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Introduction to Sinatra
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SINATRANitesh Kumar
Member of technical staff11.12.12
ROADMAP
What is sinatra?
Why sinatra?
Flexibility with sinatra
Singing with sinatra
File hierarchy and naming convention
Features
Sinatra with ActiveRecord
WHAT IS SINATRA?
A micro-framework for web applications
A ruby domain specific language
A ruby “gem”
WHY SINATRA?
Lightweight
Nicely pluggable within other application
Good tool for creating REST-like interface
Support many different template syntaxes.
SINATRA ON RAILS
#in routes.rbmatch “/blog” => MySinatraBlogApp, :anchor =>
false
#Sinatra appClass MySinatraBlogApp < Sinatra::Base
#this now will match /blog/archivesget “/archives” do
“My old posts”end
end
FLEXIBILITY WITH SINATRA :
Template engine ERB, HAML, Builder..
ORM ActiveRecord, DataMapper, Sequel
JS library jQuery, Prototype, YUI, Dojo
Testing tool Test::unit, Rspec, Bacon
LET’S START THE SHOW
gem install sinatra
ruby hello-world.rb
SINGING WITH “SINATRA”
#sample.rb
require ‘rubygems’require ‘sinatra’
get ‘ / ’ do“Why this kolavari kolavari kolavari
di..”end
SO
Every url you wants to respond to goes in your .rb file
Pages themselves goes in /views as .erb files Wrapping layout goes in /views/layout.erb Static files goes in public
|-- beta.rb|--public| `--stylesheets| `--shared.css`-- views |--index.erb |--layout.erb
FEATURES: [ ROUTING ]
Routing to code block
get ‘ / ‘ do“Hello world!”
end“ block ”
Whatever is returned from the block is sent to the browser
FEATURES: [ VIEWS ]
#beta.rb
require ‘rubygems’
require ‘sinatra’
get ‘ / ’ do
erb: index
end
#views/index.erb
<h3> Welcome the my website </h3>
<p>I’m being developed . Thanks for stopping by.</p>
FEATURES: [ LAYOUTS ]
#views/layout.rb
<!DOCTYPE html>
<html>
<head>
<title>Beta Info</title>
</head>
<body>
<%= yield %>
</body>
</html>
#views/index.erb
<h3> Welcome the my website </h3>
<p>I’m being developed . Thanks for stopping by.</p>
FEATURES: [FILTERS]
beforebefore do
MyStore.connect unless MyStore.connected? end
get '/' do @list = MyStore.find(:all) erb :index
end
afterafter do
MyStore.disconnect end
FEATURES: [HELPERS]
helpers dodef bar(name)
"#{name}bar“end
end
get '/:name' dobar(params[:name])
end
DYNAMIC URLS?
#dynamic.rbrequire ‘rubygems’require ‘sinatra’
get ‘ / ’ do“This is homepage.”
end
get ‘/:name’ do‘Hello’ + params[:name] + ‘!’
end
SINATRA WITH ACTIVERECORD
require ‘rubygems’require ‘sinatra’require ‘active_record’
class Article < ActiveRecord::Baseend
get ‘ / ’ doArticle.establish_connection(
:adapter => “sqlite3”,:database => “hw.db”
)Article.first.title
end
REFERENCES
http://sinatra-book.gittr.com/
http://www.sinatrarb.com/
http://www.slideshare.net/Cannikin/classy-web-development-with-ruby-sinatra-and-heroku-1
THANKS!
