Scope Cache Key

This gem adds the cache_key functionality to ActiveRecord scopes.

This is useful when caching a page that contains multiple records. It is now possible to cache the entire page based on a scope. If any record in the scope changes, the entire cache will be busted.

This should likely be used in a Russian Doll Caching scenario.

NOTE: This currently only works with Postgresql. Adding support for MySQL should be trivial.

Installation

Add this line to your application's Gemfile:

gem 'scope_cache_key'

Usage

Example:

<%
scope = Article.page(1) # This should probably be done in your controller!
cache scope do
  # logic to render and cache each article here
end
%>

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request