cookies记录用户浏览商品

http://www.schooltop.net/blogs/292

before_filter :browse_product_history #浏览历史记录
 
 # 存
 # 调用cookies[:browse_product_history]返回chemical的历史浏览序列（从新到旧）,用/隔开,
 def browse_product_history
   cookies.delete :browse_chemicals_history if cookies[:browse_product_history] =~ /EBD/
   if params[:controller] == "products" && params[:action] == "show"
     product_id = params[:id]
     if cookies[:browse_product_history].blank?
       history = product_id + "/"
       cookies[:browse_product_history] = { value: history, expires: 20.years.from_now }
     else
       history_array = cookies[:browse_product_history].split("/")
       if history_array.size < 6
         if history_array.include?(product_id)
           history_array.delete(product_id)
           history_array.unshift(product_id)
         else
           history_array.unshift(product_id)
         end
       else
         if history_array.include?(product_id)
           history_array.delete(product_id)
           history_array.unshift(product_id)
         else
           history_array.pop
           history_array.unshift(product_id)
         end
       end
       history = history_array * "/"
       cookies[:browse_product_history] = { value: history, expires: 20.years.from_now }
     end
   end
 end
 
 
 
取：
@history_browse_product_cases = cookies[:browse_product_history].split("/")
@product = Product.where(id: @history_browse_product_cases)