From a2f1f65db48eb990aed11823f9c7e7a2866b5fb8 Mon Sep 17 00:00:00 2001
From: Andrew Davis <andrew@moodle.com>
Date: Fri, 29 Aug 2014 10:36:01 +0800
Subject: [PATCH] MDL-47011 core_grade: added naive natural weight calculation
 to gradebook

---
 lib/grade/grade_category.php | 43 ++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/lib/grade/grade_category.php b/lib/grade/grade_category.php
index 143d3aef878..a7f8caea339 100644
--- a/lib/grade/grade_category.php
+++ b/lib/grade/grade_category.php
@@ -461,6 +461,9 @@ class grade_category extends grade_object {
         // needed mostly for SUM agg type
         $this->auto_update_max($items);
 
+        // Needed for Natural aggregation type.
+        $this->auto_update_weights();
+
         $grade_inst = new grade_grade();
         $fields = 'g.'.implode(',g.', $grade_inst->required_fields);
 
@@ -1026,6 +1029,46 @@ class grade_category extends grade_object {
         }
     }
 
+    /**
+     * Recalculate the weights of the grade items in this category.
+     * THIS DOES NOT TAKE INTO ACCOUNT HIDDEN ACTIVITIES, GROUPS.
+     */
+    private function auto_update_weights() {
+        if ($this->aggregation != GRADE_AGGREGATE_SUM) {
+            // This is only required if we are using natural weights.
+            return;
+        }
+        $children = $this->get_children();
+
+        $grade_item = null;
+
+        // Calculate the sum of the grademax's of all the items within this category.
+        $totalgrademax = 0;
+        foreach ($children as $sortorder => $child) {
+            $grade_item = null;
+
+            if ($child['type'] == 'item') {
+                $grade_item = $child['object'];
+            } else if ($child['type'] == 'category') {
+                $grade_item = $child['object']->load_grade_item();
+            }
+            $totalgrademax += $grade_item->grademax;
+        }
+
+        reset($children);
+        foreach ($children as $sortorder => $child) {
+            $grade_item = null;
+
+            if ($child['type'] == 'item') {
+                $grade_item = $child['object'];
+            } else if ($child['type'] == 'category') {
+                $grade_item = $child['object']->load_grade_item();
+            }
+            $grade_item->aggregationcoef2 = $grade_item->grademax/$totalgrademax;
+            $grade_item->update();
+        }
+    }
+
     /**
      * Internal function for category grades summing
      *