Rails 3 : Cool New Things

Rails 3 Cool New Things

* Caveats

Not ready... ● 3.0pre not released yet ● http://oscardelben.com/articles/2009/12/06/how totestrails3.html

On to Cool Stuff...

Have It Your Way

More modular ● Standard Rails will work out of the box ● Swap AR with DataMapper ● http://www.slideshare.net/mattetti/rails3 steppingoffofthegoldenpath

ActionController ● Based on Metal ● Swap out stuff you don't need for performance ● http://www.engineyard.com/blog/2010/railsand merbmergepluginapipart3of6/

ActiveRecord & Arel

Arel ● compose queries using relational algreba ( http://github.com/rails/arel) ● Lazy loading in 3.1 (http://m.onkey.org/2010/1/22/activerecord queryinterface)

Arel http://m.onkey.org/2010/1/22/activerecordqueryinterface

Responders ● respond_to now baked in ● Can make your own responders ● http://weblog.rubyonrails.org/2009/8/31/three reasonsloveresponder

http://www.engineyard.com/blog/2009/myfivefavoritethingsaboutrails3/

New Gem Bundler

Bundler ● No more config.gem ● Gemfile ● Evaluates all dependencies at once ● Deploying and freezing native gems ! ● http://github.com/wycats/bundler

Gemfile

Config files * ● config/environment.rb shrunk ● New file : config/application.rb ● Application name seems to matter now (https://rails.lighthouseapp.com/projects/8994/ti ckets/3556app_generatorshoulddisallowor fixinvalidapp_const)

config/environment.rb

config/application.rb

config/boot.rb

Routing More power to the people

Routing ● More flexible ● Can point to any Rack application ● “main#home == MainController.action(:home) == a Rack application” ● http://yehudakatz.com/2009/12/26/therails3 routerrackitup/

Routing

ActionMailer ● Looks more like a Controller now ● http://gist.github.com/281420

ActionMailer http://gist.github.com/281420

Javascript

Javascript ● Unobtrusive ● Easier to swap out with Jquery ● Uses HTML5 data* attributes

Javascript

Plugins

Plugins ● rspec http://github.com/dchelimsky/rspec rails/tree/rails3 ● cucumber http://blazingcloud.net/2010/01/17/notesfrom rails3bugmash ● Others http://wiki.rubyonrails.org/rails/version3/plugins_ and_gems

By the Way....

ActiveModel Get Validations, etc by including ActiveModel::Validations

Rails::Subscriber ● Get hooks for notifications, etc. ● E.g. Output ActiveRecord SQL to Growl ● http://hasmanyquestions.wordpress.com/2010/0 1/17/letyoursqlgrowlinrails3/

XSS protection ● eRB now escaped by default ● Use raw to not escape ● Try out the plugin http://github.com/NZKoz/rails_xss

Starters ● http://omgbloglol.com/post/344792822/thepath torails3introduction ● http://www.engineyard.com/blog/2009/myfive favoritethingsaboutrails3/ ● http://rails3.community tracker.com/permalinks/5/notesfromthefield upgradingtorails3

http://www.caiwangqin.com	567
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Rails 3 : Cool New Things

by Y. Thong Kuah

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