Simple Presenter Pattern

application_controller.rb

class ApplicationController < ActionController::Base
  # ...
  
  concerning :Presenters do
    included do
      helper_method :present
    end

    def present(record_or_array, klass)
     if record_or_array.respond_to?(:map)
        record_or_array.map {|item| klass.new(item, view_context) }
      else
        klass.new(record_or_array, view_context)
      end
    end
  end
end

article_presenter.rb

# /app/presenters/article_presenter.rb
class ArticlePresenter < Presenter
  delegate_name :article
  
  def headline_heading
    view.content_tag(:h1, article.headline, class: "article-headline") 
  end
end

articles_controller.rb

class ArticlesController < ApplicationController
  view_accessor :article  # https://gist.github.com/Odaeus/5238423
  
  def show
    self.article = present(Article.find(params[:id]), ArticleDecorator)
  end
end

presenter.rb

# /app/presenters/presenter.rb
class Presenter < SimpleDelegator
  include ERB::Util

  def self.delegate_name(name)
    alias_method name, :__getobj__
  end

  def initialize(base_object, view_context)
    super base_object
    @view_context = view_context
  end

  def view
    @view_context
  end
end

Thank you for this.