A simple case for use ActiveSupport alias_method_chain

alias_method_chain_test.rb

require 'active_support/all'

class Foo
  def foo
    bar
    puts "foo"
  end

  private
  def bar
    puts "bar"
  end
end


module Extend
  extend ActiveSupport::Concern

  included do
    alias_method_chain :foo, :ext
    alias_method_chain :bar, :ext
  end

  def foo_with_ext
    bar
    puts "foo ext"
  end

  def bar_with_ext
    puts "bar ext"
  end
end

foo = Foo.new
foo.foo
puts "==============="

Foo.send(:include, Extend)
foo1 = Foo.new
foo.foo

print

bar
foo
===============
bar ext
foo ext