From ea07b2d62201c0940bb14468c4720f010d35e969 Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Fri, 31 May 2013 20:47:26 +0100
Subject: [PATCH] MDL-39978 Essays with files break each attempt builds on last

---
 question/engine/datalib.php | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/question/engine/datalib.php b/question/engine/datalib.php
index cfd0af2bc7f..9c0c7cfa622 100644
--- a/question/engine/datalib.php
+++ b/question/engine/datalib.php
@@ -152,6 +152,8 @@ class question_engine_data_mapper {
         foreach ($step->get_all_data() as $name => $value) {
             if ($value instanceof question_file_saver) {
                 $value->save_files($stepid, $context);
+            }
+            if ($value instanceof question_response_files) {
                 $value = (string) $value;
             }