PTW Rails Bootcamp

Rails Bootcamp

Philly.rb PhillyTechWeek

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

• Chapter 1: Overview and Installation
• Chapter 2: Data and Views
• Chapter 3: User Stories and Testing
• Chapter 4: Hack time

Chapter 1: Overview

• Why Rails?
• Rails overview
• Dealing with Data
• Live Console and Testing

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

Controller

Model View

Convention over
Conﬁguration

GET /comments

CommentsController#index

views/comments/index.html.erb

GET /comments/4

CommentsController#show

views/comments/show.html.erb

GET /comments/4.js

CommentsController#show

views/comments/show.js.erb

More Convention over
Conﬁguration

Super simple
•C reate

•R etreive

•U pdate

•D elete

Comment.create(:author => "mat")

INSERT INTO comments
(author) VALUES('mat');

Comment.ﬁnd_by_author("mat")

SELECT * FROM comments
WHERE author = 'mat';

c = Comment.ﬁnd(1)
c.update_attribute(:author, "mat")

SELECT * FROM comments WHERE id = 1;
UPDATE comments SET author = 'mat' WHERE
id = 1;

c = Comment.ﬁnd(1)
c.destroy

SELECT * FROM comments WHERE id = 1;
DELETE FROM comments WHERE id = 1;

more data hotness

• Schema management
• Works the same across databases

rails console

• Try out code live
• Inspect your data using code

testing

• Built into rails
• Strong testing culture built into ruby

services

github.com
heroku.com
engineyard.com
RailsHotline.com

• 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

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

class Team

• name
• (id, created_at, updated_at)

class Location

• name
• address

class Game
• starts_at
• ends_at
• location
• home_team
• away_team

class Game
• starts_at
• ends_at class Location
• location
• home_team
• away_team

class Game
• starts_at
• ends_at class Location
• location
• home_team class Team
• away_team

CODE!
http://bit.ly/railsbc-code

Database Migrations

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

RESTful Routes

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

Can also be nested

• GET /locations/3/games (show games for
one location)

‘public’ folder

• For all static ﬁles
• Rails looks here ﬁrst
• Offers caching options

ERB

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

ActiveRecord
Associations

• 1 to 1 (belongs_to - has_one)
• 1 to many (belongs_to - has_many)
• many to many (has_many :through)

Other points

• Controllers

Chapter 3:

User Stories

Testing

In order to [value]

As a [actor]

I want [feature]

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

Feature: Player listings
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"

Cucumber
Feature: Player listings
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"

User Stories
as Integration Tests

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`

undeﬁned local variable or method `node' for
#<Capybara::Driver::RackTest::Node:...>
(NameError)

• Comment out line 18 in features/
support/env.rb

• cucumber-rails 0.4.0 ﬁxes this, but it’s still in
beta

Running a scenario

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

Debugging

`Then show me the page`
requires ‘launchy’ gem

`Then debug` (debugger;1)
requires ‘ruby-debug’ or ‘ruby-debug19’

`$EDITOR features/support/ﬁxtures.rb`

Before do
Team.create(:name => "Ballshevicks")
end

• Any features/support/*.rb gets loaded

• `Before` gets run before each Scenario

Other Data Options

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

Defining Steps
When I follow "Show" in the row with "Ballshevicks"

When /Î follow "([^"]*)" in the row with "([^"]*)"$/ do |link, text|

When %Q|I follow "#{link}" within "tr:contains('#{text}')"|

end
features/step_definitions/table_steps.rb

Deﬁning Steps

Regular Expression



end

Deﬁning Steps

Regular Expression
Capturing groups



end

Deﬁning Steps

Regular Expression
Capturing groups



end

Deﬁnition in ruby code

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”)

Use for direct testing of

• Models (test/unit/*.rb)
• Helpers (test/unit/helpers/*.rb)
• Controllers (test/functional/*.rb)

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.)

PTW Rails Bootcamp

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Editor's Notes