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MDL-28021 Completion system can create inconsistent database rows

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This change includes:

(1) update deletes older versions of inconsistent rows
(2) update drops one index and replaces it with a new unique index
(3) fixed to ensure that when it decides whether to insert or update
    it uses current database state and not cached info
(4) unit tests updated to test #3
This commit is contained in:
sam marshall
2011-06-27 15:26:54 +02:00
committed by Eloy Lafuente (stronk7)
parent 7cb1a84978
commit f114cff65f
5 changed files with 96 additions and 18 deletions
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lib/completionlib.php
+11 -4
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@@ -935,13 +935,20 @@ class completion_info {
function internal_set_data($cm, $data) {
global $USER, $SESSION, $DB;
if ($data->id) {
// Has real (nonzero) id meaning that a database row exists
$DB->update_record('course_modules_completion', $data);
} else {
$transaction = $DB->start_delegated_transaction();
if (!$data->id) {
// Check there isn't really a row
$data->id = $DB->get_field('course_modules_completion', 'id',
array('coursemoduleid'=>$data->coursemoduleid, 'userid'=>$data->userid));
}
if (!$data->id) {
// Didn't exist before, needs creating
$data->id = $DB->insert_record('course_modules_completion', $data);
} else {
// Has real (nonzero) id meaning that a database row exists, update
$DB->update_record('course_modules_completion', $data);
}
$transaction->allow_commit();
if ($data->userid == $USER->id) {
$SESSION->completioncache[$cm->course][$cm->id] = $data;