hexagonal rails try

articles_controller.rb

class ArticlesController < ApplicationController
  def create
    PublishArticle.publish(current_user, params[:article]) do |result|
      result.success { |article| redirect_to article_path(article) }
      result.failure { |article| @article = article; render :new }
    end
  end
end

articles_controller_spec.rb

require 'spec_helper'

describe ArticlesController do
  stub_loggged_user

  describe "POST create" do
    def result(result, *args)
      ServiceResult.new(result, *args)
    end

    let(:article) { stub_model(Article) }

    it "publishes a article" do
      PublishArticle.should_receive(:publish).with(current_user, 'these' => 'params').and_yield result(:success, article)
      post :create, :article => {'these' => 'params'}
    end

    it "redirects to article on success" do
      PublishArticle.stub(:publish).and_yield result(:success, article)
      post :create
      controller.should redirect_to article_path(article)
    end

    it "renders new action on failure" do
      PublishArticle.stub(:publish).and_yield result(:failure, article)
      post :create
      controller.should assign_to(:artilce).with(article)
      controller.should render_template :new
    end
  end
end

publish_article

module PublishArticle
  extend self

  def publish(author, attributes)
    article = Article.new(params)
    article.author = author
    result = article.save ? :success : :failure
    ServiceResult.new result, article
  end
end

service_result.rb

module Service
  class Result < BlankObject
    def initialize(result, args)
      @result = result
      @args   = args
    end

    def method_missing(method)
      if @result == method
        yield *@args
      end 
    end
  end
end