custom_getters.rb

class Post < ActiveRecord::Base
 
  has_many :authors

  attr_accessor :post_authors_cache

  def post_authors_cache
    @post_authors_cache ||= process_post_authors
  end

  private

  def process_post_authors
    #do some crazy stuff here and set the post_authors_cache
    #some crazy hash of stuff based on some inane business logic
  end

end