Rails 5 features you have not heard about

Talk given at Rubyconf Malaysia Rubyconf.my

Transcript

1. Features of Rails 5 you have not heard about
2. Prathamesh Sonpatki @_cha1tanya csonpatki@gmail.com
4. Pune, India
5. Rails issues team
7. Rubyconf.my
8. #MyRubyConf
10. I don’t have Stickers
11. Stickers
12. T-Shirts are fine too
19. New welcome page
21. Rendering views outside of controller
22. Rendering views outside of controller
23. Rendering views outside of controller
24. OrdersController.render :show
25. OrdersController.render :show
26. OrdersController.render json: Order.all
27. OrdersController.render :show
28. OrdersController.render :show, assigns: { order: Order.last }
29. OrdersController.render :show, assigns: { order: Order.last } # /app/views/orders/show.html.erb <%= @order.uid %>
30. Request environment
31. request.env
32. Request environment
33. Request environment
34. >> OrdersController.renderer.defaults => {:http_host=>"example.org", :https=>false, :method=>"get", :script_name=>"", :input=>""}
35. renderer = OrdersController.renderer.new(https: true) renderer.render template: ‘show'
36. renderer = OrdersController.renderer.new(https: true) renderer.render template: ‘show' # order_url => “https://example.org/orders/1”
37. https://github.com/brainopia/backport_new_renderer
38. No longer halts callback chain on false
39. class Order < ActiveRecord::Base before_save :set_eligibility_for_rebate before_save :ensure_credit_card_is_on_file def set_eligibility_for_rebate self.eligibility_for_rebate = decide_eligibility end def ensure_credit_card_is_on_file puts "check if credit card is on file" end end
40. class Order < ActiveRecord::Base before_save :set_eligibility_for_rebate before_save :ensure_credit_card_is_on_file def set_eligibility_for_rebate self.eligibility_for_rebate = decide_eligibility end def ensure_credit_card_is_on_file puts "check if credit card is on file" end end Order.create! => ActiveRecord::RecordNotSaved: ActiveRecord::RecordNotSaved
41. class Order < ActiveRecord::Base before_save :set_eligibility_for_rebate before_save :ensure_credit_card_is_on_file def set_eligibility_for_rebate self.eligibility_for_rebate = decide_eligibility end def ensure_credit_card_is_on_file puts "check if credit card is on file" end end Order.create! => check if credit card is on file => <Order id: 4, eligibility_for_rebate: false>
42. Explicit throw
43. class Order < ActiveRecord::Base before_save :set_eligibility_for_rebate before_save :ensure_credit_card_is_on_file def set_eligibility_for_rebate self.eligibility_for_rebate = decide_eligibility throw(:abort) end def ensure_credit_card_is_on_file puts "check if credit card is on file" end end Order.create! => ActiveRecord::RecordNotSaved: Failed to save the record
45. ActiveSupport.halt_callback_chains_on_return_false = false
46. Faster rendering of partials from cache
47. # index.html.erb <%= render partial: 'todo', collection: @todos %> # _todo.html.erb <% cache todo do %> <%= todo.name %> <% end %>
48. # index.html.erb <%= render partial: 'todo', collection: @todos %> # _todo.html.erb <% cache todo do %> <%= todo.name %> <% end %>
50. Folded into Rails 5
51. # index.html.erb <%= render partial: 'todo', collection: @todos, cached: true %> # _todo.html.erb <% cache todo do %> <%= todo.name %> <% end %>
53. Per job active job adapter ⚡
54. Per job active job adapter ⚡
55. config.active_job.queue_adapter = :sidekiq
56. config.active_job.queue_adapter = :sidekiq
57. config.active_job.queue_adapter = :sidekiq
58. class EmailJob < ActiveJob::Base self.queue_adapter = :sidekiq end class NewletterJob < ActiveJob::Base self.queue_adapter = :delayed_job end
59. class EmailJob < ActiveJob::Base self.queue_adapter = :sidekiq end class NewletterJob < ActiveJob::Base self.queue_adapter = :delayed_job end EmailJob.queue_adapter => #<ActiveJob::QueueAdapters::SidekiqAdapter: 0x007fb3d0b2e4a0> NewletterJob.queue_adapter => #<ActiveJob::QueueAdapters::DealyedJobAdapter: 0x007fb3d0c61b88>
60. Caching in development
61. Caching in development
62. # config/environments/development.rb config.action_controller.perform_caching = false
63. # config/environments/development.rb config.action_controller.perform_caching = true
64. # config/environments/development.rb config.action_controller.perform_caching = true config.cache_store = ??
65. $ rails dev:cache Development mode is now being cached.
66. config.action_controller.perform_caching = true config.static_cache_control = "public, max- age=172800" config.cache_store = :mem_cache_store
67. $ rails dev:cache Development mode is no longer being cached.
68. Puma as default web server
69. Puma as default web server
70. Controller actions default to 204 No Content
73. Browser request
74. def create @post = Post.new(post_params) if @post.save redirect_to @post, notice: 'Post was successfully created.’ else render ‘new’ end end
75. Started POST "/posts" for ::1 at 2016-06-02 09:24:53 -0400 Processing by PostsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"FaRp8NUAZWIW0WnMzLpKKQht9WWeTxeSvOvO2GeFpkGbOXzYEnvxTKEZf7gwY 4oy6cW+GRQ3UE6Zu0iXGB4I5A==", "post"=>{"content"=>"hello"}, "commit"=>"Create Post"} (0.2ms) begin transaction SQL (0.3ms) INSERT INTO "posts" ("content", "created_at", "updated_at") VALUES (?, ?, ?) [["content", "hello"], ["created_at", 2016-06-02 13:24:53 UTC], ["updated_at", 2016-06-02 13:24:53 UTC]] (0.7ms) commit transaction Redirected to http://localhost:3000/posts/1 Completed 302 Found in 6ms (ActiveRecord: 1.3ms)
76. def create @post = Post.new(post_params) if @post.save else render ‘new’ end end
78. Started POST "/posts" for ::1 at 2016-06-02 09:25:11 -0400 Processing by PostsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"RC46YER7l5yQz1J +DkZIWINBixkaMz9qWWlFzvZT8K3Ksy9IgwADsicHRAryn4hDYunAZZBLeLZ8OcOBicheCA==", "post"=>{"content"=>"hello 2"}, "commit"=>"Create Post"} (0.0ms) begin transaction SQL (0.2ms) INSERT INTO "posts" ("content", "created_at", "updated_at") VALUES (?, ?, ?) [["content", "hello 2"], ["created_at", 2016-06-02 13:25:11 UTC], ["updated_at", 2016-06-02 13:25:11 UTC]] (1.5ms) commit transaction No template found for PostsController#create, rendering head :no_content Completed 204 No Content in 64ms (ActiveRecord: 2.2ms)
79. Started POST "/posts" for ::1 at 2016-06-02 09:25:11 -0400 Processing by PostsController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"RC46YER7l5yQz1J +DkZIWINBixkaMz9qWWlFzvZT8K3Ksy9IgwADsicHRAryn4hDYunAZZBLeLZ8OcOBicheCA==", "post"=>{"content"=>"hello 2"}, "commit"=>"Create Post"} (0.0ms) begin transaction SQL (0.2ms) INSERT INTO "posts" ("content", "created_at", "updated_at") VALUES (?, ?, ?) [["content", "hello 2"], ["created_at", 2016-06-02 13:25:11 UTC], ["updated_at", 2016-06-02 13:25:11 UTC]] (1.5ms) commit transaction No template found for PostsController#create, rendering head :no_content Completed 204 No Content in 64ms (ActiveRecord: 2.2ms)
80. Don’t forget to respond
81. Don’t forget to me
82. Request encoding and response parsing ✌
83. post articles_path(format: :json), params: { article: { title: 'Ahoy!' } }.to_json, headers: { 'Content-Type' => 'application/json' }
84. # test_helper.rb def parse_json JSON.parse(response.body) end
85. post articles_path, params: { article: { title: 'Ahoy!' } }, as: :json
86. post articles_path, { article: { title: 'Ahoy!' } }, as: :json assert_equal({ id: Article.last.id, title: 'Ahoy!' }, response.parsed_body)
87. Fragment Caching Action Mailer views
88. Fragment Caching Action Mailer views
89. config.action_mailer.perform_caching = true
90. <body> <% cache 'signup-text' do %> <h1>Welcome!</h1> <p>You have successfully signed up. Your username is: <br /> <% end %> <%= @user.login %>. <br /> </p> <%= render :partial => 'footer' %> </body>
91. <body> <% cache 'signup-text' do %> <h1>Welcome!</h1> <p>You have successfully signed up. Your username is: <br /> <% end %> <%= @user.login %>. <br /> </p> <%= render :partial => 'footer' %> </body>
92. Cache digest for app/views/user_mailer/_footer.erb: 7313427d26cc1f701b1e0212498cee38 Cache digest for app/views/user_mailer/welcome_email.html.erb: 30efff0173fd5f29a88ffe79a9eab617 Rendered user_mailer/_footer.erb (0.3ms) Rendered user_mailer/welcome_email.html.erb (26.1ms) Cache digest for app/views/user_mailer/welcome_email.text.erb: 77f41fe6159c5736ab2026a44bc8de55 Rendered user_mailer/welcome_email.text.erb (0.2ms) UserMailer#welcome_email: processed outbound mail in 190.3ms
93. Active Record Connection handler
94. How to connect to multiple databases
95. class ReadDatabase < ActiveRecord::Base establish_connection :read_db self.abstract_class = true end
96. class User < ReadDatabase end class Admin < ActiveRecord::Base end
97. User.with_readonly_db.where(archive: true)
98. # config/database.yml production: database: ... readonly: database: ...
99. class User < ApplicationRecord self.connection_specification_name = "readonly" end
100. class User < ApplicationRecord def self.connection_specification_name in_readonly_mode? ? "readonly" : "primary" end end
101. Models and Connection handler logic are decoupled
102. speakerdeck.com/ arthurnn/using- multiple- connections-in- activerecord
103. Rails 5.1
104. Keyword args for request methods ⚠
105. class ProductsControllerTest < ActionController::TestCase def test_create post :create, product: { name: "FIFA" } assert_response :success end end Rails 4
106. Positional arguments Rails 4
107. An optional hash of request parameters An optional hash of session variables An optional hash of flash values Rails 4
108. An optional hash of request parameters An optional hash of session variables An optional hash of flash values Rails 4
109. class ProductsControllerTest < ActionController::TestCase def test_create post :create, { product: { name: "FIFA" } }, { user_id: User.first.id } assert_response :success end end Rails 4
110. class ProductsControllerTest < ActionController::TestCase def test_create post :create, nil, { user_id: User.first.id } assert_response :success end end Rails 4
111. Rails 4
113. Ruby 2.2.2+
114. class ProductsControllerTest < ActionController::TestCase def test_create post :create, params: { product: { name: "FIFA" } }, session: { user_id: User.first.id } assert_response :success end end Rails 5
115. DEPRECATION WARNING: ActionController::TestCase HTTP request methods will accept only keyword arguments in future Rails versions. Examples: get :show, params: { id: 1 }, session: { user_id: 1 } process :update, method: :post, params: { id: 1 } Rails 5
116. ActionController::TestCase #=> params flash session xhr Rails 5
117. Secrets of Testing Rails 5 apps @RedDotRubyConf
118. ActionController Parameters no longer inherits from hash ⚠
119. user_params.is_a? Hash #=> true
120. user_params.is_a? ActionController::Parameters #=> true
121. Action Controller Parameters decide what to permit and what to not
122. user_params.is_a? Hash #=> true
123. module ActionController class Parameters < HashWithIndifferentAccess ………… end end
124. module ActionController class Parameters ………… end end
125. # actionpack/lib/action_controller/metal/strong_parameters.rb def to_h if permitted? convert_parameters_to_hashes(@parameters, :to_h) else slice(*self.class.always_permitted_parameters).permit!.to_h end end
126. # actionpack/lib/action_controller/metal/strong_parameters.rb def to_h if permitted? convert_parameters_to_hashes(@parameters, :to_h) else slice(*self.class.always_permitted_parameters).permit!.to_h end end
127. user_params.to_h # Safe hash
128. user_params.to_unsafe_h # Unsafe hash
129. >> user_params.inject DEPRECATION WARNING: Method inject is deprecated and will be removed in Rails 5.1, as `ActionController::Parameters` no longer inherits from hash. Using this deprecated behavior exposes potential security problems. If you continue to use this method you may be creating a security vulnerability in your app that can be exploited. Instead, consider using one of these documented methods which are not deprecated: http://api.rubyonrails.org/v5.0.0/classes/ActionController/ Parameters.html
130. No autoloading after booting in production
131. No autoloading after booting in production
132. No autoloading after booting in production
133. Rails.application.config.enable_dependency_loading = true
134. Autoloading guide
135. guides. rubyonrails.org/ autoloading_and_ reloading_constants. html
136. Testing guide
137. guides. rubyonrails.org/ testing.html
138. Upgrading to Rails 5
139. bin/rails app:update
140. guides.rubyonrails. org/ 5_0_release_notes.ht ml
141. guides.rubyonrails. org/ upgrading_ruby_on_ rails.html
142. Want to know more about Rails 5?
143. Rails 5 Blog Series blog.bigbinary.com /categories/Rails-5
144. Rails 5 Blog Series blog.bigbinary.com /categories/Rails-5
145. This Week in Rails rails-weekly. ongoodbits.com ✉
146. This Week in Rails rails-weekly. ongoodbits.com ✉ ✉
147. New in Rails 5 track railsconf.com/ program
149. https://www.papercall.io/rci17
150. Thanks! @_cha1tanya @_cha1tanya @_cha1tanya