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MDL-47430 core_grades: Handle negative grademin with natural weighting

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Part of: MDL-46576
This commit is contained in:
Frederic Massart 2014-09-26 17:32:08 +08:00 committed by Adrian Greeve
parent 11c93e286b
commit 0b2e8ae07b
2 changed files with 34 additions and 8 deletions
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11
grade/report/user/lib.php
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@ -706,8 +706,15 @@ class grade_report_user extends grade_report {
if (isset($this->aggregationhints[$itemid])) {
// Normalise the gradeval.
$graderange = $this->aggregationhints[$itemid]['grademax'] - $this->aggregationhints[$itemid]['grademin'];
$gradeval = ($this->aggregationhints[$itemid]['grade'] - $this->aggregationhints[$itemid]['grademin']) / $graderange;
$gradecat = $grade_object->load_parent_category();
if ($gradecat->aggregation == GRADE_AGGREGATE_SUM) {
// Natural aggregation/Sum of grades does not consider the mingrade.
$graderange = $this->aggregationhints[$itemid]['grademax'];
$gradeval = $this->aggregationhints[$itemid]['grade'] / $graderange;
} else {
$graderange = $this->aggregationhints[$itemid]['grademax'] - $this->aggregationhints[$itemid]['grademin'];
$gradeval = ($this->aggregationhints[$itemid]['grade'] - $this->aggregationhints[$itemid]['grademin']) / $graderange;
}
// Multiply the normalised value by the weight
// of all the categories higher in the tree.

31
lib/grade/grade_category.php
View File

@ -661,7 +661,13 @@ class grade_category extends grade_object {
if (isset($grademaxoverrides[$itemid])) {
$usergrademax = $grademaxoverrides[$itemid];
}
$grade_values[$itemid] = grade_grade::standardise_score($v, $usergrademin, $usergrademax, 0, 1);
if ($this->aggregation == GRADE_AGGREGATE_SUM) {
// Assume that the grademin is 0 when standardising the score, to preserve negative grades.
$grade_values[$itemid] = grade_grade::standardise_score($v, 0, $usergrademax, 0, 1);
} else {
$grade_values[$itemid] = grade_grade::standardise_score($v, $usergrademin, $usergrademax, 0, 1);
}
}
// For items with no value, and not excluded - either set their grade to 0 or exclude them.
@ -715,16 +721,29 @@ class grade_category extends grade_object {
$grademaxoverrides);
$agg_grade = $result['grade'];
// Set the actual grademin and max to bind the grade properly.
$this->grade_item->grademin = $result['grademin'];
$this->grade_item->grademax = $result['grademax'];
if ($this->aggregation == GRADE_AGGREGATE_SUM) {
// The natural aggregation always displays the range as coming from 0 for categories.
// However, when we bind the grade we allow for negative values.
$result['grademin'] = 0;
}
// Recalculate the grade back to requested range.
$finalgrade = grade_grade::standardise_score($agg_grade, 0, 1, $result['grademin'], $result['grademax']);
$grade->finalgrade = $this->grade_item->bounded_grade($finalgrade);
$oldrawgrademin = $grade->rawgrademin;
$oldrawgrademax = $grade->rawgrademax;
$grade->rawgrademin = $result['grademin'];
$grade->rawgrademax = $result['grademax'];
// update in db if changed
// Update in db if changed.
if (grade_floats_different($grade->finalgrade, $oldfinalgrade) ||
grade_floats_different($grade->rawgrademax, $oldrawgrademax)) {
grade_floats_different($grade->rawgrademax, $oldrawgrademax) ||
grade_floats_different($grade->rawgrademin, $oldrawgrademin)) {
$grade->update('aggregation');
}
@ -1046,11 +1065,11 @@ class grade_category extends grade_object {
if (isset($grademaxoverrides[$itemid])) {
$usergrademax = $grademaxoverrides[$itemid];
}
$gradeitemrange = $usergrademax - $usergrademin;
// Ignore extra credit and items with a weight of 0.
if ($items[$itemid]->aggregationcoef <= 0 && $items[$itemid]->aggregationcoef2 > 0) {
$grademax += $gradeitemrange;
$grademin += $usergrademin;
$grademax += $usergrademax;
$sumweights += $items[$itemid]->aggregationcoef2;
}
}