The document provides an overview of Ruby on Rails, including its principles, building blocks, caching, security, and community support. It discusses how Rails enables rapid application development through conventions over configurations, and the don't repeat yourself principle. Key components like Active Record and different caching techniques are explained. The document also highlights various databases, platforms, and tools that support Ruby on Rails development.

1. puts 'hello ruby on rails'
by amol.pujari
Why should you switch to Ruby? If you are happy with Perl or Python, you don't
have to. But if you do feel there must be a better language, Ruby may be your
language of choice. Learning a new language is harmless. It gives you new
ideas and insights. You don't have to switch, just learn and try it. You may find
yourself comfortable enough with Ruby to decide to switch to it.
- Matz (Yukihiro Matsumoto), written ruby in 1995

2. Agenda.items.each {|item| puts item}

RoR - Market Trend

Know ruby

Principles

Features

Ruby on rails

Principles

Building blocks

Caching

Security

Community Support

3. Market Trend - Need for Ruby on Rails

Less “Time To Market”

Quick to build & deploy

Its free

Rapid application development

Handle traffic – when needed

Huge free libraries with strong community support

4. Who is using Ruby on Rails

5. Ruby on Rails – Todays world

Visits/sec

twitter 642

scribd 940
1041

blingee 1170 1621
327

yellowpages 1734

penny-arcade 2069
78

43things 4190
232

kongregate 4488
158

potchforkmedia 4740

projectpath 5041
Around 4000 companies have RubyOnRails

funnyordie 5089 adopted in last 4 years

6. So what is Ruby..?

7. Ruby

A scripting language

Purely Object Oriented

Extreme dynamic

Easy to learn, simple

Influenced by Python, Perl and Lisp

Open source and free

Cross Platform

8. Ruby - Programming is fun, enjoy it

You don't want to fight with the language, feel natural

Be creative

9. Ruby - concise and succinct

Concentrate on the problems

Its like pseudo-code, simple

Focus on human factor

10. Ruby - extreme dynamic

eval, meta-programming, reflection, Open Classes

11. Ruby - features

Dynamic yet strong typing

Regular expressions, symbols, mutable strings

Blocks, Iterators, generators

Collections, arrays, hashes

Interpolation, default arguments

Operator overloading

exception handling

Native threads

Custom dispatch behavior (method_missing)

Garbage collection

12. if you want to try out all these examples given then
download ruby from http://www.ruby-lang.org/en/downloads/
open console, type irb, and enter
have fun …
end
# so simple
often my code requires no comments - amol.pujari

13. ruby on rails
extracted by David Heinemeier Hansson from his work on Basecamp, a project
management tool by 37signals

14. Ruby on Rails: Rapid application development

Web application framework

Free

Very less code

Fast development & client appreciation

Quick incremental development model

Multiple Databases support

Testing support

Continues Integration support

Deployment support

Cloud ready solution

15. Ruby on Rails: Principles - CoC

Conventions Over Configurations

Database table name: books { id(pk), created_at, updated_at }:unicode

Database migration: app/db/migrate/<ts>_create_books.rb

Model: class Book => app/models/book.rb

Views: app/views/books/

Controller: class BooksController => app/controllers/books_controller.rb

Unit tests: app/test/unit/book_test.rb

Fixtures: app/test/fixtures/books.yml

Functional tests: test/functional/books_controller_test.rb

Routes: resources :books =>

16. Ruby on Rails: Principles - DRY

Don't Repeat Yourself

17. Rails: building blocks

ORM: Active Record

Action Pack

Action Dispatch

Action Controller

Action View

Active Support

Active Model, Active Resource, Action Mailer

Railties

18. Rails: Active Record

CRUD support  migrations

Model level validations  Associations

Callbacks  Query interface

19. Rails: Active Record: Association

20. Rails: Active Record: Association

21. Rails: inbuilt caching

SQL Caching

caches_page :index

caches_action :index

Fragment caching => <% cache do %> ...<% end %>

ActiveSupport::Cache::Store
config.cache_store = :memory_store
# :FileStore, :mem_cache_store, :redis,

22. Rails: Security

Session Hijacking

Stealing a user’s session_id

Use database store and SSL

Session Fixation

Attacker fixes a session id known to her

Issue a new session identifier (reset_session in RAILS)

Cross-Site Request Forgery (CSRF)

Rails includes a security token in non-GET requests

SQL Injection

Unauthorized reading/writing

Model.first(:conditions => ["login = ? AND password = ?",
entered_user_name, entered_password])

attr_protected :is_admin

HTML/JavaScript Injection

h @book.description # => 'alert('script inside');'

23. Ruby on Rails – wider support

Databases  Development 
Performance  Security

Ibm db2  Neatbeans 
J-meter  Md5, Kerberos

Oracle  Apatana 
Yslow, Firebug  Sha1, Sha2

MsSql  Eclipse 
Five-runs  Platforms

Mysql  Radrails 
New-relic  All flavors of linux

Postgres  Project Management 
Http-perf  Windows, MS DOS, Mac

Sqlite  Redmine

Memcache, redis  CMS

Mongodb  Trac

Apache benchmark  Wordpress, Mephisto

Cassandra  Basecamp

Standards  Comatoes, Radiant

BerkleyDB  Spring loop 
XML/REST  spree

UI  Assembla 
MVC/ORM  Testing

HTML 5  Repositories 
Deployment  Cuccumber, Rspec

Flash  Svn, cvs 
Apache  Factory-girl, selenium

Flex  Github 
NGINX  Flavors

Scripts  Mercurial 
Mongrel  Jruby

Ajax  Visual Source Safe 
Glassfish  Iron ruby

Jquery  Continues Integration 
phusion-passanger  Rubinies

Prototype  Capistrano

WebSphere  Ruby shoes

Css 3  Cruise Control

Rack  Sinatara

Coffeescript  moonshine

metal  Merb

24. Thanks. :)
any queries?