Nick Sieger-Exploring Rails 3 Through Choices

Rails 3 Through Choices Nick Sieger nsieger@engineyard.com Sunday, March 21, 2010

Nick Sunday, March 21, 2010

@ Sunday, March 21, 2010

EY Cloud Sunday, March 21, 2010

EY Open Source Rails JRuby Rubinius Ruby 1.8.6 Sunday, March 21, 2010

Topic Sunday, March 21, 2010

3 Sunday, March 21, 2010

Sunday, March 21, 2010

Confession Sunday, March 21, 2010

I’m not a web developer Sunday, March 21, 2010

HTML JSON JavaScript SQL CSS XML Ruby HTTP DNS TCP/IP Nginx Apache FCGI Memcached Sunday, March 21, 2010

HTML JSON JavaScript SQL CSS HTTP DNS Ruby XML TCP/IP Nginx Apache FCGI Memcached Sunday, March 21, 2010

= Sunday, March 21, 2010

Ruby in 2010 Sunday, March 21, 2010

Ruby VMs Sunday, March 21, 2010

Ruby 1.8 almost seven years old! Sunday, March 21, 2010

Ruby 1.9.2 August 2010 Sunday, March 21, 2010

JRuby 1.5 April 2010 Sunday, March 21, 2010

Rubinius 1.0 Q2 2010 Sunday, March 21, 2010

Ruby 2.0 Let the prognostication begin Sunday, March 21, 2010

i Sunday, March 21, 2010

paralyzed by choice Sunday, March 21, 2010

opinionated software Sunday, March 21, 2010

making choices Sunday, March 21, 2010

6 years later... Sunday, March 21, 2010

Rails 3 highlights Sunday, March 21, 2010

Rails command $ rails newapp create create README create .gitignore create Rakefile create config.ru create Gemfile create app create app/controllers/application_controller.rb create app/helpers/application_helper.rb create app/models create app/views/layouts create config ... Sunday, March 21, 2010

Options $ rails -h Usage: rails APP_PATH [options] Options: ... -O, [--skip-activerecord] # Skip ActiveRecord files -T, [--skip-testunit] # Skip TestUnit files -J, [--skip-prototype] # Skip Prototype files Sunday, March 21, 2010

Script script/rails s script/rails g script/server script/rails c script/generate script/console rails server rails generate rails console Sunday, March 21, 2010

Layout Sunday, March 21, 2010

Classes class MyController < ApplicationController end class MyModel < ActiveRecord::Base end Sunday, March 21, 2010

Unobtrusive JavaScript Sunday, March 21, 2010

JavaScript: R2 link_to "Delete Image", @image, :confirm => "Are you sure?", :method => :delete <a href="/images/9" onclick="if (confirm('Are you sure?')) { var f = document.createElement('form'); f.style.display = 'none'; this.parentNode.appendChild (f); f.method = 'POST'; f.action = this.href; var m = document.createElement('input'); m.setAttribute('type', 'hidden'); m.setAttribute('name', '_method'); m.setAttribute('value', 'delete'); f.appendChild (m);f.submit(); };return false;">Delete Image</a> Sunday, March 21, 2010

JavaScript: R3 link_to "Delete Image", @image, :confirm => "Are you sure?", :method => :delete <a href="/images/9" rel="nofollow" data-method="delete" data-confirm="Are you sure?">Delete Image</a> Sunday, March 21, 2010

XSS Safety Sunday, March 21, 2010

XSS Safety: R2 <%= h safe_value %> <%= unsafe_value %> Sunday, March 21, 2010

XSS Safety: R3 <%= safe_value %> <%= raw unsafe_value %> Sunday, March 21, 2010

Routing Sunday, March 21, 2010

Routing: R2 map.connect 'products/:id', :controller => 'catalog', :action => 'view' map.resources :products do |products| products.resources :comments products.resources :sales, :collection => { :recent => :get } end Sunday, March 21, 2010

Routing: R3 match 'products/:id' => 'catalog#view' resources :products do resources :comments resources :sales do get :recent, :on => :collection end end Sunday, March 21, 2010

More • Cleaner ActionMailer • ActiveRecord lazy queries • ... Sunday, March 21, 2010

First Online RailsConf http://bit.ly/online-railsconf-slides Sunday, March 21, 2010

APIs as Glue Sunday, March 21, 2010

Railties Sunday, March 21, 2010

The Extension API for Rails Sunday, March 21, 2010

Decoupling http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/ Sunday, March 21, 2010

Decoupling http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/ ActionView ActionController ActiveRecord Sunday, March 21, 2010

Decoupling http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/ ActionController ActionView ActiveRecord Sunday, March 21, 2010

Decoupling http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/ ActionDispatch AbstractController ActionController ActionView ActiveRecord Sunday, March 21, 2010

Decoupling http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/ ActionDispatch View AbstractController Context ActionController ActionView ActiveRecord Sunday, March 21, 2010

Decoupling http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/ ActionDispatch View ActiveModel AbstractController Context ActionController ActionView ActiveRecord Sunday, March 21, 2010

Encapsulate what varies Sunday, March 21, 2010

Railties: Conﬁguration encapsulated Sunday, March 21, 2010

Railtie Elements Initialization Generators Rake Tasks Logging Events Sunday, March 21, 2010

Example require 'rails/railtie' class MemCacheClusterRailtie < Rails::Railtie initializer :setup_mem_cache_cluster do |app| app.config.cache_store = [ :mem_cache_store, 'cache1:11211', 'cache2:11211'] end end Sunday, March 21, 2010

Rails’ Railties ActionController:: ActionDispatch:: Railtie Railtie ActiveRecord:: ActionMailer:: Railtie Railtie Sunday, March 21, 2010

Rails::Railtie Rails::Application Sunday, March 21, 2010

Init: Rails 2 def process Rails.configuration = configuration check_ruby_version install_gem_spec_stubs set_load_path add_gem_load_paths require_frameworks set_autoload_paths add_plugin_load_paths load_environment preload_frameworks initialize_encoding initialize_database initialize_cache initialize_framework_caches initialize_logger initialize_framework_logging initialize_dependency_mechanism Sunday, March 21, 2010

load_application_initializers # the framework is now fully initialized Init: Rails 2 after_initialize # Setup database middleware after initializers have run initialize_database_middleware # Prepare dispatcher callbacks and run 'prepare' callbacks prepare_dispatcher # Routing must be initialized after plugins to allow the former to extend the routes initialize_routing # Observers are loaded after plugins in case Observers or observed models are modified by plugins. load_observers # Load view path cache load_view_paths # Load application classes load_application_classes # Disable dependency loading during request cycle disable_dependency_loading # Flag initialized Rails.initialized = true end Sunday, March 21, 2010

Init: Rails 3 class Rails::Application def initialize! run_initializers(self) self end end Sunday, March 21, 2010

rails newapp --skip-activerecord ActiveRecord::Railtie is not loaded No AR-related conﬁg or generators Sunday, March 21, 2010

Use Railtie to: • Modify conﬁguration/init • Add Rake tasks • Add generators Sunday, March 21, 2010

Rack • Deserves a talk by itself • HTTP request pipeline API • See Ryan Tomayko’s slides from Online RailsConf Sunday, March 21, 2010

ActiveModel Sunday, March 21, 2010

codiﬁes contract between controller and model Sunday, March 21, 2010

Contract class Model def to_model; ...; end def to_key; ...; end def to_param; ...; end def valid?; ...; end def persisted?; ...; end def self.model_name; ...; end def errors; ...; end end Sunday, March 21, 2010

class ModelLintTest < Test::Unit::TestCase def setup @model = Model.new end include ActiveModel::Lint::Tests end Sunday, March 21, 2010

Validations class SimpleModel include ActiveModel::Validations # => Model#valid?, Model#errors # plus validation framework end Sunday, March 21, 2010

class IceCream include ActiveModel::Validations attr_accessor :flavour validates_presence_of :flavour end ic = IceCream.new ic.valid? # => false ic.errors.full_messages # => ["Flavour can't be blank"] ic.flavour = "vanilla" ic.valid? # => true Sunday, March 21, 2010

AMo Modules ActiveModel::Callbacks - before/after hooks ActiveModel::Dirty - dirty attribute tracking ActiveModel::Errors - #errors ActiveModel::Serialization - #to_xml, #to_json, etc. ActiveModel::Translation - I18n for model attributes ActiveModel::Validations - Full validations framework See ActiveModel RDoc comments for more info Sunday, March 21, 2010

Putting it together Sunday, March 21, 2010

JRuby 3 Sunday, March 21, 2010

Explore Rails 3 for yourself! Sunday, March 21, 2010

Photo Credits • http://www.flickr.com/photos/henrybloomfield/2615837191/ • http://www.flickr.com/photos/mountainbread/2528179567/ • http://www.flickr.com/photos/aai/3712515230/ • http://www.flickr.com/photos/mikeschinkel/2703438152/ Sunday, March 21, 2010

Nick Sieger-Exploring Rails 3 Through Choices

by ThoughtWorks on Mar 24, 2010

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Nick Sieger-Exploring Rails 3 Through Choices — Presentation Transcript

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