# How rails check and fetch Page Cache file? **URL:** \ **Category:** Rails\ **Created:** [May 18, 2007, 5:42pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490 "2007-05-18T17:42:15Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 5:42pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/1 "2007-05-18T17:42:15Z")
After posting this question page cache more than 100K files inside a single directory? [http://www.ruby-forum.com/topic/108450#new](http://www.ruby-forum.com/topic/108450#new) I’ve been look into how page caching works. Now I’ve rewritten page\_cache\_file(path) (Module ActionController::Caching::Pages::ClassMethods). now it will divide page\_cache files into subdirectories to avoid more than 10K files to be stored inside a single directory. (788.html-\> 0/788.html; 79780.html-\> 7/9780.html). But since the default save path being changed, rails generate the content from database ignoring the cached files. so, I need to let rails know that cache files’ location are changed Digging for hours, I couldn’t get any idea on how rails check and fetch page cache files. Can anyone give me a clue? ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 7:06pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/2 "2007-05-18T19:06:53Z")
On 5/18/07, Nanyang Z. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > 7/9780.html). > > But since the default save path being changed, rails generate the > content from database ignoring the cached files. > so, I need to let rails know that cache files’ location are changed > > Digging for hours, I couldn’t get any idea on how rails check and fetch > page cache files. > > Can anyone give me a clue? It doesn’t. Your web server’s rewrite routes need to be written in a way that it checks for the existence of a file and serves it before even bothering rails. This is static-heavy sites like the main Rails site and weblog are blazing fast. Apache’s doing the heavy lifting. – Rick O. [http://lighthouseapp.com](http://lighthouseapp.com) [http://weblog.techno-weenie.net](http://weblog.techno-weenie.net) [http://mephistoblog.com](http://mephistoblog.com) ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 7:59pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/3 "2007-05-18T19:59:00Z")
On 5/18/07, Nanyang Z. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > still knew the cache files. It let me believe that the job was done > inside the rails… > so I was wrong… Mongrel does the same thing too. When in doubt, watch your logs for rails requests. > Now I’ll try to use apache’s httpd.conf file. It surely can redirect to > cache file. > Before that, I need to learn complex rewrite rule for mod\_rewrite… > If you’ve done this before, can you give me a quick help? > I need a apache mod\_rewrite rule to rewrite > /data/98 to /data/0/98.html > and > /data/89798 to /data/8/9798.html > (/data/:id, ids are divided into two parts, four digitals for file name, > left will be dir name.) Why not just use the partitioned IDs in the rails routes themselves? – Rick O. [http://lighthouseapp.com](http://lighthouseapp.com) [http://weblog.techno-weenie.net](http://weblog.techno-weenie.net) [http://mephistoblog.com](http://mephistoblog.com) ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 8:14pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/4 "2007-05-18T20:14:24Z")
Rick O. wrote: > Why not just use the partitioned IDs in the rails routes themselves? sorry, I don’t understand. You mean rails know partitioned ids? or you suggest instead of calling /data/89798, but using /data/8/9798 to fetch the data? I think apache rewrite is perfect to do this rewrite job. Faster at least. ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 7:33pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/5 "2007-05-18T19:33:32Z")
Rick O. wrote: > Your web server’s rewrite routes need to be written in a > way that it checks for the existence of a file and serves it before > even bothering rails. I’d tried to remove RewriteRule ^([^.]+)$ $1.html [QSA] from public/.htaccess, but mongrel(development env, without apache) still knew the cache files. It let me believe that the job was done inside the rails… so I was wrong… Now I’ll try to use apache’s httpd.conf file. It surely can redirect to cache file. Before that, I need to learn complex rewrite rule for mod\_rewrite… If you’ve done this before, can you give me a quick help? I need a apache mod\_rewrite rule to rewrite /data/98 to /data/0/98.html and /data/89798 to /data/8/9798.html (/data/:id, ids are divided into two parts, four digitals for file name, left will be dir name.) ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 8:33pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/6 "2007-05-18T20:33:42Z")
finally, I come up with these rewrite rule: RewriteRule ^([^.]+)/(\d{1,4})$ /$1/0/$2.html [QSA] RewriteRule ^([^.]+)/(\d+)(\d{4,})$ /$1/$2/$3.html [QSA] will them work? > I need a apache mod\_rewrite rule to rewrite > /data/98 to /data/0/98.html > and > /data/89798 to /data/8/9798.html > (/data/:id, ids are divided into two parts, four digitals for file name, > left will be dir name.) ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 8:22pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/7 "2007-05-18T20:22:05Z")
> or you suggest instead of calling /data/89798, but using /data/8/9798 to > fetch the data? Yup. > I think apache rewrite is perfect to do this rewrite job. Faster at > least. Ok. – Rick O. [http://lighthouseapp.com](http://lighthouseapp.com) [http://weblog.techno-weenie.net](http://weblog.techno-weenie.net) [http://mephistoblog.com](http://mephistoblog.com) ---
**Author:** ![xain](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/x/82dd89/32.png) [@xain](https://www.ruby-forum.com/u/xain)\ **Post date:** [May 18, 2007, 8:41pm UTC](https://www.ruby-forum.com/t/how-rails-check-and-fetch-page-cache-file/104490/8 "2007-05-18T20:41:19Z")
Rick O. wrote: > > using /data/8/9798 to fetch the data? > > Yup. BTW, this url is ugly and misleading. I won’t use it.