Slides at speakerdeck.com/claudiob Rails 5.1: awesome features & breaking changes

Rails 5.1: awesome features & breaking changes $ git log v4.2.0..v5.0.0 # => 18 months # => 962 authors # => 9,998 commits $ git log v5.0.0..v5.1.0.rc2 # => 9 months # => 450 authors # => 4,065 commits 5.0 5.1

Breaking changes

PR 27757 by Jeremy Evans Change Action View ERB handler from Erubis to Erubi Breaking change

commit 0952552 by Ryuta Kamizono Deprecate String options :if and :unless to set/skip callbacks Breaking change

Deprecate String options to set/skip callbacks class Post < ApplicationRecord before_save :set_no_title, unless: 'title.present?' skip_callback :save, :before, :set_no_title, if: 'persisted?' private def set_no_title self.title = 'No title' end end 5.0

Deprecate String options to set/skip callbacks class Post < ApplicationRecord before_save :set_no_title, unless: -> { title.present? } skip_callback :save, :before, :set_no_title, if: :persisted? private def set_no_title self.title = 'No title' end end 5.1

PR 23980 by Andrew White Deprecate :action and :controller path parameters Breaking change

Deprecate :action and :controller path parameters # config/routes.rb get ':controller(/:action(/:id))' [CVE-2014-0130] Directory traversal vulnerability (4.1.1, 4.0.5) [CVE-2015-7581] Object leak vulnerability (4.2.5, 4.1.13) # config/routes.rb get ':controller(/:action(/:id))' # deprecated get 'photos(/:id)', to: :display # acceptable 5.0 5.1

Active Record

Change default primary keys to BIGINT PR 26266 by Jon McCartie Active Record

Virtual column support for MySQL and MariaDB commit 65bf1c6 by Ryuta Kamizono Active Record

Virtual column support for MySQL and MariaDB class CreateUsers < ActiveRecord::Migration[5.1] def change create_table :users do |t| t.string :name t.virtual :upper_name, type: :string, as: "UPPER(name)" t.virtual :name_length, type: :integer, as: "LENGTH(name)", stored: true, index: true end end end 5.1

commit 451437c by Xavier Noria Adds support for limits in batch processing Active Record

Adds support for limits in batch processing Post.limit(500).find_each.map(&:title) # Scoped order and limit are ignored, it's forced to be batch order and batch size. # => Post Load (0.2ms) SELECT "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT ? [["LIMIT", 1000]] Post.limit(500).find_each.map(&:title) # => Post Load (0.1ms) SELECT "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT ? [["LIMIT", 500]] 5.0 5.1

Active Support

Update Unicode version to 9.0.0 PR 27822 by Fumiaki Matsushima Active Support

Update Unicode version to 9.0.0 ActiveSupport::Multibyte::Unicode::UNICODE_VERSION # => "8.0.0" " " ".mb_chars.grapheme_length # => 4 " " ".mb_chars.reverse # => " " ActiveSupport::Multibyte::Unicode::UNICODE_VERSION # => "9.0.0" " " ".mb_chars.grapheme_length # => 1 " " ".mb_chars.reverse # => " " " 5.0 5.1

Add Duration#after and #before as alias for #since and #until PR 27721 by Nick Johnstone Active Support

Add Duration#after and #before as aliases… 2.weeks.since(christmas_day) # => Mon, 08 Jan 2018 5.days.until(christmas_day) # => Wed, 20 Dec 2017 2.weeks.after(christmas_day) # => Mon, 08 Jan 2018 5.days.before(christmas_day) # => Wed, 20 Dec 2017 5.0 5.1

Introduce Module# delegate_missing_to PR 23930 by Genadi Samokovarov Active Support

Introduce Module#delegate_missing_to class OrderCompletion delegate :destroy, :update, …more methods…, to: :@order def initialize(order) @order = order end def create OrderCompletionNotification.deliver(@order) if @order.save end end 5.0

Introduce Module#delegate_missing_to class OrderCompletion delegate_missing_to :@order def initialize(order) @order = order end def create OrderCompletionNotification.deliver(@order) if @order.save end end 5.1

Action View

New syntax for Action View’s tag helpers PR 25543 by Marek Kirejczyk Action View

New syntax for Action View’s tag helpers tag(:br, nil, true) <%= content_tag :div, class: "strong" do -%> Hello world! <% end -%> tag.br <%= tag.div class: "strong" do %> Hello world! <% end %> 5.0 5.1

PR 26976 by Kasper Timm Hansen Add form_with to unify form_tag and form_for Action View

Add form_with to unify form_tag and form_for # app/views/posts/show.html.erb <%= form_for @post, method: :delete do |f| %> <%= f.submit 'Delete post' %> <% end %> # app/views/posts/show.html.erb <%= form_with model: @post, method: :delete do |f| %> <%= f.submit 'Delete post' %> <% end %> 5.0 5.1

Add form_with to unify form_tag and form_for # app/views/posts/index.html.erb <%= form_tag '/posts/1', method: :delete do %> <%= submit_tag 'Delete post #1' %> <% end %> # app/views/posts/index.html.erb <%= form_with url: '/posts/1', method: :delete do |f| %> <%= submit_tag 'Delete post #1' %> <% end %> 5.0 5.1

Railties

PR 25257 by ta1kt0me Display railtie class name in "rails initializers" Railties

Display railtie class name in `rails initializers` $ rails initializers set_load_path set_load_path [124 more…] $ rails initializers ActionView::Railtie.set_load_path ActionCable::Engine.set_load_path [126 more…] 5.0 5.1

commit e530534 by David Heinemeier Hansson Added a shared section to config/secrets.yml Railties

Added a shared section to config/secrets.yml # config.secrets.yml default: &default email_from: [email protected] development: <<: *default shared: email_from: [email protected] 5.0 5.1

Add encrypted secrets in config/ secrets.yml.enc PR 28038 by Kasper Timm Hansen Railties

Add encrypted secrets in config/secrets.yml.enc # config/secrets.yml # Do not keep production secrets in the repository, # instead read values from the environment. production: secret_key_base: <%= ENV["SECRET_KEY_BASE"] %> $ rails console production > Rails.application.secrets # => {:secret_key_base=>nil, :secret_token=>nil} 5.0 5.0

Add encrypted secrets in config/secrets.yml.enc $ rails secrets:setup Adding config/secrets.yml.key to store the encryption key: 667c… $ more config/secrets.yml.enc # QMdWtttAU5ZJVrsJRFot4j0gCgaqjjsLA0CIFnAhdc+LByI4ILZFwR $ EDITOR=vi rails secrets:edit # See `secrets.yml` for tips on generating suitable keys. production: api_key: "466aac22e6a869134be3d09b9e89232fc2c228" 5.1

PR 27113 by Guillermo Iguaran Drop jQuery as a dependency and include rails-ujs Railties

Drop jQuery as a dependency and include rails-ujs <%= link_to 'Destroy', post, method: :delete, data: {confirm: 'Are you sure?'} %> Destroy

Drop jQuery as a dependency and include rails-ujs <%= link_to 'Destroy', post, method: :delete, data: {confirm: 'Are you sure?'} %> Destroy

Drop jQuery as a dependency and include rails-ujs # Gemfile gem 'jquery-rails' # app/assets/javascripts/application.js //= require jquery //= require jquery_ujs # app/assets/javascripts/application.js //= require rails-ujs 5.0 5.1

PR 26836 by Liceth Ovalles Rodriguez Add Yarn support in new apps using --yarn option Railties

Add Yarn support in new apps $ yarn init $ yarn add bootstrap $ echo ".node_modules/" >> .gitignore # config/initializers/assets.rb config.assets.paths << Rails.root.join('node_modules') # app/assets/stylesheets/application.css *= require bootstrap/dist/css/bootstrap # app/assets/javascripts/application.js //= require bootstrap/dist/js/bootstrap 5.0

Add Yarn support in new apps $ bin/yarn init $ bin/yarn add bootstrap # app/assets/stylesheets/application.css *= require bootstrap/dist/css/bootstrap # app/assets/javascripts/application.js //= require bootstrap/dist/js/bootstrap 5.1

PR 27288 by David Heinemeier Hansson Basic --webpack delegation to new webpacker gem Railties

Basic --webpack delegation to new webpacker gem $ rails new app_name --webpack 5.1 rails webpacker:install Creating javascript app source directory create app/javascript create app/javascript/packs/application.js Copying binstubs create bin/webpack-dev-server create bin/webpack-watcher create bin/webpack Copying webpack core config and loaders create config/webpack/configuration.js create config/webpack/development.js create config/webpack/development.server.js create config/webpack/development.server.yml create config/webpack/paths.yml create config/webpack/production.js create config/webpack/shared.js create config/webpack/loaders create config/webpack/loaders/assets.js create config/webpack/loaders/babel.js create config/webpack/loaders/coffee.js create config/webpack/loaders/erb.js create config/webpack/loaders/sass.js create .postcssrc.yml create .gitignore Installing all JavaScript dependencies run ./bin/yarn add webpack webpack-merge…

Basic --webpack delegation to new webpacker gem $ webpack-dev-server # app/views/layouts/application.html.erb <%= javascript_pack_tag 'application' %> <%= stylesheet_pack_tag 'application' %> # app/javascript/packs/application.js.erb require('moment') <% helpers = ActionController::Base.helpers %> var railsImagePath = "<%= helpers.image_path('rails.png') %>" 5.1

Action Pack

PR 26703 by Eileen M. Uchitelle Capybara integration with Rails (AKA System Tests) Action Pack

Capybara integration with Rails (AKA System Tests)

Capybara integration with Rails (AKA System Tests) # Gemfile group :development, :test do gem 'capybara' gem 'selenium-webdriver' end # test/test_helper.rb require 'capybara/rails' require 'capybara/minitest' […] 5.0

Capybara integration with Rails (AKA System Tests) # test/test_helper.rb class ActionDispatch::IntegrationTest include Capybara::DSL include Capybara::Minitest::Assertions Capybara.register_driver :selenium do |app| Capybara::Selenium::Driver.new app, browser: :chrome end Capybara.default_driver = :selenium end 5.0

Custom URL helpers and polymorphic mapping $ rails test:integration # => 1 runs, 1 assertions, 0 failures # test/integration/posts_test.rb require "test_helper" class PostsTest < ActionDispatch::IntegrationTest test "visiting the 'posts' page" do visit '/posts' assert_selector 'h1', text: 'Posts' end end 5.0

Capybara integration with Rails (AKA System Tests) # test/system/posts_test.rb require "application_system_test_case" class PostsTest < ApplicationSystemTestCase test "visiting the 'posts' page" do visit posts_url assert_selector 'h1', text: 'Posts' end end $ rails test:system # => 1 runs, 1 assertions, 0 failures 5.1

PR 23138 by Andrew White Custom URL helpers and polymorphic mapping Action Pack

Custom URL helpers and polymorphic mapping

Custom URL helpers and polymorphic mapping Comment #2 <%= link_to "Comment #2", post_path(@comment.post, anchor: 'content-2') %> # config/routes.rb direct(:embedded_content) do |content| url_for [content.post, anchor: "content-#{content.id}"] end <%= link_to "Comment #2", embedded_content_path(@comment) %> 5.0 5.1

Custom URL helpers and polymorphic mapping …

Custom URL helpers and polymorphic mapping <%= form_for @profile do |f| %> … <% end %> 5.0

Custom URL helpers and polymorphic mapping # config/routes.rb resource :profile # app/assets/views/profiles/new.html.erb <%= form_for @profile, url: profile_path(@profile) do |f| %> # config/routes.rb resource :profile resolve('Profile') { [:profile] } # app/assets/views/profiles/new.html.erb <%= form_for @profile do |f| %> 5.0 5.1

Rails 5.1: awesome features & breaking changes speakerdeck.com/claudiob Thanks!

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PR 26988 by Pavel Evstigneev Add ActiveRecord::Base. connection_pool.stat Active Record

Add ActiveRecord::Base. connection_pool.stat p ActiveRecord::Base.connection_pool.stat { size: 25, connections: 1, busy: 1, dead: 0, idle: 0, waiting: 0, checkout_timeout: 5 } 5.1

PR 28242 by Andrew White DateTime#change supports :usec and :nsec options Active Support

DateTime#change supports :usec and :nsec options now = DateTime.now now.to_f # => 1490028163.625132 now.change(usec: 0).to_f # => 1490028163.625132 now = DateTime.now now.to_f # => 1490028163.625132 now.change(usec: 0).to_f # => 1490028163.0 DateTime.now.end_of_day.nsec # => 999_999_999 5.0 5.1

PR 27549 by Maksym Pugach Add option :check_parameters to current_page? Action View

Add :check_parameters option to current_page? # From http://www.example.com/shop/checkout?order=desc&page=1 current_page? 'http://www.example.com/shop/checkout' # => true # From http://www.example.com/shop/checkout?order=desc&page=1 current_page? 'http://www.example.com/shop/checkout', check_parameters: true # => false 5.0 5.1

Active Job

PR 25991 by David Heinemeier Hansson Add retry_on/ discard_on for better exception handling Active Job

Add retry_on/discard_on for exception handling class SiteScraperJob < ActiveJob::Base rescue_from(ApocalypticException) rescue_from(ErrorLoadingSite) do retry_job queue: :low_priority end def perform(*args) # raise ErrorLoadingSite if cannot scrape end end 5.0

Add retry_on/discard_on for exception handling class SiteScraperJob < ActiveJob::Base discard_on ApocalypticException retry_on ErrorLoadingSite # retry_on ErrorLoadingSite, wait: :exponentially_longer # retry_on ErrorLoadingSite, wait: ->(attempts) { attempts * 2 } def perform(*args) # raise ErrorLoadingSite if cannot scrape end end 5.1

Action Mailer

Add parameterized invocation of mailers PR 27825 by David Heinemeier Hansson Action Mailer

Add parameterized invocation of mailers class PartyMailer < ApplicationMailer def birthday_invite(guest) mail subject: "Come to my birthday!", to: guest.email_address end def wedding_invite(guest) mail subject: "Come to my wedding!", to: guest.email_address end end PartyMailer.birthday_invite(current_user) 5.0

Add parameterized invocation of mailers class PartyMailer < ApplicationMailer before_action { @guest = params[:guest] } default to: -> { @guest.email_address } def birthday_invite mail subject: "Come to my birthday!" end def wedding_invite; mail subject: "Come to my wedding!"; end end PartyMailer.with(guest: current_user).birthday_invite 5.1

Rails 5.1: awesome features & breaking changes Thanks!