From 613aff5053df60b189fa4fa2e9c6f7c16e15e24d Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Wed, 4 Aug 2010 17:54:55 +0000
Subject: [PATCH] qtype_truefalse MDL-22658 questions get marked as answered
 even when an answer has not been selected.

---
 question/type/truefalse/questiontype.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/question/type/truefalse/questiontype.php b/question/type/truefalse/questiontype.php
index 87ae461e071..9c2b895e0c0 100644
--- a/question/type/truefalse/questiontype.php
+++ b/question/type/truefalse/questiontype.php
@@ -110,6 +110,17 @@ class question_truefalse_qtype extends default_questiontype {
         return true;
     }
 
+    function compare_responses($question, $state, $teststate) {
+        if (isset($state->responses['']) && isset($teststate->responses[''])) {
+            return $state->responses[''] === $teststate->responses[''];
+        } else if (isset($teststate->responses['']) && $teststate->responses[''] === '' &&
+                !isset($state->responses[''])) {
+            // Nothing selected in the past, and nothing selected now.
+            return true;
+        }
+        return false;
+    }
+
     function get_correct_responses(&$question, &$state) {
         // The correct answer is the one which gives full marks
         foreach ($question->options->answers as $answer) {