Ultra fast web development with sinatra

transcript

Ultra fast web development with

Classy hat required.

Ultra fast web development with

featuring

Pedro "Frank" GasparSérgio "Sinatra" Santos

What is Sinatra?

This is

Sinatra!

A small web framework

for server-side applications

in ruby

sinatrarb.com

WindowsOne-Click Installer – go to ruby-lang.org

Mac OSX(pre-installed, draw a hat instead)

Linux (Ubuntu)sudo apt-get install ruby rubygems

Install Sinatrasudo gem install sinatra

Install libs sudo gem install erb dm-core

dm-sqlite-adapter dm-migrations dm-serializer dm-validations serialport

Hello New York

hello.rb:

require 'sinatra'

get '/' do "New York, New York"end

ruby –rubygems hello.rb

go to http://localhost:4567

Ruby 101

Variables

hungry = trueanswer = 42cost = 0.99PI = 3.14name = "Sérgio Santos"

fruit = ['apple', 'banana', 'grape'] # fruit[1] -> 'banana'mix = ['door', 37, 15.2, false]

names = { 'Sérgio' => 'Santos', 'Pedro' => 'Gaspar' }names['Sérgio']

Conditionsif grade >= 10 puts "Yey!"else puts "humpf"end

case minutes_late when 0..5 then puts "on time" when 5..15 then puts "fair" when 15..30 then puts "late" else puts "door closed"end

Cycles

while not hungry puts "work"end

puts "work" while not hungry

1.upto(10) { |n| puts n }

['ruby', 'python', 'php'].each do |language| puts "I can code " + languageend

Functions

def greetings(names) names.each do |first, last| puts "Hello " + first + " " + last endend

names = { 'Sérgio' => 'Santos', 'Pedro' => 'Gaspar' }greetings(names)

Controllers

get '/moon' do "Fly me to the moon…"end

post '/destroy-world' do "Boom"end

get '/hello/:name' do "Hello " + params[:name]end

Sessions

enable :sessions

get '/visit' do session[:visits] = 0 unless session[:visits] session[:visits] += 1 "You visited this page #{session[:visits]} times."end

Filters

before do puts request.ipend

get '/hello' do "Hi!" end

get '/bye' do "Bye!" end

after do puts "All done"end

Templates

Public folder

All files inside the folder 'public' are shared

Great for static files like javascript, css, images…

get '/hello/:name' do "Hello " + params[:name]end

get '/hello/:name' do @name = params[:name] erb :helloend

template :hello do "Hello <%= @name %>"end

get '/hello/:name' do @name = params[:name] erb :helloend

views/hello.erb:Hello <%= @name %>

get '/show' do @names = ['Sérgio', 'Pedro'] erb :showend

views/show.erb:<% if @names.empty? %> This place is empty.<% else %> We got: <% for name in @names %> <%= name %> <% end %><% end %>

views/layout.erb:<html> <head> <title>My Sinatra App</title> </head> <body> <%= yield %> </body></html>

Database

require 'sinatra'require 'dm-core'require 'dm-migrations'

DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/event.sqlite3")

class Person include DataMapper::Resource property :id, Serial property :name, String property :email, String property :date, Time, :default => Time.nowend

DataMapper.auto_upgrade!

BooleanStringTextFloatIntegerDecimalDateTime, Date, Time

http://datamapper.org/docs/properties

Operations

person = Person.create(:name => 'Sérgio‘, :email => 'me@sergiosantos.info')

person = Person.newperson.name = 'Sérgio'person.email = 'me@sergiosantos.info'person.save

person.update(:name => 'Pedro')

person.destroy

http://datamapper.org/docs/create_and_destroy

Operations

Person.get(5)

Person.first( :name => 'Sérgio' )

Person.last

Person.all( :name.like => 'Sérgio' )

Person.all( :date.gt => Time.now – 1 * 60 * 60 ) # Last hour

http://datamapper.org/docs/find

Serializer

require 'dm-serializer'

Person.all.to_xmlPerson.all.to_jsonPerson.all.to_csvPerson.all.to_yaml

Validations

require 'dm-validations'

class Person include DataMapper::Resource property :id, Serial property :name, String property :email, String property :date, Time, :default => Time.now

validates_length_of :name, :within => 3..100 validates_uniqueness_of :emailend

http://datamapper.org/docs/validations

Validationsget '/' do erb :indexend

post '/registration' do @person = Person.create(:name => params['name'], :email => params['email']) if @person.saved? erb :thanks else erb :index endend

views/index:<p style="color: red;"> <% for error in @person.errors %> <%= error %><br/> <% end %></p>

Projects

Ultra fast web development with sinatra

Technology