admin/oacleanup.php

   1 <?php
   2
   3 if (!isset($CFG)) {
   4
   5     require('../config.php');
   6     require_once($CFG->libdir.'/adminlib.php');
   7
   8     admin_externalpage_setup('oacleanup');
   9
  10     echo $OUTPUT->header();
  11     online_assignment_cleanup(true);
  12     echo $OUTPUT->footer();
  13
  14 }
  15
  16
  17
  18 function online_assignment_cleanup($output=false) {
  19     global $CFG, $DB, $OUTPUT;
  20
  21     if ($output) {
  22         echo $OUTPUT->heading('Online Assignment Cleanup');
  23         echo '<center>';
  24     }
  25
  26
  27     /// We don't want to run this code if we are doing an upgrade from an assignment
  28     /// version earlier than 2005041400
  29     /// because the assignment type field will not exist
  30     $amv = $DB->get_field('modules', 'version', array('name'=>'assignment'));
  31     if ((int)$amv < 2005041400) {
  32         if ($output) {
  33             echo '</center>';
  34         }
  35         return;
  36     }
  37
  38
  39     /// get the module id for assignments from db
  40     $arecord = $DB->get_record('modules', array('name', 'assignment'));
  41     $aid = $arecord->id;
  42
  43
  44     /// get a list of all courses on this site
  45     list($ctxselect, $ctxjoin) = context_instance_preload_sql('c.id', CONTEXT_COURSE, 'ctx');
  46     $sql = "SELECT c.* $ctxselect FROM {course} c $ctxjoin";
  47     $courses = $DB->get_records_sql($sql);
  48
  49     /// cycle through each course
  50     foreach ($courses as $course) {
  51         context_instance_preload($course);
  52         $context = get_context_instance(CONTEXT_COURSE, $course->id);
  53
  54         if (empty($course->fullname)) {
  55             $fullname = get_string('course').': '.$course->id;
  56         } else {
  57             $fullname = format_string($course->fullname, true, array('context' => $context));
  58         }
  59         if ($output) echo $OUTPUT->heading($fullname);
  60
  61         /// retrieve a list of sections beyond what is currently being shown
  62         $sql = "SELECT *
  63                   FROM {course_sections}
  64                  WHERE course=? AND section>?
  65               ORDER BY section ASC";
  66         $params = array($course->id, $course->numsections);
  67         if (!($xsections = $DB->get_records_sql($sql, $params))) {
  68             if ($output) echo 'No extra sections<br />';
  69             continue;
  70         }
  71
  72         /// cycle through each of the xtra sections
  73         foreach ($xsections as $xsection) {
  74
  75             if ($output) echo 'Checking Section: '.$xsection->section.'<br />';
  76
  77             /// grab any module instances from the sequence field
  78             if (!empty($xsection->sequence)) {
  79                 $instances = explode(',', $xsection->sequence);
  80
  81                 /// cycle through the instances
  82                 foreach ($instances as $instance) {
  83                     /// is this an instance of an online assignment
  84                     $sql = "SELECT a.id
  85                               FROM  {course_modules} cm, {assignment} a
  86                              WHERE cm.id = ? AND cm.module = ? AND
  87                                    cm.instance = a.id AND a.assignmenttype = 'online'";
  88                     $params = array($instance, $aid);
  89
  90                     /// if record exists then we need to move instance to it's correct section
  91                     if ($DB->record_exists_sql($sql, $params)) {
  92
  93                         /// check the new section id
  94                         /// the journal update erroneously stored it in course_sections->section
  95                         $newsection = $xsection->section;
  96                         /// double check the new section
  97                         if ($newsection > $course->numsections) {
  98                             /// get the record for section 0 for this course
  99                             if (!($zerosection = $DB->get_record('course_sections', array('course'=>$course->id, 'section'=>'0')))) {
 100                                 continue;
 101                             }
 102                             $newsection = $zerosection->id;
 103                         }
 104
 105                         /// grab the section record
 106                         if (!($section = $DB->get_record('course_sections', array('id'=>$newsection)))) {
 107                             if ($output) {
 108                                 echo 'Serious error: Cannot retrieve section: '.$newsection.' for course: '. $fullname .'<br />';
 109                             }
 110                             continue;
 111                         }
 112
 113                         /// explode the sequence
 114                         if  (($sequence = explode(',', $section->sequence)) === false) {
 115                             $sequence = array();
 116                         }
 117
 118                         /// add instance to correct section
 119                         array_push($sequence, $instance);
 120
 121                         /// implode the sequence
 122                         $section->sequence = implode(',', $sequence);
 123
 124                         $DB->set_field('course_sections', 'sequence', $section->sequence, array('id'=>$section->id));
 125
 126                         /// now we need to remove the instance from the old sequence
 127
 128                         /// grab the old section record
 129                         if (!($section = $DB->get_record('course_sections', array('id'=>$xsection->id)))) {
 130                             if ($output) echo 'Serious error: Cannot retrieve old section: '.$xsection->id.' for course: '.$fullname.'<br />';
 131                             continue;
 132                         }
 133
 134                         /// explode the sequence
 135                         if  (($sequence = explode(',', $section->sequence)) === false) {
 136                             $sequence = array();
 137                         }
 138
 139                         /// remove the old value from the array
 140                         $key = array_search($instance, $sequence);
 141                         unset($sequence[$key]);
 142
 143                         /// implode the sequence
 144                         $section->sequence = implode(',', $sequence);
 145
 146                         $DB->set_field('course_sections', 'sequence', $section->sequence, array('id'=>$section->id));
 147
 148
 149                         if ($output) echo 'Online Assignment (instance '.$instance.') moved from section '.$section->id.': to section '.$newsection.'<br />';
 150
 151                     }
 152                 }
 153             }
 154
 155             /// if the summary and sequence are empty then remove this section
 156             if (empty($xsection->summary) and empty($xsection->sequence)) {
 157                 $DB->delete_records('course_sections', array('id'=>$xsection->id));
 158                 if ($output) echo 'Deleting empty section '.$xsection->section.'<br />';
 159             }
 160         }
 161     }
 162
 163     echo '</center>';
 164 }
 165
 166