From 5e876cd379e2d2055aea32d16f7e13bfa94c3577 Mon Sep 17 00:00:00 2001
From: Gerwood Stewart <gerwood@gmail.com>
Date: Mon, 16 May 2011 11:57:33 +1000
Subject: [PATCH] MDL-27521 Updates the can_finalize and can_unfinalize methods
 to deal with passing a submission object that isn't one (in this case is a
 Boolean value). This will result in both methods now returning false. Kick on
 effect is that it corrects the bug described in MDL-27521 by removing the
 button if it isn't possible to finalize the submission.

---
 mod/assignment/type/upload/assignment.class.php | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mod/assignment/type/upload/assignment.class.php b/mod/assignment/type/upload/assignment.class.php
index a7115700cc4..cb340a5a978 100644
--- a/mod/assignment/type/upload/assignment.class.php
+++ b/mod/assignment/type/upload/assignment.class.php
@@ -918,9 +918,14 @@ class assignment_upload extends assignment_base {
     }
 
     function can_unfinalize($submission) {
+        if(is_bool($submission)) {
+            return false;
+        }
+
         if (!$this->drafts_tracked()) {
             return false;
         }
+
         if (has_capability('mod/assignment:grade', $this->context)
           and $this->isopen()
           and $this->is_finalized($submission)) {
@@ -932,6 +937,11 @@ class assignment_upload extends assignment_base {
 
     function can_finalize($submission) {
         global $USER;
+
+        if(is_bool($submission)) {
+            return false;
+        }
+
         if (!$this->drafts_tracked()) {
             return false;
         }