From 488366bed8374ab32e351da206e8037845565b8f Mon Sep 17 00:00:00 2001
From: David Monllao <davidm@moodle.com>
Date: Tue, 1 Mar 2016 16:17:56 +0800
Subject: [PATCH] MDL-53301 grades: Update gradeitems aggregationcoef2 only
 when required

---
 lib/grade/grade_category.php | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/lib/grade/grade_category.php b/lib/grade/grade_category.php
index 672fc08f2f4..ea6c24cd4cf 100644
--- a/lib/grade/grade_category.php
+++ b/lib/grade/grade_category.php
@@ -1596,19 +1596,20 @@ class grade_category extends grade_object {
             } else if (empty($CFG->grade_includescalesinaggregation) && $gradeitem->gradetype == GRADE_TYPE_SCALE) {
                 // We will not aggregate the scales, so we can ignore upating their weights.
                 continue;
-            }
-
-            if (!$oldextracreditcalculation && $gradeitem->aggregationcoef > 0) {
-                // For an item with extra credit ignore other weigths and overrides.
-                // Do not change anything at all if it's weight was already overridden.
-                if (!$gradeitem->weightoverride) {
-                    $gradeitem->aggregationcoef2 = $totalgrademax ? ($gradeitem->grademax / $totalgrademax) : 0;
-                    $gradeitem->update();
-                }
+            } else if (!$oldextracreditcalculation && $gradeitem->aggregationcoef > 0 && $gradeitem->weightoverride) {
+                // For an item with extra credit ignore other weigths and overrides but do not change anything at all
+                // if it's weight was already overridden.
                 continue;
             }
 
-            if (!$gradeitem->weightoverride) {
+            // Store the previous value here, no need to update if it is the same value.
+            $prevaggregationcoef2 = $gradeitem->aggregationcoef2;
+
+            if (!$oldextracreditcalculation && $gradeitem->aggregationcoef > 0 && !$gradeitem->weightoverride) {
+                // For an item with extra credit ignore other weigths and overrides.
+                $gradeitem->aggregationcoef2 = $totalgrademax ? ($gradeitem->grademax / $totalgrademax) : 0;
+
+            } else if (!$gradeitem->weightoverride) {
                 // Calculations with a grade maximum of zero will cause problems. Just set the weight to zero.
                 if ($totaloverriddenweight >= 1 || $totalnonoverriddengrademax == 0 || $gradeitem->grademax == 0) {
                     // There is no more weight to distribute.
@@ -1619,7 +1620,7 @@ class grade_category extends grade_object {
                     $gradeitem->aggregationcoef2 = ($gradeitem->grademax/$totalnonoverriddengrademax) *
                             (1 - $totaloverriddenweight);
                 }
-                $gradeitem->update();
+
             } else if ((!$automaticgradeitemspresent && $normalisetotal != 1) || ($requiresnormalising)
                     || $overridearray[$gradeitem->id]['weight'] < 0) {
                 // Just divide the overriden weight for this item against the total weight override of all
@@ -1631,6 +1632,9 @@ class grade_category extends grade_object {
                 } else {
                     $gradeitem->aggregationcoef2 = $overridearray[$gradeitem->id]['weight'] / $normalisetotal;
                 }
+            }
+
+            if (grade_floatval($prevaggregationcoef2) !== grade_floatval($gradeitem->aggregationcoef2)) {
                 // Update the grade item to reflect these changes.
                 $gradeitem->update();
             }