Nick Sieger-Exploring Rails 3 Through Choices

Rails 3 Through Choices

Nick [email protected]

Sunday, March 21, 2010

mailto:[email protected]

mailto:[email protected]

Nick


@


EY Cloud


EY Open Source

Rubinius Ruby 1.8.6

JRubyRails


Topic


3


Confession


I’m not a web developer


HTML

CSSJavaScript

Ruby

JSON

XML

SQL

HTTPTCP/IP

DNS

Apache

NginxFCGI Memcached


=Sunday, March 21, 2010

Rubyin 2010


Ruby VMs


Ruby 1.8almost seven years old!


Ruby 1.9.2August 2010


JRuby 1.5April 2010


Rubinius 1.0Q2 2010


Ruby 2.0Let the prognostication begin


iSunday, March 21, 2010

paralyzed bychoice


opinionated software


making choices


6 years later...


Rails 3highlights


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 ...


Options$ rails -hUsage: rails APP_PATH [options]

Options: ... -O, [--skip-activerecord] # Skip ActiveRecord files -T, [--skip-testunit] # Skip TestUnit files -J, [--skip-prototype] # Skip Prototype files


Script

script/serverscript/generatescript/console

script/rails sscript/rails gscript/rails c

rails serverrails generaterails console


Layout


Classes

class MyController < ApplicationControllerend

class MyModel < ActiveRecord::Baseend


Unobtrusive JavaScript


JavaScript: R2link_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>


JavaScript: R3

<a href="/images/9" rel="nofollow" data-method="delete" data-confirm="Are you sure?">Delete Image</a>

link_to "Delete Image", @image, :confirm => "Are you sure?", :method => :delete


XSS Safety


XSS Safety: R2

<%= h safe_value %>

<%= unsafe_value %>


XSS Safety: R3

<%= safe_value %>

<%= raw unsafe_value %>


Routing


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


Routing: R3

match 'products/:id' => 'catalog#view'

resources :products do resources :comments resources :sales do get :recent, :on => :collection endend


More

• Cleaner ActionMailer

• ActiveRecord lazy queries

• ...


First OnlineRailsConf

http://bit.ly/online-railsconf-slides




APIs as Glue


Railties


The Extension APIfor Rails


Decouplinghttp://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/


http://yehudakatz.com/2009/07/19/rails-3-the-great-decoupling/


Decoupling

ActionView

ActionControllerActiveRecord





Decoupling

ActionViewActionController ActiveRecord





ActionDispatch

AbstractController

Decoupling

ActionViewActionController ActiveRecord





ActionDispatch

AbstractController

Decoupling

ActionViewActionController

View Context

ActiveRecord





ActionDispatch

AbstractController

Decoupling

ActionView

ActiveModel

ActionController

View Context

ActiveRecord





Encapsulatewhat varies


Railties:Configuration encapsulated


Initialization Generators

Rake Tasks Logging Events

Railtie Elements


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'] endend


Rails’ Railties

ActionController::Railtie

ActionDispatch::Railtie

ActiveRecord::Railtie

ActionMailer::Railtie


Rails::Railtie

Rails::Application


Init: Rails 2def 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 initialize_whiny_nils

initialize_time_zone initialize_i18n

initialize_framework_settings initialize_framework_views

initialize_metal

add_support_load_paths

check_for_unbuilt_gems

load_gems load_plugins

# pick up any gems that plugins depend on add_gem_load_paths load_gems check_gem_dependencies

# bail out if gems are missing - note that check_gem_dependencies will have # already called abort() unless $gems_rake_task is set return unless gems_dependencies_loaded

load_application_initializers

# the framework is now fully initialized 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 = trueend


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 initialize_whiny_nils

initialize_time_zone initialize_i18n

initialize_framework_settings initialize_framework_views

initialize_metal

add_support_load_paths

check_for_unbuilt_gems

load_gems load_plugins

# pick up any gems that plugins depend on add_gem_load_paths load_gems check_gem_dependencies

# bail out if gems are missing - note that check_gem_dependencies will have # already called abort() unless $gems_rake_task is set return unless gems_dependencies_loaded

load_application_initializers

# the framework is now fully initialized 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 = trueend


Init: Rails 3

class Rails::Application def initialize! run_initializers(self) self endend


rails newapp --skip-activerecord

ActiveRecord::Railtie is not loaded

No AR-related config or generators


• Modify configuration/init

• Add Rake tasks

• Add generators

Use Railtie to:


Rack

• Deserves a talk by itself

• HTTP request pipeline API

• See Ryan Tomayko’s slides from Online RailsConf


ActiveModel


codifies contractbetween

controllerand model


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; ...; endend

Contract


class ModelLintTest < Test::Unit::TestCase def setup @model = Model.new end

include ActiveModel::Lint::Testsend


Validations

class SimpleModel include ActiveModel::Validations

# => Model#valid?, Model#errors # plus validation frameworkend


class IceCream include ActiveModel::Validations attr_accessor :flavour validates_presence_of :flavourend

ic = IceCream.newic.valid? # => falseic.errors.full_messages # => ["Flavour can't be blank"]

ic.flavour = "vanilla"ic.valid? # => true


ActiveModel::Callbacks - before/after hooksActiveModel::Dirty - dirty attribute trackingActiveModel::Errors - #errorsActiveModel::Serialization - #to_xml, #to_json, etc.ActiveModel::Translation - I18n for model attributesActiveModel::Validations - Full validations framework

See ActiveModel RDoc comments for more info

AMo Modules


Putting it together


3

JRuby


Explore Rails 3for yourself!


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/


http://www.flickr.com/photos/henrybloomfield/2615837191/

http://www.flickr.com/photos/henrybloomfield/2615837191/

http://www.flickr.com/photos/mountainbread/2528179567/

http://www.flickr.com/photos/mountainbread/2528179567/

http://www.flickr.com/photos/aai/3712515230/

http://www.flickr.com/photos/aai/3712515230/

http://www.flickr.com/photos/mikeschinkel/2703438152/

http://www.flickr.com/photos/mikeschinkel/2703438152/

Nick Sieger-Exploring Rails 3 Through Choices

Technology

Transcript of Nick Sieger-Exploring Rails 3 Through Choices