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博文链接：https://thinking80s.iteye.com/blog/424942Ruby on Rails 2.
WHATS NEW
Second edition
Ruby on Rails 2.
WHATS NEW
Second edition
Carlos brando
Marcos Tapajos
o Copyright 2008 Carlos Brando. All Rights reserved
Second edition: June 2008
Carlos brando
Websitewww.nomedojogo.com
Marcos tapajos
Websitewww.improveit.combr/en/company/tapajos
Chapter I: Introduction
Chapter I
Introduction
Around July of 2004 David Heinemeier Hansson publicly released the ruby on rails framework, which had been extracted
from a web application called Basecamp More than three years later, on the December 7th, 2007 Ruby on rails version
2.0 was released with numerous important changes
Six months have passed since then and during this time more than 400 developers from all around the world have
contributed 1 600 patches to the framework. Today, June I st 2008, version 2. I of the Ruby on Rails framework was
release
Major new features according to David
Timezones
Dirty tracki
· Gem Dependencies
Named scope
Ruby on rails 2. 1 -What's New
· UTC-based migrations
Better caching
As always, to update or install the new version
gem install rails
ACKNOWLEDGMENT
To Marcos Tapajos, co-author of this book. If it wasn't for him, you probably you wouldn't be reading this right now
To Daniel Lopes who made the beautiful cover for this edition
To all of the Ruby on Rails Brazilian community that helped directly or indirectly with this book, commenting on blog posts
and giving suggestions. It's like I always say, the best of rails is its community! Keep creating, inventing, and specially
sharing
TRANSLATORS
This book was proudly translated to english by these brazilian guys
PedroPimentel-http://www.pedropimentel.co
Chapters 3-8 and 10-13
RafaelBarbosa-http://www.act-as-newbie.com
Chapter I: Introduction
Introduction and chapter l
Ricardosyasuda-http:blog.shadowmaru.org
Chapter 1 4
CaikeSouza-http://tech-death.blogspot.com
Chapter 2
Abraaocoelho-http://abrcoelho.net
Chapter 9
BrunoMiranda-http:/brunomiranda.com
R
Ruby on rails 2. 1 -What's New
Chapter 2
ActiveRecord
ActiveRecord is an object-relational mapping layer responsible for the interoperability among application and database and
also responsible for data abstraction(wikipedia)
THE SUM METHOD
Expressions in the sum method
Now we can use expressions in Activerecord methods that deal with calculation like sum, for example
Person sum( 2 age
0
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