A whirlwind tour of the Rails-inspired Ruby ecosystem which has been frantically innovating for the past several years.

1. Ruby Isn’t
Just About Rails
Adam Wiggins
Codemash 2009

2. ?

3. ?
Ruby

6. You can’t sell a platform

7. You can’t sell a platform
...without a killer app.

8. A programming
language is a platform

9. is
the
killer
app Ruby
for

10. Came for Rails,
stayed for Ruby

11. An explosion of Ruby
projects in the past 2
years

12. Let’s take a tour!

13. Rails is:
ORM - ActiveRecord
Web Layer - ActionPack
Templating - ERB
Test Framework - Test::Unit

14. ORM
ActiveRecord

15. class CreatePosts < ActiveRecord::Migration
create_table :posts do |t|
t.string :title
t.text :body
t.datetime :created_at
t.integer :post_id
end
end
$ rake db:migrate
class Post < ActiveRecord::Base
has_many :comments
end
Post.find(:first, :conditions =>
[ quot;title = ?quot;, quot;First postquot; ])

16. ORM
ActiveRecord
DataMapper
Sequel

17. Define schema in the code
instead of the database
http://datamapper.org

18. class Post
include DataMapper::Resource
property :id, Serial
property :title, String
property :body, Text
property :created_at, DateTime
has n, :comments
end
DataMapper.auto_upgrade!
Post.first(:title => quot;First Postquot;)

19. Access a database with
just hashes - or map
models
http://sequel.rubyforge.org

20. db = Sequel.connect('mysql://root@localhost/db')
db.create_table :posts do
primary_key :id
varchar :title
text :body
datetime :created_at
end
db[:posts].filter(:title => quot;First Postquot;).first

21. Web Layer
ActionPack

22. ActionController::Routing::Routes.draw do |map|
map.resource :posts
end
class PostsController < ApplicationController
def create
@post = Post.create! params
redirect_to(@post)
end
def show
@post = Post.find(params[:id])
end
end

23. Web Layer
ActionPack
Merb
Sinatra

24. The hacker’s framework
“No code is faster than no code”
http://merbivore.org

25. Merb::Router.prepare do |router|
resource :posts
end
class Posts < Merb::Controller
def create
@post = Post.create params
redirect(url(:post, @post))
end
def show
@post = Post.find(params[:id])
display @post
end
end

26. use_orm :datamapper
use_test :rspec
use_template_engine :erb

27. Merb 2.0 == Rails 3.0

28. Sinatra
The classy
microframework for Ruby
“Exposed simplicity instead of
hidden complexity”
http://sinatra.rubyforge.org

29. require 'rubygems'
require 'sinatra'
require 'lib/posts'
post '/posts'
post = Post.create! params
redirect quot;/posts/#{post.id}quot;
end
get '/posts/:id' do
@post = Post.find(params[:id])
erb :post
end

30. Test Framework

31. Unit tests

32. TDD
Test-Driven Development

33. BDD
Behavior-Driven
Development
http://behaviour-driven.org

34. TATFT
Test All The Darn Time

35. Test Framework
Test::Unit

36. class PostTest < Test::Unit::TestCase
def test_simple_slug
post = Post.new :title => quot;First Postquot;
assert_equal quot;first_postquot;, post.slug
end
def test_complex_slug
post = Post.new :title => quot;My Post!quot;)
assert_equal quot;my_postquot;, post.slug
end
end

37. RSpec
Behavior-Driven
Development
http://rspec.info

38. describe Post do
it quot;generates a url slug from the titlequot; do
post = Post.new :title => quot;First Postquot;
post.slug.should == quot;first_postquot;
end
it quot;drops punctuation from the url slugquot; do
post = Post.new :title => quot;My Post!quot;
post.slug.should == quot;my_postquot;
end
end

39. $ rake spec:doc
Post
- generates a url slug from the title
- drops punctuation from the url slug

40. Templating Engine
ERB

41. <div class=quot;postquot;>
<h1><%= @post.title %></h1>
<div class=quot;bodyquot;>
<%= @post.body %>
</div>
</div>

42. Templating Engine
ERB
Haml

43. Haml
Markup haiku
http://haml.hamptoncatlin.com

44. .post
%h1= @post.title
.body= @post.body

45. Ties it all together
http://rack.rubyforge.org

46. The End.
http://adam.blog.heroku.com
Adam Wiggins
Codemash 2009