$questionId]);
        }

        public function setQuestionChecked($questionId)
        {
                $this->newlyCheckedQuestion = $questionId;
                $this->alreadyCheckedQuestions[$questionId] = $questionId;
        }

        public function isQuestionChecked($questionId)
        {
                return isset($this->alreadyCheckedQuestions[$questionId]);
        }

        public function setQuestionPostponed($questionId)
        {
                $this->trackQuestion($questionId, 'postponed');
                
                if( !isset($this->postponedQuestions[$questionId]) )
                {
                        $this->postponedQuestions[$questionId] = 0;
                }
                
                $this->postponedQuestions[$questionId]++;
                
                $this->newlyPostponedQuestion = $questionId;
                $this->newlyPostponedQuestionsCount = $this->postponedQuestions[$questionId];
        }
        
        public function unsetQuestionPostponed($questionId)
        {
                if( isset($this->postponedQuestions[$questionId]) )
                        unset($this->postponedQuestions[$questionId]);
        }

        public function setQuestionAnsweredCorrect($questionId)
        {
                $this->trackQuestion($questionId, 'correct');
                
                $this->correctAnsweredQuestions[$questionId] = $questionId;
                
                if( isset($this->wrongAnsweredQuestions[$questionId]) )
                        unset($this->wrongAnsweredQuestions[$questionId]);
                
                $this->newlyAnsweredQuestion = $questionId;
                $this->newlyAnsweredQuestionsAnswerStatus = true;
        }

        public function setQuestionAnsweredWrong($questionId)
        {
                $this->trackQuestion($questionId, 'wrong');
                
                $this->wrongAnsweredQuestions[$questionId] = $questionId;
                
                if( isset($this->correctAnsweredQuestions[$questionId]) )
                        unset($this->correctAnsweredQuestions[$questionId]);

                $this->newlyAnsweredQuestion = $questionId;
                $this->newlyAnsweredQuestionsAnswerStatus = false;
        }
        
        private function trackQuestion($questionId, $answerStatus)
        {
                $this->questionTracking[] = array(
                        'qid' => $questionId, 'status' => $answerStatus
                );
                
                $this->newlyTrackedQuestion = $questionId;
                $this->newlyTrackedQuestionsStatus = $answerStatus;
        }
        
        // -----------------------------------------------------------------------------------------------------------------
        
        public function hasStarted()
        {
                return $this->trackedQuestionExists();
        }

        // -----------------------------------------------------------------------------------------------------------------
        
        public function getQuestionSet()
        {
                return $this->questionSet;
        }
        
        public function getCompleteQuestionsData()
        {
                return $this->questionSet->getCompleteQuestionList()->getQuestionDataArray();
        }
        
        public function getFilteredQuestionsData()
        {
                return $this->questionSet->getFilteredQuestionList()->getQuestionDataArray();
        }

        // -----------------------------------------------------------------------------------------------------------------
        
        public function getUserSequenceQuestions()
        {
                //return array_keys( $this->getTrackedQuestionList() );
                
                $questionSequence = array();
                
                foreach( $this->questionSet->getActualQuestionSequence() as $level => $questions )
                {
                        $questionSequence = array_merge($questionSequence, $questions);
                }
                
                return $questionSequence;
        }

        private function fetchMostLeastPostponedQuestion($postponedQuestions)
        {
                $minPostponeCount = null;
                $minPostponeItem = null;

                foreach(array_reverse($postponedQuestions, true) as $qId => $postponeCount)
                {
                        if($minPostponeCount === null || $postponeCount <= $minPostponeCount)
                        {
                                $minPostponeCount = $postponeCount;
                                $minPostponeItem = $qId;
                        }
                }
                return $minPostponeItem;
        }

        public function getPass()
        {
                return 0;
        }

        // -----------------------------------------------------------------------------------------------------------------

        private function orderQuestionsByPostponeCount($postponedQuestions)
        {
                $maxPostponeCount = max($postponedQuestions);
                
                $orderedSequence = array();
                $postponedCountDomain = array_flip($postponedQuestions);
                
                for($i = 1; $i <= $maxPostponeCount; $i++)
                {
                        if(!isset($postponedCountDomain[$i]))
                        {
                                continue;       
                        }
                        
                        foreach($postponedQuestions as $qId => $postponeCount)
                        {
                                if($postponeCount == $i)
                                {
                                        $orderedSequence[] = $qId;
                                }
                        }
                }
                
                return $orderedSequence;
        }
        
        private function fetchQuestionSequence($nonPostponedQuestions, $nonAnsweredQuestions)
        {
                $questionSequence = array();
                
                foreach($this->questionSet->getActualQuestionSequence() as $level => $questions)
                {
                        $postponedQuestions = array();

                        foreach($questions as $pos => $qId)
                        {
                                if( isset($this->correctAnsweredQuestions[$qId]) )
                                {
                                        continue;
                                }

                                if( $nonAnsweredQuestions && isset($this->wrongAnsweredQuestions[$qId]) )
                                {
                                        continue;
                                }
                                elseif( !$nonAnsweredQuestions && !isset($this->wrongAnsweredQuestions[$qId]) )
                                {
                                        continue;
                                }

                                if( !$nonPostponedQuestions && isset($this->postponedQuestions[$qId]) )
                                {
                                        $postponedQuestions[$qId] = $this->postponedQuestions[$qId];
                                        continue;
                                }
                                elseif($nonPostponedQuestions && !isset($this->postponedQuestions[$qId]))
                                {
                                        $questionSequence[] = $qId;
                                }
                        }

                        if( !$nonPostponedQuestions && count($postponedQuestions) )
                        {
                                $questionSequence = array_merge(
                                        $questionSequence, $this->orderQuestionsByPostponeCount($postponedQuestions)
                                );
                        }
                }

                return $questionSequence;
        }
        
        private function fetchTrackedCorrectAnsweredSequence()
        {
                $questionSequence = array();
                
                foreach($this->questionTracking as $key => $question)
                {
                        $qId = $question['qid'];
                        
                        if( !isset($this->correctAnsweredQuestions[$qId]) )
                        {
                                continue;
                        }

                        $questionSequence[] = $qId;
                }

                return $questionSequence;
        }

        private function getOrderedSequence()
        {
                $correctAnsweredQuestions = $this->fetchTrackedCorrectAnsweredSequence();
                
                $nonAnsweredQuestions = $this->fetchQuestionSequence(
                        true, true
                );
                
                $postponedNonAnsweredQuestions = $this->fetchQuestionSequence(
                        false, true
                );
                
                $wrongAnsweredQuestions = $this->fetchQuestionSequence(
                        true, false
                );
                
                $postponedWrongAnsweredQuestions = $this->fetchQuestionSequence(
                        false, false
                );
                
                $questionOrder = array_merge( $correctAnsweredQuestions,
                        $nonAnsweredQuestions, $postponedNonAnsweredQuestions,
                        $wrongAnsweredQuestions, $postponedWrongAnsweredQuestions
                );

                return $questionOrder;
        }
        
        public function getSelectionOrderedSequence()
        {
                $sequence = array();
                
                foreach($this->getOrderedSequence() as $qId)
                {
                        if( !$this->getQuestionSet()->getSelectionQuestionList()->isInList($qId) )
                        {
                                continue;
                        }
                        
                        $sequence[] = $qId;
                }
                
                return $sequence;
        }

        public function getSequenceSummary($obligationsFilterEnabled = false)
        {
                $questionOrder = $this->getSelectionOrderedSequence();

                $solved_questions = ilObjTest::_getSolvedQuestions($this->getActiveId());

                $key = 1;
                
                $summary = array();

                foreach ($questionOrder as $qId)
                {
                        $question =& ilObjTest::_instanciateQuestion($qId);
                        if(is_object($question))
                        {
                                $worked_through = $question->_isWorkedThrough($this->getActiveId(), $question->getId(), $this->getPass());
                                $solved = 0;
                                if(array_key_exists($question->getId(), $solved_questions))
                                {
                                        $solved = $solved_questions[$question->getId()]["solved"];
                                }
                                
                                // do not show postponing, since this happens implicit on dircarding solutions (CTM only)
                                //$is_postponed = $this->isPostponedQuestion($question->getId());

                                $row = array("nr" => "$key", "title" => $question->getTitle(), "qid" => $question->getId(), "visited" => $worked_through, "solved" => (($solved) ? "1" : "0"), "description" => $question->getComment(), "points" => $question->getMaximumPoints(), "worked_through" => $worked_through, "postponed" => $is_postponed, "sequence" => $qId, "obligatory" => ilObjTest::isQuestionObligatory($question->getId()), 'isAnswered' => $question->isAnswered($this->getActiveId(), $this->getPass()));

                                if(!$obligationsFilterEnabled || $row['obligatory'])
                                {
                                        $summary[] = $row;
                                }

                                $key++;
                        }
                }

                return $summary;
        }

        public function hasFilteredQuestionListCheckedQuestions()
        {
                $filteredQuestions = $this->questionSet->getFilteredQuestionList()->getQuestionDataArray();
                
                foreach($filteredQuestions as $filteredQuestion)
                {
                        if( $this->isQuestionChecked($filteredQuestion['question_id']) )
                        {
                                return true;
                        }
                }
                
                return false;
        }
        
        public function resetFilteredQuestionListsCheckedStatus()
        {
                $filteredQuestions = $this->questionSet->getFilteredQuestionList()->getQuestionDataArray();

                foreach($filteredQuestions as $filteredQuestion)
                {
                        if( $this->isQuestionChecked($filteredQuestion['question_id']) )
                        {
                                $this->setQuestionUnchecked($filteredQuestion['question_id']);
                        }
                }
        }
}