What's coming in Rails 5.2, and sneak peek into Rails 6

The next minor version of Ruby on Rails is right around the corner! Let's look at those new features that are coming in the next few weeks to Rails 5.2, and sneak peek into those new features that will come in Rails 6.0, the next major release of Rails.

Presented at Great Western Rails #3 in Bristol, UK on March 21, 2018 and Tokyo Rubyist Meetup on Apr 4, 2018.

Transcript

1. What's coming in Rails 5.2 and sneak peek into Rails 6 #rails52
2. Prem Sichanugrist @sikachu /sikachu #rails52
4. Pull Request Link https://github.com/rails/rails/pull/25992 #rails52
5. #tag #rails52 https://github.com/rails/rails/pull/25992
6. 5.2 #rails52
7. New Features Custom Mailer Delivery Job H2 Early Hints Headless Chrome and Headless Firefox Support DSL for Configuring CSP Header Verbose Query Log One-Way Migration in change block Active Storage Built-in Redis Cache Store ActiveSupport::CurrentAttributes #rails52
8. Improvements Recycle Cache Keys AEAD Encrypted Cookies Support pg 1.0 Safer Raw SQL handling New Threshold for Cache Compression freeze_time Bootsnap in Default Gemfile #rails52
9. Active Storage #rails52
10. NEW Active Storage #rails52
11. NEW Active Storage #rails52 class User < ApplicationRecord # Associates an attachment and a blob. When the user # is destroyed they are purged by default (models # destroyed, and resource files deleted). has_one_attached :avatar end class AvatarsController < ApplicationController def update # params[:avatar] contains a # ActionDispatch::Http::UploadedFile object Current.user.avatar.attach(params.require(:avatar)) redirect_to Current.user end end
12. NEW Active Storage #rails52 Direct Uploads
13. NEW Active Storage #rails52 # Sprockets (Asset Pipeline) //= require activestorage # Yarn/Webpacker import * as ActiveStorage from "activestorage" ActiveStorage.start() # View file <%= form.file_field :attachments, multiple: true, direct_upload: true %>
14. NEW Active Storage Q: Should I switch to Active Storage from [___________]? #rails52
15. NEW Active Storage Q: Should I switch to Active Storage from [___________]? A: Sure!* #rails52
16. NEW Active Storage Q: Should I use Active Storage for my new project? #rails52
17. NEW Active Storage Q: Should I use Active Storage for my new project? A: Yes. #rails52
18. Recycle Cache Keys #rails52 https://github.com/rails/rails/pull/29092
19. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1-20180320190000"
20. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1-20180320190000" post.update!({ ... }) post.cache_key #=> "post/1-20180320190013"
21. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1-20180320190000" post.update!({ ... }) post.cache_key #=> "post/1-20180320190013" post.update!({ ... }) post.cache_key #=> "post/1-20180320190025"
22. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1-20180320190000" post.update!({ ... }) post.cache_key #=> "post/1-20180320190013" post.update!({ ... }) post.cache_key #=> "post/1-20180320190025" post.update!({ ... }) post.cache_key #=> "post/1-20180320190102"
23. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1-20180320190000" post.update!({ ... }) post.cache_key #=> "post/1-20180320190013" post.update!({ ... }) post.cache_key #=> "post/1-20180320190025" post.update!({ ... }) post.cache_key #=> "post/1-20180320190102" post.update!({ ... }) post.cache_key #=> "post/1-20180320190130"
24. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1-20180320190000" post.update!({ ... }) post.cache_key #=> "post/1-20180320190013" post.update!({ ... }) post.cache_key #=> "post/1-20180320190025" post.update!({ ... }) post.cache_key #=> "post/1-20180320190102" post.update!({ ... }) post.cache_key #=> "post/1-20180320190130"
25. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys "post/3-20180319190000" "post/5-20180317014200" Redis
26. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys "post/1-20180320190013" "post/3-20180319190000" "post/5-20180317014200" Redis
27. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys "post/1-20180320190025" "post/1-20180320190013" "post/3-20180319190000" "post/5-20180317014200" Redis
28. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys "post/1-20180320190102" "post/1-20180320190025" "post/1-20180320190013" "post/3-20180319190000" "post/5-20180317014200" Redis
29. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys "post/1-20180320190130" "post/1-20180320190102" "post/1-20180320190025" "post/1-20180320190013" "post/3-20180319190000" "post/5-20180317014200" Redis
30. ♻ #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys
31. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1" post.cache_version #=> "20180320190000"
32. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1" post.cache_version #=> "20180320190000" post.update!({ ... }) post.cache_key #=> "post/1" post.cache_version #=> "20180320190013"
33. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys post.cache_key #=> "post/1" post.cache_version #=> "20180320190000" post.update!({ ... }) post.cache_key #=> "post/1" post.cache_version #=> "20180320190013" post.update!({ ... }) post.cache_key #=> "post/1" post.cache_version #=> "20180320190025"
34. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys "post/1" "post/3" "post/5" Redis
35. #rails52 https://github.com/rails/rails/pull/29092 Recycle Cache Keys config.active_record.cache_versioning = true
36. AEAD Encrypted Cookies #rails52 https://github.com/rails/rails/pull/28132
37. AEAD Authenticated Encryption with Associated Data #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies
38. Rails 4 AES in CBC mode with HMAC using SHA1 #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies
39. Rails 4 AES in CBC mode with HMAC using SHA1 Rails 5.2 AES-GCM #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies
40. Benefits of AES-GCM #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies
41. Benefits of AES-GCM Faster encryption/decryption #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies
42. Benefits of AES-GCM Faster encryption/decryption Shorter ciphertext #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies
43. #rails52 https://github.com/rails/rails/pull/28132 AEAD Encrypted Cookies config.action_dispatch. use_authenticated_cookie_encryption = true
44. H2 Early Hints Support #rails52 https://github.com/rails/rails/pull/30744
45. Rails 5.2 + Puma + h2o #rails52 https://github.com/rails/rails/pull/30744 H2 Early Hints Support
46. #rails52 https://github.com/rails/rails/pull/30744 H2 Early Hints Support HTTP/1.1 103 Early Hints Link: </application.css>; rel=preload; as=style Link: </application.js>; rel=preload; as=script HTTP/1.1 200 OK Date: Tue, 20 Mar 2018 15:12:00 GMT Content-Length: 4200 Content-Type: text/html; charset=utf-8 Link: </application.css>; rel=preload; as=style Link: </application.js>; rel=preload; as=script
47. #rails52 https://github.com/rails/rails/pull/30744 H2 Early Hints Support <%= preload_link_tag "application.css" %> <link rel="preload" href="/assets/application.css" as="style" type="text/css" />
48. #rails52 https://github.com/rails/rails/pull/30744 H2 Early Hints Support http://eileencodes.com/posts/http2-early-hints/
49. DSL for Configuring CSP Header #rails52 https://github.com/rails/rails/pull/31162
50. Content-Security-Policy Control access to content from a user-agent #rails52 https://github.com/rails/rails/pull/31162 DSL for Configuring CSP Header
51. #rails52 https://github.com/rails/rails/pull/31162 DSL for Configuring CSP Header #config/initializers/content_security_policy.rb Rails.application.config.content_security_policy do |p| p.default_src :self, :https p.font_src :self, :https, :data p.img_src :self, :https, :data p.object_src :none p.script_src :self, :https p.style_src :self, :https, :unsafe_inline # Specify URI for violation reports # p.report_uri "/csp-violation-report-endpoint" end
52. #rails52 https://github.com/rails/rails/pull/31162 DSL for Configuring CSP Header # Override policy inline class PostsController < ApplicationController content_security_policy do |p| p.upgrade_insecure_requests true end end
53. MDN web docs https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy #rails52 https://github.com/rails/rails/pull/31162 DSL for Configuring CSP Header
54. Verbose Query Log #rails52 https://github.com/rails/rails/pull/26815
55. #rails52 https://github.com/rails/rails/pull/26815 Started GET "/news/popular" for ::1 at 2016-10-19 00:5 Processing by NewsController#popular as HTML Version Load (57.3ms) SELECT "versions".* FROM "ve Verbose Query Log
56. #rails52 https://github.com/rails/rails/pull/26815 Started GET "/news/popular" for ::1 at 2016-10-19 00:5 Processing by NewsController#popular as HTML Version Load (57.3ms) SELECT "versions".* FROM "ve ↳ app/views/news/show.html.erb:9:in `_app_views_news Verbose Query Log
57. #rails52 https://github.com/rails/rails/pull/26815 Started GET "/news/popular" for ::1 at 2016-10-19 00:5 Processing by NewsController#popular as HTML Version Load (57.3ms) SELECT "versions".* FROM "ve ↳ app/views/news/show.html.erb:9:in `_app_views_news Verbose Query Log
58. #rails52 https://github.com/rails/rails/pull/26815 config.active_record.verbose_query_logs = true Verbose Query Log
59. ActiveSupport::CurrentAttributes #rails52 https://github.com/rails/rails/pull/29180
60. Subdomain.current Account.current #rails52 https://github.com/rails/rails/pull/29180 ActiveSupport::CurrentAttributes
61. #rails52 https://github.com/rails/rails/pull/29180 ActiveSupport::CurrentAttributes class Subdomain < ApplicationRecord cattr_accessor :current # end class Account < ApplicationRecord def self.current $current_account # end end
62. #rails52 https://github.com/rails/rails/pull/29180 ActiveSupport::CurrentAttributes # app/models/current.rb class Current < ActiveSupport::CurrentAttributes attribute :subdomain attribute :account end
63. Current.subdomain Current.account #rails52 https://github.com/rails/rails/pull/29180 ActiveSupport::CurrentAttributes
64. Thread-Isolated Storage Thread.current[_____] #rails52 https://github.com/rails/rails/pull/29180 ActiveSupport::CurrentAttributes
65. #rails52 https://github.com/rails/rails/pull/29180 ActiveSupport::CurrentAttributes
66. #rails52
67. Built-in Redis Cache Store config.cache_store = :redis_cache_store #rails52 https://github.com/rails/rails/pull/31134
68. New Threshold for Cache Compression Automatically compress value > 1kB #rails52 https://github.com/rails/rails/pull/31147
69. freeze_time Shorthand for travel_to Time.current #rails52 https://github.com/rails/rails/pull/29681
70. Bootsnap in Default Gemfile Add gem "bootsnap" for current projects #rails52 https://github.com/rails/rails/pull/29313
71. Headless Chrome Headless Firefox #rails52 https://github.com/rails/rails/pull/30876
 https://github.com/rails/rails/pull/31365
72. #rails52 https://github.com/rails/rails/pull/30876
 https://github.com/rails/rails/pull/31365 driven_by :selenium, using: :headless_chrome driven_by :selenium, using: :headless_firefox Headless Chrome & Firefox
73. Custom Mailer Delivery Job #rails52 https://github.com/rails/rails/pull/29457
74. #rails52 https://github.com/rails/rails/pull/29457 class MyMailer < ApplicationMailer self.delivery_job = MyCustomDeliveryJob end Custom Mailer Delivery Job
75. 5.2 #rails52
76. 6.0 #rails6
77. #rails6 >= 2.4.1
78. .create_or_find_by Use Unique index to mitigate possible
 race condition in find_or_create_by https://github.com/rails/rails/pull/31989 #rails6
79. Person.pick(:name) Same as Person.pluck(:name).first https://github.com/rails/rails/pull/31941 #rails6
80. Goodbye ‚ utf8 attribute no longer generated in form_tag by default https://github.com/rails/rails/pull/32125 #rails6
81. Goodbye–✓ utf8 attribute no longer generated in form_tag by default https://github.com/rails/rails/pull/32125 #rails6
82. update_attributes → update update_attributes! → update! https://github.com/rails/rails/pull/31998 #rails6
83. Parallel Testing http://edgeguides.rubyonrails.org/testing.html#parallel-testing https://github.com/rails/rails/pull/31900 #rails6
84. Expanded rails routes https://github.com/rails/rails/pull/32130 #rails6
85. https://github.com/rails/rails/pull/32130 #rails6 Expanded rails routes $ rails routes --expanded --[ Route 1 ]------------------------------------------------------------ Prefix | high_scores Verb | GET URI | /high_scores(.:format) Controller#Action | high_scores#index --[ Route 2 ]------------------------------------------------------------ Prefix | new_high_score Verb | GET URI | /high_scores/new(.:format) Controller#Action | high_scores#new --[ Route 3 ]------------------------------------------------------------ Prefix | blog Verb | URI | /blog Controller#Action | Blog::Engine [ Routes for Blog::Engine ] --[ Route 1 ]------------------------------------------------------------ Prefix | cart Verb | GET URI | /cart(.:format) Controller#Action | cart#show
86. 5.2 6.0