Ultra fast web development with sinatra
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An introduction to the development of simple web applications with the Sinatra framework.
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Ultra fast web development with sinatra
- 2. Ultra fastwebdevelopmentwith featuring Pedro "Frank" Gaspar Sérgio "Sinatra" Santos
- 5. A smallwebframework for server-sideapplications inruby sinatrarb.com
- 6. Setup
- 7. Windows One-ClickInstaller – go to ruby-lang.org Mac OSX (pre-installed, draw a hatinstead) Linux (Ubuntu) sudoapt-getinstallrubyrubygems
- 8. InstallSinatra sudogeminstallsinatra Installlibs sudogeminstallerbdm-core dm-sqlite-adapterdm-migrations dm-serializerdm-validationsserialport
- 10. hello.rb: require 'sinatra' get '/' do "New York, New York" end
- 11. ruby–rubygemshello.rb go to http://localhost:4567
- 12. Ruby 101
- 13. Variables hungry = true answer = 42 cost = 0.99 PI = 3.14 name = "Sérgio Santos" fruit = ['apple', 'banana', 'grape'] # fruit[1] -> 'banana' mix = ['door', 37, 15.2, false] names = { 'Sérgio' => 'Santos', 'Pedro' => 'Gaspar' } names['Sérgio']
- 14. Conditions if grade >= 10 puts "Yey!" else puts "humpf" end case minutes_late when 0..5 thenputs "ontime" when 5..15 thenputs "fair" when 15..30 thenputs "late" elseputs "doorclosed" end
- 15. Cycles whilenothungry puts "work" end puts "work" whilenothungry 1.upto(10) { |n|puts n } ['ruby', 'python', 'php'].each do |language| puts "I cancode " + language end
- 16. Functions defgreetings(names) names.each do |first, last| puts "Hello " + first + " " + last end end names = { 'Sérgio' => 'Santos', 'Pedro' => 'Gaspar' } greetings(names)
- 17. Controllers
- 18. get '/moon' do "Fly me to themoon…" end post '/destroy-world' do "Boom" end get '/hello/:name' do "Hello " + params[:name] end
- 19. Sessions enable :sessions get '/visit' do session[:visits] = 0 unlesssession[:visits] session[:visits] += 1 "Youvisitedthispage #{session[:visits]} times." end
- 20. Filters before do putsrequest.ip end get '/hello' do "Hi!" end get '/bye' do "Bye!" end after do puts "Alldone" end
- 21. Templates
- 22. Publicfolder All files insidethefolder 'public' are shared Great for static files like javascript, css, images…
- 23. get '/hello/:name' do "Hello " + params[:name] end
- 24. get '/hello/:name' do @name = params[:name] erb :hello end template :hello do "Hello <%= @name %>" end
- 25. get '/hello/:name' do @name = params[:name] erb :hello end views/hello.erb: Hello <%= @name %>
- 26. get '/show' do @names = ['Sérgio', 'Pedro'] erb :show end views/show.erb: <% if @names.empty? %> This place is empty. <% else %> We got: <% for name in @names %> <%= name %> <% end %> <% end %>
- 27. views/layout.erb: <html> <head> <title>My Sinatra App</title> </head> <body> <%= yield %> </body> </html>
- 28. Database
- 29. 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.now end DataMapper.auto_upgrade!
- 30. Types Boolean String Text Float Integer Decimal DateTime, Date, Time http://datamapper.org/docs/properties
- 31. Operations person = Person.create(:name => 'Sérgio‘, :email => 'me@sergiosantos.info') person = Person.new person.name = 'Sérgio' person.email = 'me@sergiosantos.info' person.save person.update(:name => 'Pedro') person.destroy http://datamapper.org/docs/create_and_destroy
- 32. 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
- 33. Serializer require 'dm-serializer' Person.all.to_xml Person.all.to_json Person.all.to_csv Person.all.to_yaml
- 34. 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 :email end http://datamapper.org/docs/validations
- 35. Validations get '/' do erb :index end post '/registration' do @person = Person.create(:name => params['name'], :email => params['email']) if @person.saved? erb :thanks else erb :index end end views/index: <p style="color: red;"> <% for error in @person.errors %> <%= error %><br/> <% end %> </p>
- 36. Projects