What's new in Rails 4. Lucas Caton

Transcription

1 What's new in Rails 4 Lucas Caton

2

3 4

4 June 25, 2013 Rails 4.0: Final version released!

5 Ruby Ruby Ruby Ruby 2.0.0

6 RubyGems 2.x

7 ThreadSafety

8 memcache-client dalli => 20% faster => ThreadSafe => Easier to integrate with NewRelic RPM

9 ActiveRecord 4 ActiveModel

10 #where Post.find_all_by_title('Rails 4') Post.where(title: 'Rails 4')

11 #find_or_* Post.find_or_initialize_by_title('Rails 4') Post.find_or_initialize_by(title:'Rails4')

12 @post.update(post_params)

13 #update_columns Skip validations!

14 = = Post.all ActiveRecord::Relation

15 Scopes scope :sold, where(state: 'sold') default_scope where(state: 'available') scope :sold, ->{ where(state: 'sold') } default_scope ->{ where(state: 'available') }

16 class User < ActiveRecord::Base def visible_posts case role when 'Country Manager' Post.where(country: country) when 'Reviewer' Post.published when 'Bad User' end end end

17 class User < ActiveRecord::Base def visible_posts case role when 'Country Manager' Post.where(country: country) when 'Reviewer' Post.published when 'Bad User' [] end end end

18 @posts = else [] end

19 #none class User < ActiveRecord::Base def visible_posts case role when 'Country Manager' Post.where(country: country) when 'Reviewer' Post.published when 'Bad User' Post.none end end end

20 #not if author Post.where('author!=?', author) else Post.where('author IS NOT NULL') end

21 #not if author Post.where('author!=?', author) else Post.where('author IS NOT NULL') end Post.where.not(author: author)

22 #order User.order('created_at DESC') User.order(:name, 'created_at DESC') User.order(created_at: :desc) User.order(:name, created_at: :desc)

23 4 ActiveModel

24 ActiveModel class SupportTicket include ActiveModel::Conversion include ActiveModel::Validations extend ActiveModel::Naming extend ActiveModel::Translation attr_accessor :title, :description validates_presence_of :title validates_presence_of :description end

25 ActiveModel class SupportTicket include ActiveModel::Model attr_accessor :title, :description validates_presence_of :title validates_presence_of :description end

26 Strong 4 Parameters

27 class User < ActiveRecord::Base attr_accessible :name end # Controller def update notice: 'Updated' end end

28 Strong Parameters class User < ActiveRecord::Base end # Controller def update user_params = params.require(:user).permit(:name) end

29 Strong Parameters class User < ActiveRecord::Base end # Controller def update user_params = params.require(:user).permit(:name) notice: 'Updated' end end

30 4 Routes

31 match '/items/:id/purchase', to: 'items#purchase'

32 XSS Attack (Cross-site Scripting) match '/items/:id/purchase', to: 'items#purchase' post '/items/:id/purchase', to: 'items#purchase' match '/items/:id/purchase', to: 'items#purchase', via: :post match '/items/:id/purchase', to: 'items#purchase', via: :all

33 PATCH Method for HTTP Abstract Several applications extending the Hypertext Transfer Protocol (HTTP) require a feature to do partial resource modification. The existing HTTP PUT method only allows a complete replacement of a document. This proposal adds a new HTTP method, PATCH, to modify an existing HTTP resource.

34 PATCH HTTP verb $ rake routes items GET /items(.:format) items#index POST /items(.:format) items#create new_item GET /items/new(.:format) items#new edit_item GET /items/:id/edit(.:format) items#edit item GET /items/:id(.:format) items#show PUT /items/:id(.:format) items#update PATCH /items/:id(.:format) items#update DELETE /items/:id(.:format) items#destroy

35 Action 4 Controller

36 #before_action before_filter :set_user, only: [:update] before_action :set_user, only: [:update]

37 Encrypted cookie stored in the browser

38 Flash messages <p id="notice"><%= flash[:notice] %></p> <p id="notice"><%= notice %></p>

39 Streaming

40 class FooController < ActionController::Base include ActionController::Live def index 100.times { # Client will see this as it's written response.stream.write "hello world\n" sleep 1 } response.stream.close end end

41 4 Views

42 collections helpers do owner %> <%= radio_button_tag :owner_id, owner.id %> <%= owner.name %> <% end %> collection_radio_buttons(:item, :id, :name) collection_check_boxes(:item, :id, :name)

43 date fields <%= f.date_field :return_date %> <input id="item_return_date" name="item[return_date]" type="date">

44 date fields <%= f.date_field :return_date %>

45 ETags

46 First request

47 First request 1. Render body 2. Create ETag 3. Body & ETag included in response

48 First request 1. Render body 2. Create ETag 3. Body & ETag included in response headers['etag'] = Digest::MD5.hexdigest(body)

49 First request 200 Success headers['etag'] 328ebd07ec6a48ad7f70e44045f184a8 1. Render body 2. Create ETag 3. Body & ETag included in response Second request headers['if-none-match'] 328ebd07ec6a48ad7f70e44045f184a8 304 Not Modified

50 First request 200 Success headers['etag'] 328ebd07ec6a48ad7f70e44045f184a8 1. Render body 2. Create ETag 3. Body & ETag included in response Client caches response Second request headers['if-none-match'] 328ebd07ec6a48ad7f70e44045f184a8 304 Not Modified

51 First request 200 Success headers['etag'] 328ebd07ec6a48ad7f70e44045f184a8 1. Render body 2. Create ETag 3. Body & ETag included in response Client caches response Second request headers['if-none-match'] 328ebd07ec6a48ad7f70e44045f184a8 304 Not Modified

52 First request Client caches response 200 Success headers['etag'] 328ebd07ec6a48ad7f70e44045f184a8 Second request headers['if-none-match'] 328ebd07ec6a48ad7f70e44045f184a8 304 Not Modified 1. Render body 2. Create ETag 3. Body & ETag included in response 1. Render body 2. Create ETag 3. Compare ETag 4. If ETags match then body not included in response

53 First request Client caches response 200 Success headers['etag'] 328ebd07ec6a48ad7f70e44045f184a8 Second request headers['if-none-match'] 328ebd07ec6a48ad7f70e44045f184a8 304 Not Modified 1. Render body 2. Create ETag 3. Body & ETag included in response 1. Render body 2. Create ETag 3. Compare ETag 4. If ETags match then body not included in response

54 First request Client caches response Client reads response from cache 200 Success headers['etag'] 328ebd07ec6a48ad7f70e44045f184a8 Second request headers['if-none-match'] 328ebd07ec6a48ad7f70e44045f184a8 304 Not Modified 1. Render body 2. Create ETag 3. Body & ETag included in response 1. Render body 2. Create ETag 3. Compare ETag 4. If ETags match then body not included in response

55 TurboLinks aka. full body pjax

56

57 turbolinks Gemfile gem 'turbolinks' app/assets/javascripts/application.js //= require turbolinks

58 turbolinks Gemfile gem 'turbolinks' gem 'jquery-turbolinks' app/assets/javascripts/application.js //= require turbolinks //= require jquery.turbolinks

59 turbolinks

60 Other improvements => Routing Concerns => Test Folder Structure => Caching improvements => Custom Flash Types => jbuilder template handler

61 Links Rails Casts - Upgrading to Rails 4 Code School - Learn Rails 4 best practices Rails Guides - Upgrading from Rails 3.2 to Rails 4.0: upgrading_ruby_on_rails.html#upgrading-from-rails-3-2-torails-4-0

62 Thank you!

63 ?