From 9316d661217ac59f6ed903152c813f88faedbe79 Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Wed, 9 Mar 2011 18:08:18 +0000
Subject: [PATCH] MDL-26714 qtype_multianswer needs an implementation of
 compare_responses.

The main problem lack of this was causing is if you click through a quiz without answering any questions, mulitanswer questions would get marked as answered.
---
 question/type/multianswer/questiontype.php | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/question/type/multianswer/questiontype.php b/question/type/multianswer/questiontype.php
index 012cc4314f0..00d66c92000 100644
--- a/question/type/multianswer/questiontype.php
+++ b/question/type/multianswer/questiontype.php
@@ -599,6 +599,37 @@ class embedded_cloze_qtype extends default_questiontype {
         echo '</div>';
     }
 
+    public function compare_responses($question, $state, $teststate) {
+        global $QTYPES;
+
+        foreach ($question->options->questions as $key => $wrapped) {
+            if (empty($wrapped)) {
+                continue;
+            }
+
+            $stateforquestion = clone($state);
+            if (isset($state->responses[$key])) {
+                $stateforquestion->responses[''] = $state->responses[$key];
+            } else {
+                $stateforquestion->responses[''] = '';
+            }
+
+            $teststateforquestion = clone($teststate);
+            if (isset($teststate->responses[$key])) {
+                $teststateforquestion->responses[''] = $teststate->responses[$key];
+            } else {
+                $teststateforquestion->responses[''] = '';
+            }
+
+            if (!$QTYPES[$wrapped->qtype]->compare_responses($wrapped,
+                    $stateforquestion, $teststateforquestion)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     function grade_responses(&$question, &$state, $cmoptions) {
         global $QTYPES;
         $teststate = clone($state);