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MDL-48634 grades: Add an option to rescale when changing the maxgrade

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Damyon Wiese 2015-04-15 07:57:28 -04:00 • committed by Mark Nelson
parent 9d5d9c64ff
commit d629c601c5
12 changed files with 422 additions and 11 deletions
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46
mod/assign/lib.php
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@ -1315,6 +1315,52 @@ function assign_user_complete($course, $user, $coursemodule, $assign) {
echo $assignment->view_student_summary($user, false);
}
/**
* Rescale all grades for this activity and push the new grades to the gradebook.
*
* @param stdClass $course Course db record
* @param stdClass $cm Course module db record
* @param float $oldmin
* @param float $oldmax
* @param float $newmin
* @param float $newmax
*/
function assign_rescale_activity_grades($course, $cm, $oldmin, $oldmax, $newmin, $newmax) {
global $DB;
if ($oldmax <= $oldmin) {
// Grades cannot be scaled.
return false;
}
$scale = ($newmax - $newmin) / ($oldmax - $oldmin);
if (($newmax - $newmin) <= 1) {
// We would lose too much precision, lets bail.
return false;
}
$params = array(
'p1' => $oldmin,
'p2' => $scale,
'p3' => $newmin,
'a' => $cm->instance
);
$sql = 'UPDATE {assign_grades} set grade = (((grade - :p1) * :p2) + :p3) where assignment = :a';
$dbupdate = $DB->execute($sql, $params);
if (!$dbupdate) {
return false;
}
// Now re-push all grades to the gradebook.
$dbparams = array('id' => $cm->instance);
$assign = $DB->get_record('assign', $dbparams);
$assign->cmidnumber = $cm->idnumber;
assign_update_grades($assign);
return true;
}
/**
* Print the grade information for the assignment for this user.
*