Question

I have the following configuration:

module A
  module B
    def foo
      puts "foo"
    end
  end
end

class C
  include A
end

c = C.new
c.foo
NoMethodError: undefined method `foo' for #<C:0x8765284>

How do I achieve the above?

Thanks.

Answer 1

Module B is “defined” inside of A, it is not “included” in A. This is why you don’t get access to the #foo instance method when you include the A module in C. You could do the following:

class C
  include A::B
end

C.new.foo