Palestra proferida no Software Freedom Day / SE - 2009

1. Repensando o Desenvolvimento Web com
Ruby on Rails

2. Rails

3. Comunidade

4. Filosofia

5. DanteRegis.com
@danteregis
Admin de Redes - TJ/SE

6. DanteRegis.com
@danteregis
Admin de Redes - TJ/SE
http://slideshare.net/danteregis

7. Você não vai aprender
Ruby on Rails aqui

8. framework

10. David Heinemeier Hansson
2004

11. 37signals

12. 1400+
desenvolvedores

13. jul/2004 0.5
dez/2005 1.0
mar/2006 1.1
jan/2007 1.2
dez/2007 2.0
jun/2008 2.1
nov/2008 2.2
mar/2009 2.3
algum dia (em 2009?) 3.0

14. Empregos
(fonte: indeed.com)

16. MVC

17. opiniated

18. eXtreme Programming

19. TDD

20. REST

21. modularização

22. DRY

23. Convention
over
Configuration

24. KISS

26. script/console

27. Model

28. Model

29. Model

30. Model
id: integer
name: string
price: float
category_id: integer
stock: integer
created_at: datetime
updated_at: datetime

31. Model
id: integer
name: string
x = Product.new
price: float
category_id: integer
stock: integer
created_at: datetime
updated_at: datetime

32. Model
id: integer
name: string
x = Product.new
price: float x.name = "Pão Jacó"
category_id: integer
stock: integer
created_at: datetime
updated_at: datetime

33. Model
id: integer
name: string
x = Product.new
price: float x.name = "Pão Jacó"
category_id: integer x.stock = "100
stock: integer
created_at: datetime
updated_at: datetime

34. Model
id: integer
name: string
x = Product.new
price: float x.name = "Pão Jacó"
category_id: integer x.stock = "100
stock: integer x.price = 0.15
created_at: datetime
updated_at: datetime

35. Model
id: integer
name: string
x = Product.new
price: float x.name = "Pão Jacó"
category_id: integer x.stock = "100
stock: integer x.price = 0.15
created_at: datetime x.save
updated_at: datetime

36. Model

37. Model
INSERT INTO `products` COLUMNS (`name`, `price`,
`stock`) VALUES ("Pão Jaco", 0.15, 100);

38. Model

39. Model
Product.first

40. Model
Product.first
Product.find_all_by_category_id(10)

41. Model
Product.first
Product.find_all_by_category_id(10)
Product.find_or_create_by_name("Margarina")

42. Model
Product.first
Product.find_all_by_category_id(10)
Product.find_or_create_by_name("Margarina")
Product.count

43. Model
Product.first
Product.find_all_by_category_id(10)
Product.find_or_create_by_name("Margarina")
Product.count
Product.average('price')

44. validations

45. associations

46. instance methods

47. Model
class Product < ActiveRecord::Base
end

48. Model
class Product < ActiveRecord::Base
end

49. Model
class Product < ActiveRecord::Base
belongs_to :category
end

50. Model
class Product < ActiveRecord::Base
belongs_to :category
validates_presence_of :name
end

51. Model
class Product < ActiveRecord::Base
belongs_to :category
validates_presence_of :name
validates_numericality_of :stock
end

52. Model
class Product < ActiveRecord::Base
belongs_to :category
validates_presence_of :name
validates_numericality_of :stock
def consume!
stock -= 1
save
end
end

54. p = Product.new(:stock => "xxxxx")

55. p = Product.new(:stock => "xxxxx")
p.save

56. p = Product.new(:stock => "xxxxx")
p.save
#=> false

57. p = Product.first
p.category
p.category.name = "Mudei o nome"
p.category.save

58. has_many

59. class Category < ActiveRecord::Base
has_many :products
end

60. cat.products
cat.products.new
cat.products.first

61. named scope

62. class Product < ActiveRecord::Base
named_scope :low_stock, :conditions => ['stock <= 10']
end

64. Product.low_stock
#=> [.....]

65. Product.low_stock
#=> [.....]
category.products.low_stock
#=> [...]

66. SQL?

67. migrations

68. controle de versão

69. do banco de dados!

70. sem SQL!

72. class AddQuantityToCartProduct < ActiveRecord::Migration

73. class AddQuantityToCartProduct < ActiveRecord::Migration
def self.up
add_column :cart_products, :quantity, :integer
end

74. class AddQuantityToCartProduct < ActiveRecord::Migration
def self.up
add_column :cart_products, :quantity, :integer
end
def self.down
drop_column :cart_products, :quantity
end
end

75. com SQL!

76. > 90%
experiência pessoal

77. ActionController

78. session

79. render

80. filters

81. class ApplicationController < ActionController::Base
before_filter :check_login
def check_login
render :text => "acesso negado!"
end
end

82. flash

83. flash[:notice] = "Você logou no sistema"

84. cookies

85. respond_to

86. ActionView

87. erb

88. haml

89. erb

90. form_tag
form_for

91. <div>
<span><%= flash[:notice] %></span>
</div>
<div>
<% form_tag do %>
<p>
Usuário: <%= text_field_tag 'username' %>
</p>
<p>
Senha: <%= password_field_tag 'password' %>
</p>
<p>
<%= submit_tag 'Entrar' %>
</p>
<% end %>
</div>

92. Tempo para falar mal
de certas “soluções”

93. Fim do tempo para
falar mal de certas
“soluções”

94. Comunidade

95. RailsConf
http://railsconf.com

101. Rails Summit Latin
America
http://railssummit.com.br

102. 13 e 14 de outubro
São Paulo/SP

103. Aldo França

104. Great Blogs ‘n People

105. Akita on Rails
http://akitaonrails.com

106. Carlos Brando
http://nomedojogo.com

107. Ozéias Sant’ana
http://railsbox.org

108. Bruno Miranda
http://brunomiranda.com

109. Ruby Onda
http://rubyonda.com

110. Nando Vieira
http://simplesideias.com.br

111. PeepCode
http://peepcode.com

112. RailsCasts
http://railscasts.com

113. http://slideshare.net/danteregis

114. dante@danteregis.com