CachedFinder Extension for ActiveRecord

cached_finder.rb

require 'digest/sha1'

module Extensions
  module CachedFinder
    extend ActiveSupport::Concern
    module ClassMethods
      def cached(options = {})
        options_hash = Digest::SHA1.hexdigest(options.to_s)
        Rails.cache.fetch [self.class.to_s.underscore, options_hash].join('/'), :expires_in => 1.hour, :race_condition_ttl => 10 do
          all options
        end
      end
      def clear_cache(options = {})
        options_hash = Digest::SHA1.hexdigest(options.to_s)
        Rails.cache.delete [self.class.to_s.underscore, options_hash].join('/')
      end
    end
  end
end

example_model.rb

class Configurator < ActiveRecord::Base
  include Extensions::CachedFinder

  after_update :clear_cache

  def self.get(label)
    cached(:conditions => ['label = ?',label]).first.value
  end

  private

  def clear_cache
    self.class.clear_cache(:conditions => ['label = ?',label])
  end

end