An Introduction to Ruby on Rails

1. density!"! Ruby on Rails An Historical Introduction Cleveland Web Sig June 19, 2010

3. Overview

4. Joe Fiorini Rails Developer, Technology Evangelist, Husband, Dog Lover

6. density!"!

10. Goals Why to use Rails? What’s Ruby and what’s Rails? How does Rails make developers happy? Where do I go for more information?

11. Assumptions

12. Assumptions Basic HTTP knowledge

13. Assumptions Basic HTTP knowledge Basic object-oriented principles

14. Assumptions Basic HTTP knowledge Basic object-oriented principles Dynamic web development

15. Assumptions Basic HTTP knowledge Basic object-oriented principles Dynamic web development SQL

16. #websigrails For the Twits

19. Core Philosophy

20. DRY Don’t Repeat Yourself

21. Convention Over Conﬁguration Get Started Faster!

22. REST Your Application as an API

23. MVC

24. Model Data Tier

25. View Displayed to the user

26. Controller Tying the model and view together

29. “ I'm trying to make Ruby natural, not simple. Yukihiro “Matz” Matsumoto

31. ActionPack ActiveModel ActionMailer ActiveResource ActiveSupport Railties

40. Life of a Request

41. http://www.densitypop.com/

42. ActionPack ActionDispatch

43. ActionPack Blog3::Application.routes.draw do |map| root :to => "posts#index" end

46. ActionPack ActionDispatch ActionController

47. ActionPack ActionDispatch class PostsController < ApplicationController def index @posts = Post.order("created_at DESC"). limit(10) end end

48. ActionPack ActionDispatch Inheritence class PostsController < ApplicationController def index @posts = Post.order("created_at DESC"). limit(10) end end

49. ActionPack ActionDispatch Instance Method class PostsController < ApplicationController def index @posts = Post.order("created_at DESC"). limit(10) end end

50. ActionPack ActionDispatch Instance Variable (ﬁeld/private variable) class PostsController < ApplicationController def index @posts = Post.order("created_at DESC"). limit(10) end end

51. ActionPack ActionDispatch Class Class method (static) class PostsController < ApplicationController def index @posts = Post.order("created_at DESC"). limit(10) end end

54. ActiveModel ActionDispatch ActionController ActiveRecord

55. ActiveRecord SQLite/ MySQL/ PostgreSQL/…

56. ActiveRecord SQLite/ MySQL/ MongoDB/… posts id title body

57. ActiveRecord SQLite/ MySQL/ MongoDB/… posts id Post title body

58. ActiveRecord class Post < ActiveRecord::Base end

59. ActiveRecord post.title post.body post.id post.save post.destroy

60. ActiveRecord Post.ﬁnd_by_title "Awesomest post ever!" SELECT * FROM posts WHERE title = 'Awesomest post ever!'

61. ActiveRecord Post.where("title = 'Awesomest post ever!'") SELECT * FROM posts WHERE title = 'Awesomest post ever!'

62. ActiveRecord Post.joins(:authors).where("authors.name = 'Joe'") SELECT * FROM posts INNER JOIN authors ON posts.author_id = authors.id WHERE authors.author_name = 'Joe'

63. ActiveRecord Post.ﬁnd_by_title "Awesomest post ever!" vs. Post.where("title = 'Awesomest post ever!'")

64. ActiveRecord class CreatePosts < ActiveRecord::Migration def self.up create_table :posts do |t| t.string :title t.text :body t.timestamps end end def self.down drop_table :posts end end

65. ActiveRecord Validations validates_presence_of validates_uniqueness_of validates_format_of validates_length_of …

66. ActiveRecord http://guides.rails.info RTFM

67. ActiveModel ActionDispatch ActionController class Post < ActiveRecord::Base end

70. ActionPack ActionDispatch ActionController ActiveRecord ActionView

71. ActionPack ActionDispatch ActionController ActiveRecord <ol> <% @posts.each do |post| %> <li class="post"> <h2><%= link_to post.title, post %></h2> <span><%= post.body %></span> </li> <% end %> </ol>

72. ActionPack ActionDispatch Iterator (for loop) ActionController ActiveRecord <ol> <% @posts.each do |post| %> <li class="post"> <h2><%= link_to post.title, post %></h2> <span><%= post.body %></span> </li> <% end %> </ol>

73. ActionPack Block (anonymous function) ActionDispatch ActionController ActiveRecord Block parameter <ol> <% @posts.each do |post| %> do |post| %> <li class="post"> <h2><%= link_to post.title, post %></h2> <span><%= post.body %></span> </li> <% end %> <% end %> </ol>

74. ActionPack ActionDispatch ActionController ActiveRecord Helper method <ol> <% @posts.each do |post| %> <li class="post"> <h2> </h2> <span><%= post.body %></span> %> <%= link_to post.title, post </li> <% end %> </ol>

75. ActionPack ActionDispatch ActionController ActiveRecord Helper method <ol> <% @posts.each do |post| %> <li class="post"> <h2> </h2> <span><%= post.body %></span> %> <%= link_to post.title, post </li> <% end %> <a href="...">Post Title</a> </ol>

77. ActionPack ActionDispatch ActionController ActionView ActiveRecord <html> ... </html>

78. http://densitypop.com/posts/22

80. ActionPack Blog3::Application.routes.draw do |map| resources :posts end

81. GET /posts/new Post#new

82. POST /posts Post#create

83. GET /posts/edit/22 Post#edit

84. PUT /post/22 Post#update

85. GET /posts/22 Post#show

86. DELETE /posts/22 Post#destroy

90. ActionPack ActionDispatch class PostsController < ApplicationController def show @post = Post.ﬁnd(params[:id]) end end

91. ActionPack ActionDispatch Request Parameter Hash class PostsController < ApplicationController def show @post = Post.ﬁnd( ) end params[:id] end

99. ActionPack ActionDispatch ActionController ActiveRecord <h1><%= link_to @post.title, @post %></h1> <span><%= @post.body %></span>

101. ActionPack ActionDispatch ActionController ActionView ActiveRecord <html> ... </html>

102. http://densitypop.com/feed.xml

104. ActionPack Blog3::Application.routes.draw do |map| match 'feed.xml', :to => 'posts#index' end

108. ActionPack ActionDispatch class PostsController < ApplicationController respond_to :xml def index respond_with(@posts = Post. order("created_at DESC"). limit(10)) end end

116. ActionPack ActionDispatch ActionController ActiveRecord atom_feed do |feed| feed.title("Joe's Awesome Blog!") feed.updated(@posts.ﬁrst.created_at) @posts.each do |post| feed.entry(post) do |entry| entry.title(post.title) entry.content(post.body, :type => 'html') entry.author { |author| author.name("Joe") } end end end

117. http://densitypop.com/posts.json

119. ActionPack Blog3::Application.routes.draw do |map| resources :posts end

123. ActionPack ActionDispatch class PostsController < ApplicationController respond_to :xml, :json def index respond_with(@posts = Post. order("created_at DESC"). limit(10)) end end

131. ActionPack ActionDispatch ActionController ActiveRecord [This slide intentionally left blank]

132. There you go. Isn’t that easy?

134. Digging Deeper

135. Nothing is Sacred Anything can be overridden

136. Not all magic Some illusions too

137. Enterprise Ready http://www.workingwithrails.com/high-proﬁle-organisations

138. http://bit.ly/websigrailslinks

139. Resources http://bit.ly/websigrailslinks

140. Cleveland Ruby Brigade http://www.meetup.com/ClevelandRuby http://bit.ly/websigrailslinks

141. Agile Web Dev. with Rails http://pragprog.com/titles/rails4/ http://bit.ly/websigrailslinks

142. Rails 3 in Action http://www.manning.com/katz/ http://bit.ly/websigrailslinks

143. http://bit.ly/websigrailslinks

145. The End

146. http://speakerrate.com/joeﬁorini Please rate this talk (only if it’s good)!

An Introduction to Ruby on Rails

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