Presenters in Rails?

_comment.html.erb

<article>
  <header>
    <h3><%= comment.author %></h3>
  </header>
  <%= comment.body %>
</article>

articles_controller.rb

class ArticlesController < ApplicationController
  def show
    article = Article.find(params[:id])
    comments = article.comments

    @nope = "lol"

    render ArticleView.new(article, comments)
  end

  def render(*args)
    if args.length == 1
      @presenter = args.first
    else 
      super
    end
  end

  def view_assigns
    {:presenter => @presenter }
  end
end

show.html.erb

<article>
  <header>
    <h1><%= @presenter.article.title %></h1>
    <h2><%= @presenter.article.author %></h2>
  </header>
  <p><%= @presenter.article.body %></p>
  <section>
    <h2>Comments</h2>
    <!-- rendering collections is preserved -->
    <%= render @presenter.comments %>
  </section>
</article>
<!-- this was not mutated -->
<h1><%= @presenter.article.title %></h1>
<h2><%= @presenter.article.author %></h2>

<!-- the only thing we expose is @presenter -->
<!-- this will not output anything; the ivar is just nil -->
<%= @nope %>