presenter ideas

application_helper.rb

module ApplicationHelper
  def present(subject, klass = nil)
    klass ||= "#{subject.class}Presenter".constantize
    presenter = klass.new(subject, self)
    yield presenter if block_given?
    presenter
  end
end

comment_presenter.rb

class CommentPresenter < Presenter::Base
  def sensitive_attribute
    full_monty ? @subject.sensitive_attribute : "censored"
  end

  private

  def full_monty
    context.current_user == self.author
  end

end

post.html.erb

<% present @post do |post| %>
  <%= post.sensitive_attribute %>
  <% post.present_each_comment do |comment| %>
    <%= comment.sensitive_attribute %>
  <% end %>
<% end %>

post_presenter.rb

class PostPresenter < Presenter::Base
  def sensitive_attribute
    full_monty ? @subject.sensitive_attribute : "censored"
  end

  def present_each_comment
    self.comments.each do |comment|
      yield CommentPresenter.new(comment, context) if block_given?
    end
  end

  private

  def full_monty
    context.current_user == self.author
  end
end

presenter_base.rb

require 'delegate'

class Presenter::Base < SimpleDelegator
  def initialize(subject, context)
    @subject, @context = subject, context
    super(@subject)
  end
  
  def method_missing(sym, *args, &block)
    subject.send(sym, *args, &block)
  end
  
  protected
  
  def subject
    @subject
  end

  def context
    @context
  end
end