Refinement Gotchas From Metaprogramming Ruby Book

gistfile1.rb

#
class MyClass
  def my_method
    "original my_method"
  end
  
  def another_method
    my_method
  end
end

module MyClassRefinement
  refine MyClass do
    def my_method
      "refined my_method"
    end
  end
end

using MyClassRefinement
puts MyClass.new.my_method #=> "refined my_method"
puts MyClass.new.another_method #=> "original my_method"