From a468b690132224b89bcbdf037e3b4a35a217e566 Mon Sep 17 00:00:00 2001
From: iCross <rja@icross.cc>
Date: Thu, 6 Jun 2013 23:10:42 +0800
Subject: [PATCH] archive module: fix old data caused error

---
 app/models/mongoid/sortable.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/mongoid/sortable.rb b/app/models/mongoid/sortable.rb
index 16a69defb..b22dce08a 100644
--- a/app/models/mongoid/sortable.rb
+++ b/app/models/mongoid/sortable.rb
@@ -23,7 +23,7 @@ module Mongoid
     def set_sort_number
       if self.new? && self.sort_number.nil?
         last_record = self.class.desc(:sort_number).first
-        if last_record
+        if last_record.sort_number
           self.sort_number = (last_record.sort_number + 10) / 10 * 10
         else
           self.sort_number = 10