Noutati in Rails 4 - prezentata la Cluj.rb

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. ?