# How to expire cached category browse paginated pages **URL:** \ **Category:** Rails\ **Created:** [February 13, 2008, 7:43am UTC](https://www.ruby-forum.com/t/how-to-expire-cached-category-browse-paginated-pages/128980 "2008-02-13T07:43:08Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![yaxm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/54ee81/32.png) [@yaxm](https://www.ruby-forum.com/u/yaxm)\ **Post date:** [February 13, 2008, 7:43am UTC](https://www.ruby-forum.com/t/how-to-expire-cached-category-browse-paginated-pages/128980/1 "2008-02-13T07:43:08Z")
Hi, I have a set of categories. Each category has a set of products. A user can browse by categories. The product listing by category provides pagination. so I am using rails’ fragment cache to cache results like /category/computers/page/1, /category/computers/page/2 in Memcached: unless read\_fragment({:page =\> params[:page] || 1, :category =\> params[:category]}) so whenever the system updates a product, I need to expire the related category’s product listing pages. But I don’t know which page the product belongs to before it’s updated( say the listing is sorted by product name, and the product name got updated ). so I don’t know which pages to expire. because of my use of memcached as the caching store, I can’t use the regular expression to find caches. so what’s a solution? keeping track of the page numbers that have been viewed? The last solution I want would be expire caches automatically after like 10 mins. Thanks. Yaxm