Rails 5.1: upcoming features

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

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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

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Breaking changes

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

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

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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

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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

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

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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

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Active Record

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

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

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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

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

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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

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Active Support

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

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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

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

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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

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Introduce Module#
delegate_missing_to
PR 23930 by Genadi Samokovarov
Active
Support

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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

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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

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Action View

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

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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

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

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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

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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

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Railties

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

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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

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

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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

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

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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

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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

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

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

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

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

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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
//= require bootstrap/dist/js/bootstrap
5.0

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

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

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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…

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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

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Action Pack

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

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Capybara integration with Rails (AKA System Tests)

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# Gemfile
group :development, :test do
gem 'capybara'
gem 'selenium-webdriver'
end
# test/test_helper.rb
require 'capybara/rails'
require 'capybara/minitest'
[…]
5.0

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# 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

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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

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# 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

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Custom URL helpers
and polymorphic
mapping
Action
Pack

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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

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…

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<%= form_for @profile do |f| %>
…
<% end %>
5.0

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# 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

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

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One more thing…
Extra time? Extra slides!

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

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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

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DateTime#change
supports :usec
and :nsec options
Active
Support

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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

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

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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

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Active Job

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Add retry_on/
discard_on for better
exception handling
Active
Job

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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

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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

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Action Mailer

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Add parameterized
invocation of mailers
Action
Mailer

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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

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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

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Rails 5.1:
awesome features
& breaking changes
Thanks!

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Rails 5.1: upcoming features

Rails 5.1: upcoming features

Claudio B.

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