Sinatra Basic

Sinatra Up and Running Tarcisio Coutinho 04-10-2013

About Me • Bachelor in Computer Science at CIn -
UFPE • Software Developer • 空手の学生 • git & Github lover @tacsio

What is Sinatra?

What is Sinatra? Isn’t Francis Albert "Frank" Sinatra Even if
He has been a great singer… Now I’m listening him

What is Sinatra? Sinatra is a domain-specific language for building
websites, web services, and web applications in Ruby.

What is Sinatra? It emphasizes a minimalistic approach to development,
offering only what is essential to handle HTTP requests and deliver responses to clients.

Sinatra’s Characteristics • Sinatra is not a framework ◦ Doesn’t
have an ORM ◦ Predefined configuration files ◦ Neither defined structures of directories • Flexible by nature Do What You Want, Cause A Pirate Is Free... You Are A Pirate

Sinatra’s Characteristics • Good option for design APIs • Simple
ecosystem ◦ DSL ◦ HTTP Verbs ◦ Rack Middleware ◦ Sinatra Base

Sinatra’s Characteristics • Simple ecosystem ◦ DSL ▪ Domain Specific
Language ◦ HTTP Verbs ◦ Rack Middleware ◦ Sinatra Base

Sinatra’s Characteristics • Simple ecosystem ◦ DSL ◦ HTTP Verbs
▪ Get Post Put Delete Options ◦ Rack Middleware ◦ Sinatra Base

◦ Rack Middleware ▪ Provides an minimal interface between webservers supporting Ruby and Ruby frameworks. ◦ Sinatra Base

◦ Rack Middleware ◦ Sinatra Base ▪ Sinatra application

Sinatra’s Characteristics • Templating (erb, haml) • Tests/specs (test:unit, rspec)
• Filters (Before/After) • Helpers • Error Handlers • Inline templates • Code reloading (shotgun gem) • HTTP Caching (Etag) • Streams • Rack Middleware

Who is Using It? • Github • Heroku • BBC
• thoughtbot • Songbird • Engine Yard

Let’s start

Sinatra Installation gem install sinatra

Hello Sinatra require ‘sinatra’ get ‘/’ do “Hello, Sinatra!” end

Routing The First Sufficient Match Wins When Sinatra parses routes,
the first sufficient match is the one that will be executed. This is true even when there is a better or more specific route definition later in the file.

HTTP Verbs and REST GET - Is used to ask
a server to return a representation of a resource POST - Is used to submit data to a web server. PUT - Is used to create or update a representation of a resource on a server. DELETE - Is used to destroy a resource on a server.

Not Found (404) & Server Error (500) not_found do “Route
not found!” end error do “Server error!” end

Route Params & Redirects get ‘/posts/:id’ do @post = Post.find(params[:id])
erb :post end post ‘/posts’ do post = Post.create! params redirect “/posts/#{post.id}” end

Static Files Simple way to delivery static files Directory Tree
|-- public | `-- public.html |-- app.rb public.html Hello Sinatra! app.rb require ‘sinatra’

Static Files :: If we got this scenario? Directory Tree
|-- public | `-- public.html |-- static_file.rb require ‘sinatra’ get ‘/public.html’ do “This is delivery via the route.” end

Views & Templates Views in Sinatra are HTML templates that
can optionally contain data passed from the application. Available engines • Erb • Haml • Erubis • ... Template mode • Inline Templates • External Templates

Inline Templates Are defined in the application code file itself
require ‘sinatra’ get ‘/index’ do erb :index_inner end __END__ @@index_inner __END__ @@index_inner <!DOCTYPE html> <html> <body> <h1>Hello Sinatra</h1> </body> </html>

External Templates Sinatra will look for them by default in
the views subfolder. app.erb require ‘sinatra’ get ‘/index’ do @msg = “Hello Sinatra” erb :index end Views directory :: index.erb <!DOCTYPE html> <html> <body> <h1><%= @msg %></h1> </body> </html>

Hands On

And now ?

Suzanna’s Counter Application

Deploy on Heroku

We must configure the database properties Development environment configure :development
do set :database, ‘sqlite3:///db/database.sqlite’ end Production environment configure :development do ActiveRecord::Base.establish_connection(ENV ['DATABASE_URL'] || 'postgres://localhost/mydb') end

Questions ?

References 1. Sinatra: Up and Running - O'Reilly Media 2.
http://www.sinatrarb.com 3. https://github.com/sinatra/sinatra

Sinatra Basic

Sinatra Basic

Tarcisio Coutinho

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Sinatra Up and Running Tarcisio Coutinho 04-10-2013

About Me • Bachelor in Computer Science at CIn -

What is Sinatra?

What is Sinatra? Isn’t Francis Albert "Frank" Sinatra Even if

What is Sinatra? Sinatra is a domain-specific language for building

What is Sinatra? It emphasizes a minimalistic approach to development,

Sinatra’s Characteristics • Sinatra is not a framework ◦ Doesn’t

Sinatra’s Characteristics • Good option for design APIs • Simple

Sinatra’s Characteristics • Simple ecosystem ◦ DSL ▪ Domain Specific

Sinatra’s Characteristics • Simple ecosystem ◦ DSL ◦ HTTP Verbs

Sinatra’s Characteristics • Simple ecosystem ◦ DSL ◦ HTTP Verbs

Sinatra’s Characteristics • Simple ecosystem ◦ DSL ◦ HTTP Verbs

Sinatra’s Characteristics • Templating (erb, haml) • Tests/specs (test:unit, rspec)

Who is Using It? • Github • Heroku • BBC

Let’s start

Sinatra Installation gem install sinatra

Hello Sinatra require ‘sinatra’ get ‘/’ do “Hello, Sinatra!” end

Routing The First Sufficient Match Wins When Sinatra parses routes,

HTTP Verbs and REST GET - Is used to ask

Not Found (404) & Server Error (500) not_found do “Route

Route Params & Redirects get ‘/posts/:id’ do @post = Post.find(params[:id])

Static Files Simple way to delivery static files Directory Tree

Static Files :: If we got this scenario? Directory Tree

Views & Templates Views in Sinatra are HTML templates that

Inline Templates Are defined in the application code file itself

External Templates Sinatra will look for them by default in

Hands On

And now ?

Suzanna’s Counter Application

Deploy on Heroku

We must configure the database properties Development environment configure :development

Questions ?

References 1. Sinatra: Up and Running - O'Reilly Media 2.