actionpack-page_caching
Static page caching for Action Pack (removed from core in Rails 4.0).
Installation
Add this line to your application's Gemfile:
gem 'actionpack-page_caching'
And then execute:
$ bundle
Or install it yourself as:
$ gem install actionpack-page_caching
Usage
Page caching is an approach to caching where the entire action output is stored as a HTML file that the web server can serve without going through Action Pack. This is the fastest way to cache your content as opposed to going dynamically through the process of generating the content. Unfortunately, this incredible speed-up is only available to stateless pages where all visitors are treated the same. Content management systems -- including weblogs and wikis -- have many pages that are a great fit for this approach, but account-based systems where people log in and manipulate their own data are often less likely candidates.
First you need to set page_cache_directory
in your configuration file:
config.action_controller.page_cache_directory = "#{Rails.root.to_s}/public/deploy"
Specifying which actions to cache is done through the caches_page
class method:
class WeblogController < ActionController::Base
caches_page :show, :new
end
This will generate cache files such as weblog/show/5.html
and
weblog/new.html
, which match the URLs used that would normally trigger
dynamic page generation. Page caching works by configuring a web server to first
check for the existence of files on disk, and to serve them directly when found,
without passing the request through to Action Pack. This is much faster than
handling the full dynamic request in the usual way.
See examples for Apache and nginx.
Expiration of the cache is handled by deleting the cached file, which results
in a lazy regeneration approach where the cache is not restored before another
hit is made against it. The API for doing so mimics the options from url_for
and friends:
class WeblogController < ActionController::Base
def update
List.update(params[:list][:id], params[:list])
expire_page action: 'show', id: params[:list][:id]
redirect_to action: 'show', id: params[:list][:id]
end
end
Additionally, you can expire caches using Sweepers that act on changes in the model to determine when a cache is supposed to be expired.
Contributing
- Fork it.
- Create your feature branch (
git checkout -b my-new-feature
). - Commit your changes (
git commit -am 'Add some feature'
). - Push to the branch (
git push origin my-new-feature
). - Create a new Pull Request.