Question

Suppose I have a class A as follows:

class A
  class B
  end
  class C < B
  end
  ...
end

And I want to create a class D that has the same nested class structure as A

class D
  Replicate nested class structure of A here
end

I want D to look like:

class D
  class B
  end
  class C < B
  end
  ...
end

So that I can do A::B and D::B with different results

How can I achieve this? Thanks in advance.

Answer 1

class Module
  def replicate m
    m.constants.each do |sym|
      case mm = m.const_get(sym)
      when Class then const_set(sym, Class.new(mm.superclass)).replicate(mm)
      when Module then const_set(sym, Module.new(mm.superclass)).replicate(mm)
      end
    end
  end
end

class D
  replicate A
end

But the superclass part may not be correct with this code.