Introduction to Sinatra

About
• Koen Van der Auwera
• Co-founder 10to1 (http://10to1.be)
• @atog
• http://atog.be

Sinatra
Sinatra is a Domain Specific Language(DSL) for quickly
creating web-applications in ruby. It keeps a minimal feature
set, leaving the developer to use the tools that best suit
them and their application.

where to start
sudo gem install sinatra

Rack
Rack provides an minimal interface between webservers
supporting Ruby and Ruby frameworks.

require “rubygems”
require “sinatra”
ruby yourapp.rb
Sinatra will look for any Rack compatible
server to run the app in.

http://localhost:4567

not_found do
“whoops-a-daisy”
end
get “/” do
“Hello FOSDEM!”
end

get “/” do
erb :index
end
__END__
@@ index
<h1>Hello FOSDEM</h1>
...or you can use a “views” folder

Familiar Rails Stuff
• Routing
• params
• before filter
• helper methods
• layout

Routing
“/:one/:two/:three”
{\"two\"=>\"b\", \"three\"=>\"c\", \"one\"=>\"a\"}
“/*/alot/*”
{\"splat\"=>[\"a\", \"c\"]}

before, helpers
before do
#whatever you want
end
helper do
#all you helper methods
end

Layout
Pretty much equals application.html.erb in Rails
Provide your html and use <%= yield %>

Public
Use a “public” folder to store your stylesheets, javascript
files and images

Tests? Sure.
require 'sinatra/test/unit
class TestBla < Test::Unit::TestCase
configure do
set :views => File.join(File.dirname(__FILE__), \"..\", \"views\"))
end
def test_home
get \"/\"
assert_equal 200, @response.status
assert @response.body.length > 0
end
def test_submit
post \"/submit\", {:q => \"foo\" }
assert_equal 302, @response.status
end
end

Deployment
Apache + Passenger
config.ru + public
require “yourapp”
set :environment, :production
run Sinatra::Application

Sinatra in action
Go.