Sinatra
Ryan Farnell (@criscokid)

What is Sinatra?

Micro Web Framework
• Built on top of Rack
• Uses RESTful thinking
• URL’s are king

Features
• Routing to code blocks
• Static Files
• Views/Layouts
• Filters
• Helpers

Routing To Blocks
• Routes made up of 3 basic parts
• HTTP Verb
• Match Expression
• Code block

HTTP Verbs
POST GET
PUT DELETE

Demo

Serving Public Files
• If
no matching URL was found, Sinatra checks
the public folder
• Public folder can be changed by setting :public
set :public,'path/to/file/static'

Viewsmarkup
• Views are mixes of code and
• Sinatra works with ERB, HAML, and Builder by
default
• Views are kept in a folder at the root of the site
called “views”
• View folder can be changed by setting :views
set :views,,'path/to/file/static'

Layout
• Layouts are like templates for all your pages.
• Bydefault looks for a file called “layout” in
views with the same extension as the view you
are rendering.
• Default name can be overridden.

Demo

Filters
• Filters run before all routes.
• Theycan modify the Request and Response
object.
• Any instance variable created in the before filter
is available in the route.

Helpers
• Small methods that you find useful.
• Available within the route and within the views.

Demo

Example Apps

Git-Wiki
http://atonie.org/2008/02/git-wiki

Rif-Graf
http://rifgraf.heroku.com/

Github-Services
http://github.com/pjhyett/github-services/tree/maste

Deployment
• Any server compatible with Rack
• Ruby Servers
• Mongrel
• Thin
• Webrick
• Apache running mod_rack (Phusion Passenger)
• FastCGI Server
• Apache
• Lighttpd

http://www.sinatrarb.com/

Q&A