Ruby on Rails

1
Ruby on Rails

• Web Development that Doesnt Hurt

Brattleboro Tech Collective Marlboro College Grad
Center February 18, 2006
2
Ruby on Rails Web Development that Doesnt Hurt

• Introduction
• Demo Application
• Q A

3

• Collectively owned and operated
• Web site development
• We specialize in Web applications

4
Brattleboro Tech Collective

• Open Source Content Management System
• Shopping Carts and Order Processing
• Book Publishing Software
• Class/Training Registration System

5
Evolution of Web Applications
6
CGI

• server-side applications

7
CGI and server-side applications

• Escaped HTML is in the code
• Difficult to organize, difficult to
• maintain.

8
inline code code is embedded into HTML

• Examples
• PHP
• embedded Perl
• JSP
• ASP
• ColdFusion

9
inline code

• Difficult to separate display logic from
  application logic
• Difficult to build large applications

10
separation of logic and presentation
11
Model, View, Controller (MVC)

• an architecture to separate logic from
  presentation

Used by Ruby on Rails (also used by Java on
Struts)
12
Model

• data, usually held in a database

13
View

• how things are presented to the user (HTML and
  CSS, user interface)

14
Controller

• code and business logic, controls the interaction
  between the View and the Model

15
(No Transcript)
16
Ruby

• programming language
• released in 1995 in Japan by Yukihiro Matsumoto

17
Ruby

• Open Source
• Highly object-oriented
• Focuses on the needs of the programmer, not the
  needs of the machine
• syntax similar to Perl

18
Ruby syntax

• def add_poodle
• _at_poodle Poodle.new(paramspoodle)
• _at_poodle.owner Owner.find(paramsid)
• _at_poodle.save
• render(partial gt 'poodle', layout gt
  false)
• end

19
Rails

• open source web applications framework
• originally written to develop Basecamp
• released in 2004 by 37 Signals

20
Basecamp by 37 Signals
21
Tadalist and Backpack by 37 Signals
22
Typo
23
Odeo
24
43 Things
25
Framework

• support structure in which other applications can
  be developed
• Rails is an MVC framework

26
Advantages of Rails

• Rails handles the tedious and routine structures
  so the programmer can focus on actual programming
• Scaffold the initial Create/Read/Update/Delete
  system (CRUD)
• Automatic form validation
• Automatic setup for application testing

27
Rails integrates well with AJAX

• Asynchronous Javascript and XML
• AJAX is not a technology, it is a technique
• AJAX is a way to exchange data with the server
  without having to reload the entire web page

28
Case Study Poodle Influenza

• Your company has won a bid by the CDC
  (Center for Disease Control and Prevention) and
  the AKC (American Kennel Club) to help develop a
  poodle tracking application to help poodle owners
  register their precious pets in a national
  database. The data from this application will
  become part of the EDSRN (Emergency Dog Show
  Relief Network.)
• The application will be used to collect info
  over the web about the owners and the individual
  poodles they own. Data from the application will
  be used to determine poodle distributions around
  the country and help computer simulations
  determine likely outcomes of a poodle pandemic
  and to calculate the possible economic
  repercussions on the dog show industry.

29
Case Study Poodle Influenza

• Data Structure Poodles and Owners
• Must CRUD (Create/Read/Update/Delete)
• Focuses on the needs of the programmer, not the
  needs of the machine

30
(end of slideshow)
Brattleboro Tech Collective Marlboro College Grad
Center February 18, 2006