Cool new things in Rails 3. Presented at WellRailed at 27th January 2010

1. Rails 3
Cool New Things

2. * Caveats

3. Not ready...
● 3.0pre not released yet
● http://oscardelben.com/articles/2009/12/06/how­
to­test­rails­3.html

4. On to Cool Stuff...

5. Have It Your Way

6. More modular
● Standard Rails will work out of the box
● Swap AR with DataMapper
● http://www.slideshare.net/mattetti/rails3­
stepping­off­of­the­golden­path

7. .....

8. ActionController
● Based on Metal
● Swap out stuff you don't need for performance
● http://www.engineyard.com/blog/2010/rails­and­
merb­merge­plugin­api­part­3­of­6/

10. ActiveRecord & Arel

11. Arel
● compose queries using relational algreba (
http://github.com/rails/arel)
● Lazy loading in 3.1
(http://m.onkey.org/2010/1/22/active­record­
query­interface)

12. Arel
http://m.onkey.org/2010/1/22/active­record­query­interface

13. Responders
● respond_to now baked in
● Can make your own responders
● http://weblog.rubyonrails.org/2009/8/31/three­
reasons­love­responder

14.
http://www.engineyard.com/blog/2009/my­five­favorite­things­about­rails­3/

15. New Gem Bundler

16. Bundler
● No more config.gem
● Gemfile
● Evaluates all dependencies at once
● Deploying and freezing native gems !
● http://github.com/wycats/bundler

17. Gemfile

18. Config files *
● config/environment.rb shrunk
● New file : config/application.rb
● Application name seems to matter now
(https://rails.lighthouseapp.com/projects/8994/ti
ckets/3556­app_generator­should­disallow­or­
fix­invalid­app_const)

19. config/environment.rb

20. config/application.rb

21. config/boot.rb

22. Routing
More power to the people

23. Routing
● More flexible
● Can point to any Rack application
● “main#home == MainController.action(:home)
== a Rack application”
● http://yehudakatz.com/2009/12/26/the­rails­3­
router­rack­it­up/

24. Routing

25. Routing

26. ActionMailer
● Looks more like a Controller now
● http://gist.github.com/281420

27. ActionMailer
http://gist.github.com/281420

28. Javascript

29. Javascript
● Unobtrusive
● Easier to swap out with Jquery
● Uses HTML5 data­* attributes

30. Javascript

31. Plugins

32. Plugins
● rspec ­ http://github.com/dchelimsky/rspec­
rails/tree/rails3
● cucumber
http://blazingcloud.net/2010/01/17/notes­from­
rails­3­bugmash
● Others
http://wiki.rubyonrails.org/rails/version3/plugins_
and_gems

33. By the Way....

34. ActiveModel
Get Validations, etc by including
ActiveModel::Validations

35. Rails::Subscriber
● Get hooks for notifications, etc.
● E.g. Output ActiveRecord SQL to Growl
● http://hasmanyquestions.wordpress.com/2010/0
1/17/let­your­sql­growl­in­rails­3/

36. XSS protection
● eRB now escaped by default
● Use raw to not escape
● Try out the plugin
http://github.com/NZKoz/rails_xss

37. Starters
● http://omgbloglol.com/post/344792822/the­path­
to­rails­3­introduction
● http://www.engineyard.com/blog/2009/my­five­
favorite­things­about­rails­3/
● http://rails3.community­
tracker.com/permalinks/5/notes­from­the­field­
upgrading­to­rails­3