Ruby on Rails : 簡介與入門

Ruby on Rails Part1: ihower@gmail.com http://creativecommons.org/licenses/by-nc/2.5/tw/

• (a.k.a ihower) http://ihower.idv.tw/blog/

• (a.k.a ihower) http://ihower.idv.tw/blog/ • http://handlino.com

Rails? • ( MIT ) Web database-backed • MVC (Model-View-Control ) • ( ) Ruby Ajax ORM (object-relational-mapping) • 2004 David Heinemeier Hanson(DHH) 37signals

• Ruby • Don’t Repeat Yourself (DRY) • • • Convention Over Conﬁguration • •

Ruby on Rails ? • ( ) • ( Joomla Durpal CMS •

Rails • 2005 DHH Hacker • 2006 Rails Jolt • 2005~2006 Ruby/Rails 1552% • Ruby Tiobe 26 10

Rails ? Java(Spring/Hibernate) Rails 4 20 4 ( 5 ) 3293 1164 1161 113 / 62/549 55/126 Justin Gehtland Java Rails

Rails ? • Justin Gehtland Java :Rails = 3.5 : 1 • Proc.net PHP : Rails = 10 : 1 • JavaEye JAVA : Rails = 10 : 1 • thegiive PHP : Rails = 8 : 1

Rails clone

Rails ? M V C MVC Model-View-Control

DB schema Ruby class CreatePeople < ActiveRecord::Migration def self.up create_table :people do |t| t.string :name t.integer :age t.date :birthday t.text :bio t.timestamps end end def self.down drop_table :people end end

Active Record ORM class Person < ActiveRecord::Base # end person = Person.new person.name "ihower" person.age = 18 person.save person = Person.find(1) puts person.name # ihower

Action Controller HTTP request class PeopleController < ApplicationController # GET /people def index @people = Person.all end end

Action Controller HTTP request class PeopleController < ApplicationController method action # GET /people def index @people = Person.all end end

Action Controller HTTP request class PeopleController < ApplicationController method action # GET /people def index @people = Person.all end instance variable end View

Action View Ruby HTML <html> <body> <h1>Guestbook</h1> <% @people.each do |person| %> <p><%= person.name %>: <%= person.bio %></p> <% end %> </body> </html>

Why Rails? • • • (prototyping) • •

Because Rails is ... • MVC • (Ajax RESTful ) • • • • Ruby ( ) • ActiveRecord ORM • Migration • (DRY)

Thank you. Get to the Point! (http://johnwlong.com/slides/gettothepoint/) Ruby on Rails slide by thegiive in COSCUP Delivery of the key adoption Factors and key characteristics of companies using ruby on rails by Michel Barbosa

Ruby on Rails Part2: ihower@gmail.com http://creativecommons.org/licenses/by-nc/2.5/tw/

README • http://ihower.idv.tw/blog/archives/1743 • http://ihower.idv.tw/course/rails.html

Web framework? • • Perl CGI PHP ASP MVC Database URL Template Cookie Ajax .... • Framework Framework

MVC? • Model Controller View • Model • • View • Ruby HTML • Controller Model • (e.g. ) Request Model View (e.g. HTML)

1. Controller 2. 3. 4. View Model DB

Rails MVC? Routing 1. 2. ActionController 4. 3. 5. ActionView ActiveRecord DB

MVC? • • (DRY: Don’t repeat yourself) •

Ruby on Rails • Ruby 1.8.6 1.8.7 • Rubygems (Ruby ) • Rails SQLite 3 MySQL Postgres Oracle DB2 MSSQL

Rails Hello World!(live demo & )

(Routes) http://localhost:3000/welcome/say Controller Action # /config/routes.rb map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format'

Model (live demo)

ORM ? • ActiveRecord Rails ORM • ORM: Object-Relational Mapping • (table) (classe) • • (row) (object) • • (column) (object attribute)

script/console ORM ( )

script/* ? • script/about • script/console • script/generate • script/server • script/plugin

Rake? • Make Ruby • # lib/tasks/my_task.rake namespace :my desc "task description" task :foo_task => :environment do puts “foobarrrr” end end rake my:foo_task

Rake ? • rake -T • rake db:migrate • rake db:drop • rake tmp:clear • rake notes

DB Migration? • Ruby (Schema) • • e.g. ?? • • e.g. SQLite3 MySQL Postgres...etc • Migration

Rails • app • log • controllers • public • helpers • script • models • test • views • tmp • conﬁg • vendor • db • doc • lib

Rails environments • development, production, test mode • • Log level Session store, custom library, Email setting • environment

controller view (live demo & )

Helper ? • view template helper method • link_to • form_for •h (XSS ) • /app/helpers/* Helper

Layout (live demo & ) • View Layout HTML • /app/views/layouts/application.html.erb

ﬂash hash (live demo & ) • ﬂash hash redirect action •

DRY: Partial template (live demo & ) • View •

DRY: before_ﬁlter (live demo & ) • Controller • ID Model

Model Validation (live demo & ) • post.rb validates_presence_of :title • new.html.erb edit.html.erb <%= error_messages_for :post %> helper

Thank you. Agile Web Development with Rails 3rd. RailsGuides http://guides.rubyonrails.org

Ruby on Rails : 簡介與入門

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