gistfile1.rb

class PostsController
  def index
    @foo = i_want_this_evaluated_in_the_controller
  end
end

# focused_controller

module PostsController
  class Index
    expose(:foo) { i_want_this_evaluated_in_the_controller }
    
    def call
      foo # fuck everything if you have to do this
    end
  end
end