Rails 4 was released in 2013 and introduced several new features including stronger security with strong parameters, default security headers, and encrypted cookies. It also improved caching with Russian Doll caching and declarative ETags. Under the hood, ActiveRecord was updated with lazy loading, scope deprecation, and new finder methods.

1. Ce e nou in Rails 4
Florin Oltean
Cluj.rb
2013-04-04

2. Cuprins
• Rails 4
• Nou
• Imbunatatit / schimbat
• Extras

3. Rails 4.0 Beta 1
a fost lansat in 2013-02-25
a fost lansat in 2013-02-25

4. Nou in Rails 4

5. • Minim Ruby 1.9.3
• Preferat Ruby 2.0

6. Caching
• Russian Doll Caching
• Declarative ETags
• turbolinks

7. Securitate
• strong parameters
• default headers
• encrypted cookie

8. Strong parameters
• Mutare logica din Model in Controller
• nu ne mai incurca in locuri in care nu
avem input de la user (consola, teste,
etc.)
• avem acces la ‘current_user’
• white-list
• posibila problema cand accesam acelasi
model din mai multe controllere (!DRY)

9. Strong parameters

10. Default headers

11. Encrypted cookie
• inainte era doar semnat cookie-ul
• tot nu ar trebui sa pune date sensibile in
cookie
• sa punem o referinta si sa stocam
server-side

12. • Suport pentru tipuri de date Postgres
• hstore
• array
• MACADDR, INET, CIDR

13. • Live Streaming
• push de la server pe conexiuni
persistente
• pe versiunile recente de browsere (mai
putin IE)

14. • Metoda HTTP PATCH
• Inlocuieste metoda PUT
• Metoda PATCH trebuie folosita atunci
cand in request nu se trimite resursa
completa
• PUT va mai functiona o vreme

15. • Form helper: date_field
• Chrome
• Safari

16. • application.rb
• console do ... end

17. Schimbat in Rails 4

18. ActiveRecord
• .all => lazy
• .scope => deprecated
• .all.to_a => incarca obiectele din BD

19. ActiveRecord
• .where.not
• Author.where.not(age: 21)
• SELECT "authors".* FROM "authors"
WHERE ("authors"."age" != 21)

20. ActiveRecord
• .order(field: :direction)
• Author.order(name: :desc)
• SELECT "authors".* FROM "authors"
ORDER BY "authors"."name" DESC

21. ActiveRecord
• .find_by(name: "Tom")
• era .find_by_name("Tom")
• .find_or_create_by(name: "Tom")
• era .find_or_create_by_name("Tom")

22. ActiveRecord
• .scope :name, -> { where(...) }
• deprecated:
• .scope :name, where(...)

23. ActiveModel::Model

24. Organizare teste

25. • public/index.html generata intern
• nu mai trebuie stearsa din aplicatiile noi

26. Rute
• match => get, post, ...
• concerns

27. • thread safe on by default (production)
• config.eager_load = true
• ex: http://puma.io/

28. Development
• pagina de eroare imbunatatita

29. Development
• /rails/info

30. Extras din Rails 4

31. • Page and Action Caching
• inlocuit cu Russian Doll Caching
• Observers
• rolul Observerilor era sa fie folositi
pentru invalidarea cache-ului

32. • ActiveResource

33. • SessionStore

34. Ce nu a intrat in Rails 4
• Background Queueing
• Asynchronous ActionMailer

35. Referinte
http://railscasts.com/episodes/400-what-s-new-in-rails-4
http://weblog.rubyonrails.org/2013/2/25/Rails-4-0-beta1/
https://blog.engineyard.com/2013/rails-4-changes
https://blog.engineyard.com/2013/new-in-rails-4

36. Contact
@florin555
florin555@gmail.com

37. ?