Ruby Isn’t
Just About Rails
Adam Wiggins
Codemash 2009

?

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Ruby

You can’t sell a platform

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

A programming
language is a platform

is
the
killer
app Ruby
for

Came for Rails,
stayed for Ruby

An explosion of Ruby
projects in the past 2
years

Let’s take a tour!

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

ORM
ActiveRecord

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 =>
[ \"title = ?\", \"First post\" ])

ORM
ActiveRecord
DataMapper
Sequel

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

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 => \"First Post\")

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

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 => \"First Post\").first

Web Layer
ActionPack

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

Web Layer
ActionPack
Merb
Sinatra

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

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

use_orm :datamapper
use_test :rspec
use_template_engine :erb

Merb 2.0 == Rails 3.0

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

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

Test Framework

Unit tests

TDD
Test-Driven Development

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

TATFT
Test All The Darn Time

Test Framework
Test::Unit

class PostTest < Test::Unit::TestCase
def test_simple_slug
post = Post.new :title => \"First Post\"
assert_equal \"first_post\", post.slug
end
def test_complex_slug
post = Post.new :title => \"My Post!\")
assert_equal \"my_post\", post.slug
end
end

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

describe Post do
it \"generates a url slug from the title\" do
post = Post.new :title => \"First Post\"
post.slug.should == \"first_post\"
end
it \"drops punctuation from the url slug\" do
post = Post.new :title => \"My Post!\"
post.slug.should == \"my_post\"
end
end

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

Templating Engine
ERB

<div class=\"post\">
<h1><%= @post.title %></h1>
<div class=\"body\">
<%= @post.body %>
</div>
</div>

Templating Engine
ERB
Haml

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

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

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

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