Rails 3 is out

An important day for the ruby on rails community!

Intro video

New features

Viewing the screencasts we see some nice features built into rails 3:

Refactored Internals: a minimal functional core vs. extended functionality.
Rails3 has a microkernel architecture with additional libraries.
New/cleaner routing structure which is rack compatible. Rack basically entails a simple interface for handling HTTP requests in Ruby. Rails Metal, one of the results of the move to Rack, provides a way to bypass some of the normal overhead of the Rails stack, allowing a developer to specify certain routes and code to execute when those routes are hit (see Rack support in Rails: Why It Matters)
ActiveRelation: new syntax for queries, for example the much shorter Post.where(:published => true) is a clean example of querying your data source.
Rails 3 ships with Bundler, a Ruby library that makes Dependency Management less painless because dependencies are better dealt with than Gems (see nice graphical illustration in the screencasts)
ActionMailer has its own app/mailers folder and has (among a lot of other cool stuff) automatic mime-type detection
Cross-site scripting (XSS) protection is offered by automatic string escaping / cross-site request forgery is prevented by protect_from_forgery
Unobtrusive javascript (UJS)
- HTML5 custom data attributes (data-* tags) are integrated saving a lot of markup (instead of a crap-load of html, just one data-..=”..” tag).
- Support for more JS frameworks. You can easily integrate jQuery by getting the jquery ujs driver

More info

New features: http://weblog.rubyonrails.org/
Release notes rails3 can be found here
To begin with: get started guide
Some amazing screencasts
Even more documentation

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