From b51f6864c1d700a1458679ed7c602b36ee147057 Mon Sep 17 00:00:00 2001
From: Daniel Thee Roperto <danielroperto@catalyst-au.net>
Date: Thu, 5 Jan 2017 15:31:31 +1100
Subject: [PATCH] MDL-57576 assignment: Overwrite feedback file if it has the
 same name.

---
 mod/assign/feedback/file/locallib.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/mod/assign/feedback/file/locallib.php b/mod/assign/feedback/file/locallib.php
index d5c3973346d..e0afc11f136 100644
--- a/mod/assign/feedback/file/locallib.php
+++ b/mod/assign/feedback/file/locallib.php
@@ -179,6 +179,20 @@ class assign_feedback_file extends assign_feedback_plugin {
                     // automatically with current timestamp.
                     continue;
                 }
+
+                $existingfile = $fs->get_file(
+                    $newfilerecord->contextid,
+                    $newfilerecord->component,
+                    $newfilerecord->filearea,
+                    $newfilerecord->itemid,
+                    $file->get_filepath(),
+                    $file->get_filename()
+                );
+                if ($existingfile) {
+                    // If the file already exists, remove it so it can be updated.
+                    $existingfile->delete();
+                }
+
                 $newfile = $fs->create_file_from_storedfile($newfilerecord, $file);
             }
         }