Por que Rails?

Transcript

1. Por que Rails? !
2. Por que Rails? !
3. Software Engineer github.com/marceloboeira twitter.com/marceloboeira_ " # $ medium.com/@marceloboeira Porto Alegre MARCELO BOEIRA
4. Por que Rails? !
5. maturidade
6. I believe people want to express themselves when they program. They don't want to fight with the language. Programming languages must feel natural to programmers. 1994 Yukihiro Matsumoto (Matz) ruby
7. I wanted a script language that was more powerful than Perl, and more object- oriented than Python Perl Python Smalltalk Lisp
8. 2004 Rails is an open-source web framework that is optimised for programmer happiness and productivity. David Heinemeier Hansen DHH rails
9. quem usa ?
10. simplicidade
11. DRY
12. Don’t Repeat Yourself
13. SRP
14. Single Responsibility Principle
15. CoC
16. Convention Over Configuration
18. comunidade
19. open source
20. https://github.com/rails/rails % & ' 2,800 13,818 commits contributors pull-requests 52,788
21. gems
23. authorization authentication pagination background processing devise cancan kaminari sidekiq resque testing rspec
24. https://rubygems.org/stats ( ! ) 106,442 93,277 downloads gems users 5,852,265,072
25. produtividade
26. coding-generation
27. workflow
28. mvc
29. MVC
30. active_record
31. asset-pipeline
32. i18n
33. mantenabilidade
34. changing
35. testing
37. obrigado!!
38. fim!
39. module SoftDelete attr_reader :deleted_at 
 def delete! self.deleted_at = Time.now end def deleted? self.deleted_at.present? end def recover! self.deleted_at = nil end end class User include SoftDelete def initialize(name) @name = name end end class Post include SoftDelete def initialize(title) @title = title end end
40. $ post = Post.new(“Example”) $ post.deleted? false $ post.delete! $ post.deleted? true $ post.deleted_at 2015-08-24 23:11:37 -0300 $ post.recover! post.deleted? false $ u = User.new(“Marcelo”) $ user.deleted? false $ user.delete! $ user.deleted? true $ user.deleted_at 2015-08-24 23:13:38 -0300 $ user.recover! p.deleted? false
41. Alan Kays Everything is an Object
42. Fixnum String Array Hash 1, 2, 3 “foo” [1, “foo”, 3, “bar”] { foo: “bar” } Nil TrueClass nil true
43. Alan Kays Everything is an Object
44. Alan Kays Everything is an Object Objects communicate by sending and receiving messages
45. Numeric 1 + 1 1.+ 1 1.+(1) 1.send(:+, 1)
46. Alan Kays Everything is an Object Objects communicate by sending and receiving messages
47. Alan Kays Everything is an Object Objects communicate by sending and receiving messages Every object is an instance of a class
48. true.class false.class 1.class “foo”.class => TrueClass => TrueClass => Fixnum => String [].class => Array
49. Alan Kays Everything is an Object Objects communicate by sending and receiving messages Every object is an instance of a class
50. Alan Kays Everything is an Object Objects communicate by sending and receiving messages Every object is an instance of a class Objects have their own memory, which consists of other objects.
51. class User attr_accessor :name def initialize(name) @name = name end end $ alan = User.new(“Alan”) $ alan.name => “Alan” $ alan.name.class => String
52. Alan Kays Everything is an Object Objects communicate by sending and receiving messages Every object is an instance of a class Objects have their own memory, which consists of other objects.
53. Alan Kays Everything is an Object Objects communicate by sending and receiving messages Every object is an instance of a class Objects have their own memory, which consists of other objects. The class is the repository for behavior associated with an object.
54. class User attr_accessor :name … def initials @name.split(“ “).map(&:chr) end end $ alan = User.new(“Alan Kays”) $ alan.initials => [“A”, K”]