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  1. Moodle
  2. MDL-45970

Edit quiz page corrupts the question variable when displaying random questions

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.6.3, 2.7, 2.8
    • Fix Version/s: 2.6.4, 2.7.1
    • Component/s: Quiz
    • Labels:
    • Affected Branches:
      MOODLE_26_STABLE, MOODLE_27_STABLE, MOODLE_28_STABLE
    • Fixed Branches:
      MOODLE_26_STABLE, MOODLE_27_STABLE
    • Pull from Repository:
    • Pull Master Branch:
    • Pull Master Diff URL:
    • Testing Instructions:
      Hide

      (In what follows, the question type does not matter. True/false chosen because it is quickest to create. You only need to type name and question text.)

      1. Create a new quiz called 'MDL-45970 quiz'.
      2. Go to the 'Edit quiz' page. (Make sure you are on the 'Edit quiz' tab, not 'Order and paging'.)
      3. Click 'Add random qusestion...' and choose Random question using a new category, Name: 'Variants of question 1', then submit.
      4. Click 'Add a question...' and create a true-false question, setting the category for that question to 'Default for MDL-45970 quiz', then Save.
      5. Click the down-arrow beside question 2, so it moves onto a new page.
      6. Verify that no notices were shown.

      Before this fix, these steps lead to

      Notice: Undefined property: stdClass::$slot in /home/rajesht/moodles/t/moodle/mod/quiz/editlib.php on line 702

      Show
      (In what follows, the question type does not matter. True/false chosen because it is quickest to create. You only need to type name and question text.) Create a new quiz called ' MDL-45970 quiz'. Go to the 'Edit quiz' page. (Make sure you are on the 'Edit quiz' tab, not 'Order and paging'.) Click 'Add random qusestion...' and choose Random question using a new category, Name: 'Variants of question 1', then submit. Click 'Add a question...' and create a true-false question, setting the category for that question to 'Default for MDL-45970 quiz', then Save. Click the down-arrow beside question 2, so it moves onto a new page. Verify that no notices were shown. Before this fix, these steps lead to Notice: Undefined property: stdClass::$slot in /home/rajesht/moodles/t/moodle/mod/quiz/editlib.php on line 702

      Description

      (11:12:16 AM) Rajesh Taneja: +++ b/mod/quiz/editlib.php
      		 
      @@ -882,8 +882,8 @@ function quiz_print_randomquestion(&$question, &$pageurl, &$quiz, $quiz_qbanktoo
      		 
       
               // Then list them.
      		 
               echo '<ul>';
      		 
      -        foreach ($questionstoshow as $question) {
      		 
      -            echo '<li>' . quiz_question_tostring($question, true) . '</li>';
      		 
      +        foreach ($questionstoshow as $question1) {
      		 
      +            echo '<li>' . quiz_question_tostring($question1, true) . '</li>';
      		 
               }
      		 
      (11:12:40 AM) Rajesh Taneja: This was updating reference and causing the problem...

      Note that the loop changes $question, which is passed into the function by reference.

        Attachments

          Issue Links

          has a non-specific relationship to

          Bug - A problem which impairs or prevents Moodle from functioning correctly. MDL-45611 Question text overlaps other parts of the UI on the edit quiz page.

          • Minor - Minor loss of function where workaround is possible
          • Closed
          is a regression caused by

          Improvement - An enhancement to an existing Moodle feature. MDL-43749 Unpick quiz.questions DB column

          • Blocker - Blocks development and/or testing, prevents Moodle from running (applicable to bugs only)
          • Closed
          Testing discovered

          Bug - A problem which impairs or prevents Moodle from functioning correctly. MDL-45763 Quiz doesn't reuse random questions (but tries to)

          • Minor - Minor loss of function where workaround is possible
          • Closed

            Activity

              People

              Assignee:
              timhunt Tim Hunt
              Reporter:
              timhunt Tim Hunt
              Peer reviewer:
              Eric Merrill Eric Merrill
              Integrator:
              Eloy Lafuente (stronk7) Eloy Lafuente (stronk7)
              Tester:
              John Okely John Okely
              Participants:
              Component watchers:
              Tim Hunt, Andrew Lyons, Dongsheng Cai, Huong Nguyen, Jun Pataleta, Michael Hawkins, Shamim Rezaie, Simey Lameze
              Votes:
              0 Vote for this issue
              Watchers:
              2 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:
                Fix Release Date:
                14/Jul/14