balance promotion settings

app/models/order_detail.rb

@@ -10,7 +10,7 @@ class OrderDetail < ActiveRecord::Base
   def order_validation
     if self.product_id > 0
       prd = Product.where("id = ?", self.product_id).first
-      if prd1.blank?
+      if prd.blank?
         self.errors.add(:product_id,"商品不存在，请重新填写商品ID")
       else
         self.product_name=prd.Name