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require 'rubygems'
require 'active_record'

class RegisteredModels
  cattr_accessor :models
end

RegisteredModels.models = []

module ModelRegistration
  def self.included base
    base.extend ClassMethods
    (class<<base; self; end).class_eval do
      alias_method_chain :inherited, :registration
    end
  end
  
  module ClassMethods
    def inherited_with_registration sub
      RegisteredModels.models << sub
    end
  end
end

ActiveRecord::Base.send :include, ModelRegistration

class User < ActiveRecord::Base; end

p RegisteredModels.models