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active record cache expensive methods

/ Published in: Ruby
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  1. class ActiveRecord::Base
  2.   @@cache_store = nil
  3.   def self.cache_store
  4.     @@cache_store ||= ActionController::Base.cache_store
  5.   end
  6.  
  7.   def self.caches(method_name, key = nil, options = {}, &block)
  8.     if key.is_a?(Hash)
  9.       options = key
  10.       key     = nil
  11.     end
  12.     define_method "cached_#{method_name}" do
  13.       key = instance_eval(&block) if block
  14.       self.class.cache_store.fetch("#{method_name}:#{key}", options) { send(method_name) }
  15.     end
  16.   end
  17. end
  18.  
  19. class MyModel < ActiveRecord::Base
  20.   caches(:expensive_query, :expires_in => 15.minutes) { "#{id}:#{id.updated_at.to_i}" }
  21. end

URL: https://gist.github.com/20515/67021078e8c1a73260f94e3df29cf514e6334ccb

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