The Problem is Your Ruby

Many developers dive into writing Rails applications without building a real foundation in Ruby. Instead we focus on the new whiz-bang features of Rails or the hot gem of the week -- missing the awesomeness right in front of us.

Let's talk about Ruby and fill in some of the gaps. This isn't about mind-blowing features and crazy metaprogramming, it's about the fundamentals that are often overlooked in Rails applications.

Transcript

1. The Problem is Your Ruby Thursday, September 22, 11
2. The Problem is Your Ruby Jeff Casimir / @j3 Thursday, September 22, 11
3. Thursday, September 22, 11
4. Rails “Expertise” Thursday, September 22, 11
5. Rails is Not a Language Thursday, September 22, 11
6. Thursday, September 22, 11
7. Ruby Thursday, September 22, 11
8. HTML CSS JavaScript Database Design Ruby OO Design UI/UX Testing DevOps Thursday, September 22, 11
9. Real Skills Thursday, September 22, 11
10. Thursday, September 22, 11
11. OO Design Thursday, September 22, 11
12. Thursday, September 22, 11
13. Thursday, September 22, 11
14. Thursday, September 22, 11
15. Thursday, September 22, 11
16. How I Got Here Thursday, September 22, 11
17. Thursday, September 22, 11
18. Thursday, September 22, 11
19. Thursday, September 22, 11
20. Thursday, September 22, 11
21. Database Design Ruby Thursday, September 22, 11
22. Thursday, September 22, 11
23. Thursday, September 22, 11
24. Thursday, September 22, 11
25. Database Design OO Design Ruby Thursday, September 22, 11
26. Collections Thursday, September 22, 11
27. Thursday, September 22, 11
28. Thursday, September 22, 11
29. Thursday, September 22, 11
30. greens reds Thursday, September 22, 11
31. greens reds Thursday, September 22, 11
32. greens, reds = candy.partition{|m| m.green?} greens reds Thursday, September 22, 11
33. Just One Idea Thursday, September 22, 11
34. Thursday, September 22, 11
35. Application Thursday, September 22, 11
36. Application Module Thursday, September 22, 11
37. Application Class Module Thursday, September 22, 11
38. Application Class Module Method Thursday, September 22, 11
39. Application Class Module Method Line Thursday, September 22, 11
40. Application Class Module Method Line Thursday, September 22, 11
41. U g Person Business Thursday, September 22, 11
42. U g Person Business M Email q Phone First Name Last Name Name Thursday, September 22, 11
43. Contact Thursday, September 22, 11
44. g Business U Person Contact Thursday, September 22, 11
45. class Contact < ActiveRecord::Base has_many :phone_numbers has_many :email_addresses end class Person < Contact def name [last_name, first_name].join ", " end end class Company < Contact end Thursday, September 22, 11
46. Reuse via Module Thursday, September 22, 11
47. class Person < ActiveRecord::Base include Contact def name [last_name, first_name].join ", " end end class Company < ActiveRecord::Base include Contact end Thursday, September 22, 11
48. module Contact def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) end end /app/models/contact.rb Thursday, September 22, 11
49. module Contact def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) end end /app/models/contact.rb Send the message :has_many with parameter :phone_numbers to source Thursday, September 22, 11
50. Utility Objects Thursday, September 22, 11
51. class Article < ActiveRecord::Base before_validation :sanitize_text def sanitize_text self.body.gsub!("Ilias", "Trolololol") end end class Comment < ActiveRecord::Base before_validation :sanitize_text def sanitize_text self.body.gsub!("Ilias", "Trolololol") end end Thursday, September 22, 11
52. module TextDecorator module InstanceMethods def sanitize_text(input) input.gsub!("Ilias", "Trolololol") end end def self.included(source) source.send(:include, InstanceMethods) end end class Article < ActiveRecord::Base include TextDecorator before_validation :sanitize_text end Thursday, September 22, 11
53. module TextDecorator def self.sanitize_text(input) input.gsub!("Ilias", "Trolololol") end end /app/lib/text_decorator.rb class Article < ActiveRecord::Base before_validation { TextDecorator.sanitize_text(body) } end class Comment < ActiveRecord::Base before_validation { TextDecorator.sanitize_text(body) } end Thursday, September 22, 11
54. Clear over Clever Thursday, September 22, 11
55. Refactoring Thursday, September 22, 11
56. Thursday, September 22, 11
57. Thursday, September 22, 11
58. Thursday, September 22, 11
59. Scopes Thursday, September 22, 11
60. ## Rails 2 Way class Article < ActiveRecord::Base named_scope :published, {:conditions => [:published => true]} named_scope :recent, {:limit => 5, :order => "published_at DESC"} end # Usage: Article.published.recent Thursday, September 22, 11
61. ## Rails 3 Way class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, limit(5).order("published_at DESC") end Thursday, September 22, 11
62. ## Rails 3 Way class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, limit(5).order("published_at DESC") end ## Rails 3 using Class Methods class Article < ActiveRecord::Base def self.published where(:published => true) end def self.recent limit(5).order("published_at DESC") end end Thursday, September 22, 11
63. class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, lambda{|max| limit(max).order("published_at DESC")} end Thursday, September 22, 11
64. class Article < ActiveRecord::Base scope :published, where(:published => true) scope :recent, lambda{|max| limit(max).order("published_at DESC")} end class Article < ActiveRecord::Base def self.published where(:published => true) end def self.recent(max) limit(max).order("published_at DESC") end end Thursday, September 22, 11
65. AS::Concern Thursday, September 22, 11
66. module Contact module InstanceMethods def photo_filename name.parameterize + ".jpg" end end def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) source.send(:include, InstanceMethods) end end Normal Ruby Module Thursday, September 22, 11
67. module Contact extend ActiveSupport::Concern module InstanceMethods def photo_filename name.parameterize + ".jpg" end end included do has_many :phone_numbers has_many :email_addresses end end Using ActiveSupport::Concern Thursday, September 22, 11
68. def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) source.send(:include, InstanceMethods) end Send the message :include with parameter InstanceMethods to source Thursday, September 22, 11
69. module Contact module InstanceMethods def photo_filename name.parameterize + ".jpg" end end def self.included(source) do source.send(:has_many, :phone_numbers) source.send(:has_many, :email_addresses) source.send(:include, InstanceMethods) end end Normal Ruby Module Thursday, September 22, 11
70. Clarity Wins Thursday, September 22, 11
71. The Problem is Your Ruby Thursday, September 22, 11
72. The Problem is Your Ruby Rails “expertise” is pointless Focus on Ruby, OO, design Master collections & Enumerable Wrap and reuse code with Modules Favor clarity over brevity Jeff Casimir / @j3 Thursday, September 22, 11