From 0d8b6288136b048fd2ae7520492fa9d2f3063012 Mon Sep 17 00:00:00 2001
From: skodak <skodak>
Date: Tue, 21 Aug 2007 09:23:37 +0000
Subject: [PATCH] MDL-10056 Fixed deleting of assignments when original plugin
 not present; backported from HEAD

---
 mod/assignment/lib.php | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/mod/assignment/lib.php b/mod/assignment/lib.php
index bd133543aa1..f79acb592c2 100644
--- a/mod/assignment/lib.php
+++ b/mod/assignment/lib.php
@@ -1679,8 +1679,17 @@ function assignment_delete_instance($id){
         return false;
     }
 
-    require_once("$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php");
-    $assignmentclass = "assignment_$assignment->assignmenttype";
+    // fall back to base class if plugin missing
+    $classfile = "$CFG->dirroot/mod/assignment/type/$assignment->assignmenttype/assignment.class.php";
+    if (file_exists($classfile)) {
+        require_once($classfile);
+        $assignmentclass = "assignment_$assignment->assignmenttype";
+
+    } else {
+        debugging("Missing assignment plug-in: {$assignment->assignmenttype}. Using base class for deleting instead.");
+        $assignmentclass = "assignment_base";
+    }
+
     $ass = new $assignmentclass();
     return $ass->delete_instance($assignment);
 }