Add Item#ancestors

app/helpers/admin_helper.rb

@@ -0,0 +1,8 @@
+module AdminHelper
+  
+  def show_parent_items_link(parent_item)  
+    @parent_items = @parent_item.ancestors.map{ |i| i.name }
+    ( @parent_items.map{ |i| link_to(i, admin_items_path(:parent_name=>i) ) } << parent_item.name ).join("/")
+  end
+  
+end