Ruby on Rails 中級者を目指して - 大場寧子

Ruby on Rails y.ohba@everyleaf.com

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

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

Ruby on Rails 100% EC SNS

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

Ruby on Rails /

Ruby on Rails Java

Hello, RoR Scaffold CRUD Session, Request

Rails Ruby etc...

API Rails , Plugin Ruby

REST Hash Array ActiveRecord Module Mix-in DRY Ajax Plugin

- IDE, SVN, Trac, Wiki, UML

Java Ruby 0 ||= Hash Array

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

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

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

Hash Array API

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

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

public, protected, private Java Module

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

private, protected, public Ruby private Java Ruby protected Java Java public Ruby   Java

Ruby Java

item.save item self.save self save private

RoR - public - private protected ActiveRecord

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

ActiveRecord

:joins :include

Acts as List

class table class class

Item, Book, Dvd items Item items Book Dvd

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

Employee belongs_to :work_place

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

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

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

(xxx_)type → Up

ActiveRecord Save

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

- Controller Model Rails API

: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

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

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

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

Acts as List has_many

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

has_many )

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

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

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

REST Controller routes.rb Filter @book

rails 2.0 REST

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

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

create save update validates_association :dependent => :destroy

acts_as_paranoid

ﬁle_column RMagick I/F

GetText (gem ) Globalize

acts_as_taggable SpecialGenerator Scaffold

Ruby DSL DSL = has_many :employees AR Rails = DSL

String under_score, pluralize ... acts_as_paranoid

Module Mix-in

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

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

/ ActiveRecord::Base Ofﬁce Factory Module include include WorkPlace

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

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

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

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

(^o^)/

init.rb Module include → DSL ) acts_as_paranoid

Module Helper DSL

(^o^)/

Ruby on Rails

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

BookScope Amazon WebService .org

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

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Ruby on Rails 中級者を目指して - 大場寧子

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