balance promotion settings

app/models/order_detail.rb

@@ -22,7 +22,7 @@ class OrderDetail < ActiveRecord::Base
       if ord.blank?
         self.errors.add(:order_id,"订单不存在，请重新填写编号")
       else
-        self.order_id=order.id
+        self.order_id=ord.id
       end
     end