增加复制商品功能

app/models/product.rb

@@ -30,7 +30,7 @@ class Product < ActiveRecord::Base
         pictures = ProductPicture.find_by_sql("select * from product_pictures where pic_type=0 and product_id = #{self.id}")
         # 创建商品图片
         pictures.each do |u|
-            u.remove
+            u.delete
         end
     end