11/26 (株)ウェブキャリア セミナー資料 DLはこちらからどうぞ http://ko.meadowy.net/~nay/ruby/2007/seminar_ohba_2007_11_26-1.pdf

1. Rails
2007.11.26
y.ohba@everyleaf.com

2. ... C++ Java(7 ) Ruby(1.5 )
Perl CGI, EJB, Servlet/JSP (Struts)

3. orz

4. Ruby on Rails
Java
Ruby on Rails

5. Ruby on Rails (^0^)/

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

7. Ruby on Rails 100%
EC
SNS

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

9. Award on rails 2007
BookScope
http://bookscope.net/

10. BookScope
Amazon WebService
.org

11. Ruby on Rails
/

12. Ruby on Rails
Ruby on Rails

13. Hello, RoR
Scaffold
CRUD
Session, Request

14. Rails
Ruby
etc...

15. API
Rails , Plugin
Ruby

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

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

19. Ruby
Java
0
||=
Hash Array

20. Ruby - 0
s=0
if s
p quot;0 quot;
end
nil false
0

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

22. 1
if !id
raise quot;no idquot;
end
Java
raise quot;no idquot; if !id
raise quot;no idquot; unless id
unless

23. Hash Array
API

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

25. Array
admin= nil
for element in @array
if element.name == quot;adminquot;
admin = element
break
end
end
admin = @array.detect{|e| e.name == quot;adminquot; }

26. public, protected, private Java
Module

27. ||=
name ||= quot; quot;
name || name = quot; quot;
ex) value += 1

28. private, protected, public
Ruby
private
Java
Ruby
protected
Java
Java
Ruby
public
Java

29. private
item.my_private_method
self.my_private_method
private
my_private_method
private

30. Ruby

31. RoR
- public
- private
protected
ActiveRecord

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

33. ActiveRecord

34. :joins :include

35. Acts as List

36. ActiveRecord
O/R
RDB
ActiveRecord
“ ”

37. ActiveRecord
table class
users User
user
(id = 1, name = ‘ ’)

38. class
table
class class

39. (1)
Item, Book, Dvd
items
Item
items
Book Dvd

40. Item.find(:all, :order => ‘created_at desc’)
DVD,
Book.find(:all, :order => ‘created_at desc’)

41. type

42. type
items
Item
type: varchar(30) quot;Bookquot;
Book Dvd
type

43. (2)
Manager Developer
ProjectMember
project_members class
table
class class
Developer Manager

44. item_type role
if

45. Polymorphic Association

46. (Association)
=
(= )
belongs_to
has_one
has_many

47. belongs_to
Employee Office offices
employees
office_id
belongs_to :office
class Employee < ActiveRecord::Base
belongs_to :office
end
belongs_to( )

48. Controller Employee
@employee = Employee.find(params[:id])
View
<table>
<tr>
<th> </th>
<td><%= @employee.office.name %></td>
</tr>
</table>

49. has_one
has_one :head
Employee Office offices
employees
office_id
class Office < ActiveRecord::Base
has_one :head, :class_name => ‘Employee’,
:conditions => “head = 1”
end
has_xxx ( )

50. has_many
has_many :employees
Employee Office offices
employees
office_id
class Office < ActiveRecord::Base
has_many :employees
end
has_one has_many

51. has_many
Controller office
@office = Office.find(params[:id])
View
<% for e in @office.employees -%>
<div><%= e.name %></div>
<% end ->

53. Office offices
Employee
employees
Factory factories
Employee Office Factory

54. ...
class Employee < ActiveRecord::Base
belongs_to :office
belongs_to :factory
end
<% if @employee.office %>
<%= @employee.office.name %>
<% else -%>
<%= @employee.factory.name %>
<% end -%>

55. class Employee < ActiveRecord::Base
belongs_to :workplace
end
Office Factory WorkpPlace
<%= @employee.workplace.name %>

56. has_many :employees
has_one :head
Employee Office offices
employees
office_id
belongs_to :office

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

58. (xxx_type )

59. class Employee < ActiveRecord::Base
belongs_to :work_place, :polymorphic => true
end
class Office < ActiveRecord::Base
has_many :employees, :as => :work_place
end
class Factory < ActiveRecord::Base
has_many :employees, :as => :work_place
end

60. work_place_id,
work_place_type
xxx_id, xxx_type xxx
xxx_type SQL
conditions
ActiveRecord

62. Comment
comments
commentable_id
commentable_type

63. class Item < ActiveRecord::Base
has_many :comments, :as => :commentable
end
@item.comments.create(:body => ‘ ’)

64. (xxx_)type
Up

65. ActiveRecord
Save

66. #
def after_update
children.each {|c| c.save!}
end

67. before_validation
after_destroy

68. -
Controller
Model
Rails API

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

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

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

72. if @employee.save
flash[:notice] = ‘ ’
redirect_to :action => ‘index’
else
render :action => ‘new’
end
Controller save
<%= error_messages_for ‘employee’ %>
View

73. API
API
ActiveHeart Plugin
GetText , Scpecial Generator

74. Acts as List
has_many

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

76. has_many
)

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

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

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

80. REST
Controller
routes.rb
Filter
@book

81. rails 2.0
REST

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

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

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

86. acts_as_paranoid

87. file_column
RMagick
I/F

88. GetText (gem
)
Globalize

89. acts_as_taggable
SpecialGenerator
Scaffold

90. Rails

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

92. String
under_score, pluralize ...
acts_as_paranoid

93. Module Mix-in

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

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

96. ActiveRecord::Base
Module
Office Factory
include include
WorkPlace

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

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

99. private
obj.__send__(:himitsu)
Ruby1.9

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

101. (^o^)/

102. init.rb
Module
include
DSL
) acts_as_paranoid

103. NULL
email
def email=(value)
value = nil if value.blank?
self[:email] = value
end

104. class User < ActiveRecord::Base
nullify_blank :email, :address, :tel, :fax, :url
end

105. vendor/plugins/my_extension/init.rb
class ActiveRecord::Base
def self.nullify_blank(*args)
args.each do |attr|
define_method(:quot;#{attr.to_s}=quot;) do |v|
v = nil if v.blank?
self[attr.to_sym] = v
end
end
end
end

106. Module Helper
DSL