1. slideshare.net/matschaffer/wwc-start-launched
bit.ly/wwc-code
From Start to Launched with
Ruby on Rails
Wharton Web Conference

2. Mat Schaffer
mat@mashion.net
@matschaffer
matschaffer.com

4. • Chapter 1: Overview and Installation
• Chapter 2: Data and Views
• Chapter 3: User Stories and Testing
• Chapter 4: Deploy It!

5. Chapter 1: Overview
• Why Rails?
• Rails overview
• Dealing with Data
• Live Console and Testing

6. Why Rails?

7. Rails Overview

8. • Developed for BaseCamp by 37 signals
• DSL for web applications

9. Controller

10. Controller

11. Controller
Model

12. Controller
Model

13. Controller
Model View

14. Controller
Model View

15. Convention over
Configuration

16. GET /comments
CommentsController#index
views/comments/index.html.erb

17. GET /comments/4
CommentsController#show
views/comments/show.html.erb

18. GET /comments/4.js
CommentsController#show
views/comments/show.js.erb

19. Data

20. More Convention over
Configuration

21. Super simple
•C reate
•R etreive
•U pdate
•D elete

22. Comment.create(:author => "mat")
INSERT INTO comments
(author) VALUES('mat');

23. Comment.find_by_author("mat")
SELECT * FROM comments
WHERE author = 'mat';

24. c = Comment.find(1)
c.update_attribute(:author, "mat")
SELECT * FROM comments WHERE id = 1;
UPDATE comments SET author = 'mat' WHERE
id = 1;

25. c = Comment.find(1)
c.destroy
SELECT * FROM comments WHERE id = 1;
DELETE FROM comments WHERE id = 1;

26. more data hotness
• Schema management
• Works the same across databases

27. rails console
• Try out code live
• Inspect your data using code

28. testing
• Built into rails
• Strong testing culture built into ruby

29. services
github.com
heroku.com
engineyard.com
RailsHotline.com

30. Installation

31. • Mac needs XCode first
http://developer.apple.com/xcode/
• Linux or Mac, use RVM bootstrap
http://bit.ly/unixrails
• Windows
http://railsinstaller.org
• Ubuntu on VirtualBox is fun too

32. Test your install
rails new kickballapp
cd kickballapp
rails server
(open a browser to http://localhost:3000)

34. Our project:
A League Manager

35. Chapter 2:
Data
Views

36. Data

37. class Team
• name
• (id, created_at, updated_at)

38. class Location
• name
• address
• (id, created_at, updated_at)

39. class Game
• starts_at
• ends_at
• location
• home_team
• away_team
• (id, created_at, updated_at)

40. class Game
• starts_at
• ends_at class Location
• location
• home_team
• away_team
• (id, created_at, updated_at)

41. class Game
• starts_at
• ends_at class Location
• location
• home_team class Team
• away_team
• (id, created_at, updated_at)

42. CODE!
(generating teams)

43. Database Migrations
• live in db/migrate
• ordered
• Abstracted SQL column types
• includes id and timestamps by default

44. MORE CODE!
(location, game,
migrating)

45. RESTful Routes
• GET /locations (show all locations)
• GET /locations/3 (show one location)
• POST /locations (make a location)
• PUT /locations/3 (update one location)

46. Can also be nested
• GET /locations/3/games (show games for
one location)

47. ‘public’ folder
• For all static files
• Rails looks here first
• Offers caching options

48. Views

49. ERB
• Like JSP/ASP/PHP but in ruby
• lots of helper functions for forms, etc.
• layout → view → partials

50. VIEW CODE!
(fixing the teams)

51. ActiveRecord
Associations
• 1 to 1 (belongs_to - has_one)
• 1 to many (belongs_to - has_many)
• many to many (has_many :through)

52. Controllers

53. Chapter 3:
User Stories
Testing

54. User Stories

55. In order to [value]
As a [actor]
I want [feature]

56. Team roster / player list
feature?

57. In order to know who is on a team
As a league manager
I want to see a list of players on
the team page

58. Feature: Player listings
In order to know who is on a team
As a league manager
I want to see a list of players on the team page
Scenario: listing on a team page
Given I am on the teams page
When I follow "Ballshevicks"
Then I should see "Trotter"

59. Cucumber
Feature: Player listings
In order to know who is on a team
As a league manager
I want to see a list of players on the team page
Scenario: listing on a team page
Given I am on the teams page
When I follow "Ballshevicks"
Then I should see "Trotter"

60. User Stories
as Integration Tests

61. Setting up Cucumber
1. Add `group :development, :test` to Gemfile
2. Add ‘cucumber-rails’, ‘capybara’ and
‘database_cleaner’ in that group
3. Run `bundle`
4. Run `rails generate cucumber:install`
5. `$EDITOR features/players.feature`

62. CODE
(setting it up)

63. Running a scenario
1. Put `@wip` above the scenario
2. Run `rake cucumber:wip`

64. CODE
(running it)

65. Debugging
`Then show me the page`
requires ‘launchy’ gem
`Then debug` (debugger;1)
requires ‘ruby-debug’ or ‘ruby-debug19’

66. CODE
(debugging it)

67. Building data

68. `$EDITOR features/support/fixtures.rb`
Before do
Team.create(:name => "Ballshevicks")
end

69. • Any features/support/*.rb gets loaded
• `Before` gets run before each Scenario

70. Other Data Options
• Load test/fixtures/*.yml
• Use the ‘fabrication’ object factory gem

71. CODE
(giving it data)

72. Defining Steps
When I follow "Show" in the row with "Ballshevicks"
When /^I follow "([^"]*)" in the row with "([^"]*)"$/ do |link, text|
When %Q|I follow "#{link}" within "tr:contains('#{text}')"|
end
features/step_definitions/table_steps.rb

73. Defining Steps
When I follow "Show" in the row with "Ballshevicks"
Regular Expression
When /^I follow "([^"]*)" in the row with "([^"]*)"$/ do |link, text|
When %Q|I follow "#{link}" within "tr:contains('#{text}')"|
end
features/step_definitions/table_steps.rb

74. Defining Steps
When I follow "Show" in the row with "Ballshevicks"
Regular Expression
Capturing groups
When /^I follow "([^"]*)" in the row with "([^"]*)"$/ do |link, text|
When %Q|I follow "#{link}" within "tr:contains('#{text}')"|
end
features/step_definitions/table_steps.rb

75. Defining Steps
When I follow "Show" in the row with "Ballshevicks"
Regular Expression
Capturing groups
When /^I follow "([^"]*)" in the row with "([^"]*)"$/ do |link, text|
When %Q|I follow "#{link}" within "tr:contains('#{text}')"|
end
features/step_definitions/table_steps.rb
Definition in ruby code

76. web_steps.rb
Given I am on the (rake routes) page
When I press “button” / follow “link”
When I fill in “field” with “value”
When I select “option” from “field”
When I check “field”
Then I should see “text” (within “section”)

77. CODE
(assigning teams?)

78. Unit testing

79. Use for direct testing of
• Models (test/unit/*.rb)
• Helpers (test/unit/helpers/*.rb)
• Controllers (test/functional/*.rb)

80. Example:
Player#last_name
class PlayerTest < ActiveSupport::TestCase
test "parses out last name" do
trotter = Player.new(:name => "Trotter Cashion")
assert_equal "Cashion", trotter.last_name
end
end
(Test First! At least try.)

81. CODE
(run and fix it)

82. Chapter 4:
Deploy It!

83. (PaaS)
Heroku

84. (PaaS)
Engine Yard

85. (DIY)
Phusion Passenger

86. (DIY)
LB + Mongrel/Thin

87. (DIY)
Tomcat + JRuby

88. Heroku
https://api.heroku.com/signup

89. http://devcenter.heroku.com/articles/quickstart
$ heroku create
Enter your Heroku credentials.
Email: joe@example.com
Password:
Uploading ssh public key /Users/joe/.ssh/id_rsa.pub
Created http://high-sunrise-58.heroku.com/ |
git@heroku.com:high-sunrise-58.git
Git remote heroku added
$ git push heroku master
...
$ heroku rake db:migrate

90. Heroku demo

91. Thanks!
Some resources
• http://ruby5.envylabs.com/
• http://railscasts.com/
• http://guides.rubyonrails.org/
• http://pragprog.com/book/rails4
• http://www.manning.com/black2/