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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  /**
  18   * This file contains datbase upgrade code that is called from lib/db/upgrade.php,
  19   * and also check methods that can be used for pre-install checks via
  20   * admin/environment.php and lib/environmentlib.php.
  21   *
  22   * @package    moodlecore
  23   * @subpackage questionbank
  24   * @copyright  2007 The Open University
  25   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  26   */
  27  
  28  
  29  defined('MOODLE_INTERNAL') || die();
  30  
  31  
  32  /**
  33   * In Moodle, all random questions should have question.parent set to be the same
  34   * as question.id. One effect of MDL-5482 is that this will not be true for questions that
  35   * were backed up then restored. The probably does not cause many problems, except occasionally,
  36   * if the bogus question.parent happens to point to a multianswer question type, or when you
  37   * try to do a subsequent backup. Anyway, these question.parent values should be fixed, and
  38   * that is what this update does.
  39   */
  40  function question_fix_random_question_parents() {
  41      global $CFG, $DB;
  42      $DB->execute("UPDATE {question} SET parent = id WHERE qtype = 'random' AND parent <> id");
  43  
  44      return true;
  45  }