MRO

gistfile1.rb

class A
  def initialize
    puts "A initialized"
  end
end

module B
  def initialize_with_b
    puts "B initialized"
  end
end

A.send :include, B

A.new
# => "A initialized"

module C
  def initialize_with_c
    puts "C initialized"
    initialize_without_c
  end

  def self.included(base)
    base.class_eval do
      alias :initialize_without_c :initialize
      alias :initialize :initialize_with_c
      # or: alias_method_chain :initialize, :c
    end
  end
end

A.send :include, C

A.new
# => "C initialized"
# => "A initialized"