The Self Shunt

publishes_posts.rb

class PublishesPosts < Struct.new(:post_id, :ui)
  def run
    Blog.lookup_post(post_id, self)
  end

  def post_found(post)
    post.publish
    ui.post_published(post)
  end

  def no_such_post(post_id)
    ui.no_such_post(post_id)
  end
end