The document contains a variety of Ruby on Rails code snippets, examples, and concepts related to ActiveRecord and API usage, addressing functionalities like associations, validations, and CRUD operations. It discusses the implementation of modules, mix-ins, and methods in Ruby while providing context in relation to Java. Additionally, it references resources, plugins, and various coding patterns within the Ruby on Rails framework.

1. Ruby on Rails
y.ohba@everyleaf.com

2. ... → C++ → Java(7 ) → Ruby(1.5 )
Award on Rails 2006

3. orz

5. Award on Rails 2006
• Web
•
•
http://www.kozuchi.net

6. Ruby on Rails 100%
EC
SNS

7. Ruby on Rails
http://www.everyleaf.com

8. Ruby on Rails
/

9. Ruby on Rails
Java

10. Hello, RoR
Scaffold
CRUD
Session, Request

11. Rails
Ruby
etc...

12. API
Rails , Plugin
Ruby

13. REST Hash Array
ActiveRecord
Module Mix-in DRY
Ajax
Plugin

14. - IDE, SVN, Trac, Wiki, UML

16. Java Ruby
0
||=
Hash Array

17. Ruby - 0
s=0
if s
p "0 "
end
nil false
0

18. nil
if value != nil
...
if value
...
unless value.nil?
...

19. 1
if !id
raise "no id"
end
Java
raise "no id" if !id
raise "no id" unless id
unless

20. Hash Array
API

21. Hash
hash = {key => value, key => value, ...}
value = hash[key]
obj.foo( {key => value, key => value} )
obj.foo(key => value, key => value)
{}

22. Array
admin= nil
for element in @array
if element.name == "admin"
admin = element
break
end
end
admin = @array.detect{|e| e.name == "admin" }

23. public, protected, private Java
Module

24. ||=
name ||= " "
name = name || " "
ex) value += 1

25. private, protected, public
Ruby
private
Java
Ruby
protected
Java
Java
public
Ruby
Java

26. Ruby
Java

27. item.save
item
self.save
self
save
private

28. RoR
- public
- private
protected
ActiveRecord

29. class Foo
def self.foo
p ‘foo’
end
end
> Foo.foo
> f = Foo.new
> f.class.foo

30. ActiveRecord

31. :joins :include

32. Acts as List

33. class
table
class class

35. Item, Book, Dvd
items
Item
items
Book Dvd

36. type

37. type
items
Item
type: varchar(30) "Book"
Book Dvd
type

38. Employee belongs_to :work_place

39. has_many :employees
has_one :employee
employees Employee Office offices
office_id
belongs_to :office

40. has_many :employees, :as => work_place
Office offices
work_place_id
work_place_type
employe Work
es Employee Place Factory factories
belongs_to :work_place, :polymorphic => true

41. work_place_id,
work_place_type
xxx_id, xxx_type xxx
id type( )
xxx_type
has_many :through

42. (xxx_)type
→ Up

43. ActiveRecord
Save

44. #
def after_update
children.each {|c| c.save!}
end

45. -
Controller
Model
Rails API

46. :joins :include
employees = Employee.find(:all,
:select => "employee.*",
:conditions => ["offices.prefectue_id = ?",
prefecture_id],
:joins => "left join offices on
employees.office_id = offices.id")
:joins SQL join

47. :joins :include (2)
class Employee < ActiveRecord::Base
belongs_to :office
end
employee = Employee.find(@id,
:include => :office)

48. Rails API
validates_presence_of etc...
= errors
def validate
errors.add_to_base(“ ”) unless quantity % 2 == 0
end

49. API
:scope, :allow_nil
ActiveHeart Plugin
GetText , Scpecial Generator

50. Acts as List
has_many

51. Acts as List
position
class Note < ActiveRecord::Base
has_many :lines, :order => "position"
end
class Line < ActiveRecord::Base
belongs_to :note rails 2.0
acts_as_list :scope => :note
end

52. has_many
)

53. class Employee < ActiveRecord::Base
belongs_to :office, :counter_cache => true
end
★offices employees_count
★ 0

54. ActiveRecord
API
Association (has_many
)
http://api.rubyonrails.org/

55. REST
Controller URL
entries/new_comment/1
entries/1/comments/new
entries/1/comments/3

56. REST
Controller
routes.rb
Filter
@book

57. rails 2.0
REST

59. acts_as_authenticated plugin
before_filter
before_filter :load_user
private
def load_user
@user = User.find(session[:user_id])
end

60. @entries = Entry.secure_find(@user, options)

61. create save
update
validates_association
:dependent => :destroy

62. acts_as_paranoid

63. file_column
RMagick
I/F

64. GetText (gem
)
Globalize

65. acts_as_taggable
SpecialGenerator
Scaffold

66. Rails

67. Ruby DSL
DSL =
has_many :employees
AR
Rails
= DSL

68. String
under_score, pluralize ...
acts_as_paranoid

69. Module Mix-in

70. Java
Ruby
class Object
def yeah
p ‘yeah!’
end
end

71. Module Mix-in
Module
module Human
def age(date)
# ( )
end
end
include
class Employee < ActiveRecord::Base
include Human
end

72. /
ActiveRecord::Base
Office Factory Module
include include
WorkPlace

73. include
module WorkPlace
#
def self.included(base)
base.has_many :employees,
:as => :work_place
end
end

74. Module
module WorkPlace
module ClassMethods
def foo
p ‘foo’
end
end
def self.included(base)
base.extend(ClassMethods)
end
end

75. private
obj.__send__(:himitsu)
※Ruby1.9

76. clazz.__send__(:define_method, :yeah) {
p ‘yeah!’
}

77. (^o^)/

78. init.rb
Module include
→ DSL
) acts_as_paranoid

79. Module Helper
DSL

83. What

84. (^o^)/

85. Ruby on Rails

87. Award on rails 2007
BookScope
http://ko.meadowy.net/bookscope/

88. BookScope
Amazon WebService
.org

89. 10/19( ) !!
http://rails.drecom.jp/vote
BookScope
m(_ _)m