Rails is Just Ruby

Transcript

1. Ruby is Just Rails A Guide to Procrastination and Happiness

2. Stu Rails makes insanely easy Seemingly Magical

3. Protect entire system from unauthorized requests Seemingly Magical

4. Log every page load Seemingly Magical

5. Update full-text search engine every time a record is added

   Seemingly Magical

6. it’s not magic Magic It’s not magic (maybe at first)

7. http:/ /lotr.wikia.com/wiki/File:Gandalf-2.jpg

8. http:/ /www.ibeta.eu/blog/darth-vader-on-tedxeutropolis/

9. Wizard Like Powers Business People consider us wizards with our

   ability to create business value

10. Rails Helps us Along Rails helps us along

11. Rails Helps us Along Blocks

12. Rails Helps us Along Before Filters

13. Rails Helps us Along Callbacks

14. Rails Helps us Along Inheritance

15. Rails Helps us Along It all starts with a block

16. The Block

17. 10.times do puts "YOLO" end

18. None

19. @users.each do |user| <%= user.email %> end

20. User.create do |u| u.name = 'jwo' end

21. @users.map {|u| u.total_due }.sum

22. Rails Helps us Along code that gets delayed and executed

    later

23. Block Rules Every Ruby method can receive a block

24. Block Rules The method has to yield to the block

    to be e ective

25. Block Rules Can take parameters and won’t scream if you

    send in too few

26. args.each do |key,value| end

27. Advanced Blocks Advanced Block Tips

28. Block Rules Don’t use ‘return’ in a block

29. Block Rules Use Ruby’s implicit returns instead

30. Advanced Blocks Add retries for volatile actions

31. 10.times.retry do SomeNetworkCommunicationThingyHere.new end https://github.com/schneems/rrrretry

32. Before Filters

33. Before Filters Used in Controllers

34. Before Filters Rails actions are your interactions with users (get/post

    data)

35. Before Filters Can be before or after

36. Before Filters If your before filter returns, or redirects the

    action won’t happen

37. before_filter do |controller| unless controller.send(:logged_in?) redirect_to new_login_url end end

38. class ApplicationController before_filter :authenticate_user def authenticate_user unless logged_in? redirect_to new_login_url

    end end end

39. class PostsController < AppController # already secured end

40. class PublicPostsController < AppController skip_before_filter :authenticate_user end

41. Callbacks

42. About Callbacks Code you can define to run later works

    in Models too

43. About Callbacks It’s like HollaBack, but not

44. Callback Example Stack Overflow Example: Downcasing email

45. class User < ActiveRecord::Base before_validation do |user| user.email = user.email.downcase

    end end

46. Callback Example Real World Example: Full Text Searching (websolr)

47. class Post < ActiveRecord::Base searchable do text :title, :body end

    end https://github.com/sunspot/sunspot

48. Post.search do fulltext 'best pizza' end https://github.com/sunspot/sunspot

49. after_destroy do |searchable| searchable.remove_from_index end https://github.com/sunspot/sunspot/blob/master/ sunspot_rails/lib/sunspot/rails/searchable.rb

50. Workshop Time

51. Workshop Create a beeper alert program

52. Workshop Criteria if alarm is critical, send SMS

53. Workshop Criteria if alarm is warning, send email

54. I’m JWo Thanks! @jwo Jesse Wolgamott.com