clone_module_incluing_classes.rb

# How does one deep clone a module including all its classes?

module Foo
  class Bar
    def self.baz
      'foo'
    end
  end
end

puts Foo::Bar.baz # => 'foo'

# This solves the problem in this particular case. I'm not entirely sure if it will always work.
Woo = Module.new
Foo.constants.each { |c| Woo.const_set c, Foo.const_get(c).clone }

module Foo
  class Bar
    def self.baz
      'bar'
    end
  end
end

puts Foo::Bar.baz # => 'bar'
puts Woo::Bar.baz # => 'foo'
puts Foo::Bar.object_id == Woo::Bar.object_id ? "Nope": "It works!" # => 'It works!'