From 72a0975fd2cd85ec791866e4fdbdb3ba4c432937 Mon Sep 17 00:00:00 2001
From: pichetp <pichetp>
Date: Thu, 4 Dec 2008 16:32:16 +0000
Subject: [PATCH] MDL-17524 Merging from HEAD Deleting a calculated question
 delete datasetdefinitions shared by other question

---
 question/type/calculated/questiontype.php | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/question/type/calculated/questiontype.php b/question/type/calculated/questiontype.php
index ee567e58634..529ad620dba 100644
--- a/question/type/calculated/questiontype.php
+++ b/question/type/calculated/questiontype.php
@@ -344,8 +344,13 @@ class question_calculated_qtype extends question_dataset_dependent_questiontype
         delete_records("question_numerical_units", "question", $questionid);
         if ($datasets = get_records('question_datasets', 'question', $questionid)) {
             foreach ($datasets as $dataset) {
-                delete_records('question_dataset_definitions', 'id', $dataset->datasetdefinition);
-                delete_records('question_dataset_items', 'definition', $dataset->datasetdefinition);
+                if (! get_records_select(
+                        'question_datasets',
+                        "question != $questionid
+                        AND datasetdefinition = $dataset->datasetdefinition;")){                                 
+                    delete_records('question_dataset_definitions', 'id', $dataset->datasetdefinition);
+                    delete_records('question_dataset_items', 'definition', $dataset->datasetdefinition);
+                }
             }
         }
         delete_records("question_datasets", "question", $questionid);