From 9d3b86d8357a18ff2847c0fb27ea8974a70895c4 Mon Sep 17 00:00:00 2001
From: Jordan Dukart <jordan@discoverygarden.ca>
Date: Wed, 15 Nov 2017 09:26:56 -0400
Subject: [PATCH] Handle derivatives of itself.

---
 includes/delete_datastream.form.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/includes/delete_datastream.form.inc b/includes/delete_datastream.form.inc
index 9d736982..04ffcda8 100644
--- a/includes/delete_datastream.form.inc
+++ b/includes/delete_datastream.form.inc
@@ -73,7 +73,7 @@ function islandora_datastream_to_purge(AbstractObject $object, $dsid) {
   module_load_include('inc', 'islandora', 'includes/utilities');
   $hooks = islandora_invoke_hook_list(ISLANDORA_DERIVATIVE_CREATION_HOOK, $object->models, array($object));
   $hook_filter = function ($hook_def) use ($dsid) {
-    return isset($hook_def['source_dsid']) && isset($hook_def['destination_dsid']) ?
+    return isset($hook_def['source_dsid']) && isset($hook_def['destination_dsid']) && $hook_def['destination_dsid'] != $dsid ?
       $hook_def['source_dsid'] == $dsid :
       FALSE;
   };