DSL or NoDSL - Euruko - 29may2010

DSL or NoDSL? José Valim blog.plataformatec.com @josevalim

DSL or NoDSL? ID blog twitter José Valim blog.plataformatec.com @josevalim

A brief introduction... José Valim blog.plataformatec.com @josevalim

A short story... José Valim blog.plataformatec.com @josevalim

José Valim blog.plataformatec.com @josevalim

mail_form José Valim blog.plataformatec.com @josevalim

Contact form recipe José Valim blog.plataformatec.com @josevalim

Contact form recipe ✦ Controller (20 LOC) José Valim blog.plataformatec.com @josevalim

Contact form recipe ✦ Controller (20 LOC) ✦ Model (30 LOC) José Valim blog.plataformatec.com @josevalim

Contact form recipe ✦ Controller (20 LOC) ✦ Model (30 LOC) ✦ View (30 LOC) José Valim blog.plataformatec.com @josevalim

Contact form recipe ✦ Controller (20 LOC) ✦ Model (30 LOC) ✦ View (30 LOC) ✦ Mailer (15 LOC) José Valim blog.plataformatec.com @josevalim

Contact form recipe ✦ Controller (20 LOC) ✦ Model (30 LOC) ✦ View (30 LOC) ✦ Mailer (15 LOC) ✦ View (20 LOC) José Valim blog.plataformatec.com @josevalim

Let’s create a DSL! José Valim blog.plataformatec.com @josevalim

Domain Speci c Language José Valim blog.plataformatec.com @josevalim

class ContactForm < MailForm::Base to "jose.valim@plataformatec.com.br" from "contact_form@app_name.com" subject "Contact form" attributes :name, :email, :message end ContactForm.new(params[:contact_form]).deliver José Valim blog.plataformatec.com @josevalim

from { |c| "#{c.name} <#{c.email}>" } José Valim blog.plataformatec.com @josevalim

to :author_email def author_email Author.find(self.author_id).email end José Valim blog.plataformatec.com @josevalim

headers { |c| { "X-Spam" => "True" } if c.honey_pot } José Valim blog.plataformatec.com @josevalim

class ContactForm < MailForm::Base to :author_email from { |c| "#{c.name} <#{c.email}>" } subject "Contact form" headers { |c| { "X-Spam" => "True" } if c.honey_pot } attributes :name, :email, :message def author_email Author.find(self.author_id).email end end José Valim blog.plataformatec.com @josevalim

Issues José Valim blog.plataformatec.com @josevalim

Issues ✦ Lacks simplicity José Valim blog.plataformatec.com @josevalim

Issues ✦ Lacks simplicity ✦ Reduces programmer happiness José Valim blog.plataformatec.com @josevalim

NoDSL! José Valim blog.plataformatec.com @josevalim

From: GitHub <noreply@github.com> To: jose.valim@plataformatec.com.br Message-Id: <4bfe3e812c22fc17d@github.com> Subject: [GitHub] someone commented on a commit Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 MESSAGE BODY José Valim blog.plataformatec.com @josevalim

class ContactForm < MailForm::Base attributes :name, :email, :message def headers { :to => author_email, :from => "#{name} <#{email}>", :subject => "Contact form" } end def author_email Author.find(self.author_id).email end end José Valim blog.plataformatec.com @josevalim

It provides a nice DSL José Valim blog.plataformatec.com @josevalim

It relies on a simple contract José Valim blog.plataformatec.com @josevalim

Rack José Valim blog.plataformatec.com @josevalim

class RackApp def self.call(env) [200, { "Content-Type" => "text/html"}, ["Hello"]] end end José Valim blog.plataformatec.com @josevalim

RackApp = Rack::AppBuilder.new do |env| status 200 headers "Content-Type" => "text/html" body ["Hello"] after_return { # do something } end José Valim blog.plataformatec.com @josevalim

Rake and Thor José Valim blog.plataformatec.com @josevalim

task :process do # do some processing end namespace :app do task :setup do # do some setup # end end rake app:setup José Valim blog.plataformatec.com @josevalim

task :process do # do some processing end namespace :app do task :setup do # do some setup Rake::Task[:process].invoke end end rake app:setup José Valim blog.plataformatec.com @josevalim

class Default < Thor def process # do some processing end end class App < Thor def setup # do some setup # end end thor app:setup José Valim blog.plataformatec.com @josevalim

class Default < Thor def process # do some processing end end class App < Thor def setup # do some setup Default.new.process end end thor app:setup José Valim blog.plataformatec.com @josevalim

Rspec and Test::Unit José Valim blog.plataformatec.com @josevalim

# Rspec describe User do it "should be valid" do User.new(@attributes).should be_valid end end # Test::Unit class UserTest < Test::Unit::Case def test_user_validity assert User.new(@attributes).valid? end end José Valim blog.plataformatec.com @josevalim

A nal story... José Valim blog.plataformatec.com @josevalim

class UsersController < ApplicationController def index @users = User.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @users } end end def show @user = User.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @user } end end def new @user = User.new respond_to do |format| format.html # new.html.erb format.xml { render :xml => @user } end end def edit @user = User.find(params[:id]) end Scaﬀold Controller def create @user = User.new(params[:user]) respond_to do |format| if @user.save format.html { redirect_to(@user, :notice => 'User was successfully created.') } format.xml { render :xml => @user, :status => :created, :location => @user } else format.html { render :action => "new" } format.xml { render :xml => @user.errors, :status => :unprocessable_entity } end end end def update @user = User.find(params[:id]) respond_to do |format| if @user.update_attributes(params[:user]) format.html { redirect_to(@user, :notice => 'User was successfully updated.') } format.xml { head :ok } else format.html { render :action => "edit" } format.xml { render :xml => @user.errors, :status => :unprocessable_entity } end end end def destroy @user = User.find(params[:id]) @user.destroy respond_to do |format| format.html { redirect_to(users_url) } format.xml { head :ok } end end end José Valim blog.plataformatec.com @josevalim

class UsersController < ApplicationController restful! end José Valim blog.plataformatec.com @josevalim

class UsersController < ApplicationController restful! create do before { # do something before } success.flash "This is the message" end create.after do # do something after end end José Valim blog.plataformatec.com @josevalim

InheritedResources José Valim blog.plataformatec.com @josevalim

class UsersController < InheritedResources::Base def create # do something before flash[:success] = "This is the message" super # do something after end end José Valim blog.plataformatec.com @josevalim

Bene ts José Valim blog.plataformatec.com @josevalim

Bene ts ✦ Simple José Valim blog.plataformatec.com @josevalim

Bene ts ✦ Simple ✦ Less code to maintain José Valim blog.plataformatec.com @josevalim

Bene ts ✦ Simple ✦ Less code to maintain ✦ More time to focus on important features José Valim blog.plataformatec.com @josevalim

Bene ts ✦ Simple ✦ Less code to maintain ✦ More time to focus on important features ✦ Just Ruby™ José Valim blog.plataformatec.com @josevalim

ORM Callbacks José Valim blog.plataformatec.com @josevalim

# DSL class User < ActiveRecord::Base after_save :deliver_notification, :unless => :admin? end # NoDSL class User < ActiveRecord::Base def save(*) if super deliver_notification unless admin? end end end José Valim blog.plataformatec.com @josevalim

DSL or NoDSL? José Valim blog.plataformatec.com @josevalim

Thank you! José Valim blog.plataformatec.com @josevalim

Questions? Feedback? Opinions? José Valim blog.plataformatec.com @josevalim

Questions? Feedback? Opinions? ID blog twitter José Valim blog.plataformatec.com @josevalim

DSL or NoDSL - Euruko - 29may2010

by Plataformatec on Jun 18, 2010

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DSL or NoDSL - Euruko - 29may2010 — Presentation Transcript