gistfile1.rb

class DisqusablePresenter < Struct.new(:subject)
  def disqus_id
    dom_id(subject)
  end

  def to_s
    render :partial => 'disqusable/disqus_thread', :locals => {:subject => self}
  end
end

// In the view...
<%= raw DisqusablePresenter.new(@post) %>