From f96e83d4b6db97c49f812cde8f677550f7949e65 Mon Sep 17 00:00:00 2001
From: pichetp <pichetp>
Date: Tue, 18 Nov 2008 18:28:20 +0000
Subject: [PATCH] MDL-17228 Synchronizing dataitems between calculated
 questions in a quiz

---
 question/type/calculated/questiontype.php | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/question/type/calculated/questiontype.php b/question/type/calculated/questiontype.php
index 60b627e902..5c330b9ff6 100644
--- a/question/type/calculated/questiontype.php
+++ b/question/type/calculated/questiontype.php
@@ -321,7 +321,20 @@ class question_calculated_qtype extends default_questiontype {
         }
 
         // Choose a random dataset
-        $state->options->datasetitem = rand(1, $maxnumber);
+        if (!isset($cmoptions->intro) || strstr($cmoptions->intro, 'synchronize_calculated') === false ) {
+            $state->options->datasetitem = rand(1, $maxnumber);
+        }else{
+            if( !isset($cmoptions->synchronize_calculated)) {
+               $state->options->datasetitem = rand(1, $maxnumber);
+               $cmoptions->synchronize_calculated = $state->options->datasetitem ;
+            }else {
+                if ($cmoptions->synchronize_calculated <= $maxnumber){
+                    $state->options->datasetitem = $cmoptions->synchronize_calculated ;
+                }else {
+                    $state->options->datasetitem = rand(1, $maxnumber);
+                }
+            }
+        };  
         $state->options->dataset =
          $this->pick_question_dataset($question,$state->options->datasetitem);
         $state->responses = array('' => '');
-- 
2.39.5