Introduction to Sinatra @FOSDEM 2009

1. Introduction to Sinatra

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

3. 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.

4. where to start
sudo gem install sinatra

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

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

7. http://localhost:4567

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

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

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

11. Routing
“/:one/:two/:three”
{quot;twoquot;=>quot;bquot;, quot;threequot;=>quot;cquot;, quot;onequot;=>quot;aquot;}
“/*/alot/*”
{quot;splatquot;=>[quot;aquot;, quot;cquot;]}

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

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

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

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

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

17. Sinatra in action
Go.