Follow on to 966dee8628293f78fbf9431281709ceba011d3c2 for #1586 --

don't try to update the tag item count if we didn't change any items
with this change (ie: a tag rename).  In that case, we haven't loaded
the related items so we don't have any idea what the count is going to
be.

1 files changed, 7 insertions, 5 deletions

diff --git a/modules/tag/models/tag.php b/modules/tag/models/tag.php
index 25df87e0..2b73b5be 100644
--- a/modules/tag/models/tag.php
+++ b/modules/tag/models/tag.php
@@ -78,12 +78,14 @@ class Tag_Model_Core extends ORM {
       $related_item_ids[$row->item_id] = 1;
     }
 
-    $added = array_diff($this->changed_relations["items"], $this->object_relations["items"]);
-    $removed = array_diff($this->object_relations["items"], $this->changed_relations["items"]);
-    if (isset($this->changed_relations["items"])) {
-      $changed = array_merge($added, $removed);
+    if (isset($this->object_relations["items"])) {
+      $added = array_diff($this->changed_relations["items"], $this->object_relations["items"]);
+      $removed = array_diff($this->object_relations["items"], $this->changed_relations["items"]);
+      if (isset($this->changed_relations["items"])) {
+        $changed = array_merge($added, $removed);
+      }
+      $this->count = count($this->object_relations["items"]) + count($added) - count($removed);
     }
-    $this->count = count($this->object_relations["items"]) + count($added) - count($removed);
 
     $result = parent::save();