• Rails
2.0 Preview Release
• 1.2.4
• 2.0
•

Behold, behold, Rails 2.0 is almost here. But before we
can slap on the final stamp, we’re going to pass through
a couple of trial release phases. The first is this preview
release, which allows you to sample the goodies in their
almost finished state.
• 2.0
•
•
• by DHH

We might change a few things or add something else, but by and large, this
is how Rails 2.0 is going to look and feel. After this release have had a
chance to be tried out, we’re going to move to a release candidate or two
(or three, depending on how many we need). Then, the final release.
•
2.0
•
•

Before the release of 2.0, we’re also going to be putting
out 1.2.4, which will include a variety of bug fixes and
the last deprecation warnings to get you ready for
upgrading an existing application to 2.0 standards.
• 2.0 1.2.4
•
•
• 2.0
deprecation warning

Enough about process. Let me tell you a little bit about
what’s new in Rails 2.0:
• Rails 2.0

Action Pack: Resources
•
• namespace
• rake routes routes
•

Action Pack: Resources
map.resources( :users, :has_many => :friends )
config/routes

Action Pack: Multiview
# should go in config/initializers/mime_types.rb
Mime.register_alias \"text/html\", :iphone
• respond_to class ApplicationController < ActionController::Base
before_filter :adjust_format_for_iphone
• show.rhtml private
show.html.erb def adjust_format_for_iphone
if request.env[\"HTTP_USER_AGENT\"] &&
request.env[\"HTTP_USER_AGENT\"][/(iPhone|iPod)/]
• request.format = :iphone
3.0 show.rhtml deprecated end
end
• show.csv.erb text/csv CSV end
class PostsController < ApplicationController
def index
respond_to do |format|
• − format.html # renders index.html.erb
format.iphone # renders index.iphone.erb
end
end
end

Action Pack: Record identification
# person is a Person object, which by convention will
# be mapped to person_url for lookup
redirect_to(person)
link_to(person.name, person)
form_for(person)
•
• URL
• URL
• :controller=>:user,:action=>:index
• form_to(person) person (PUT)
(POST) form action

Action Pack: HTTP Loving
class PostsController < ApplicationController
USER_NAME, PASSWORD = \"dhh\", \"secret\"
before_filter :authenticate, :except => [ :index ]
• Basic ( ) def index
render :text => \"Everyone can see me!\"
end
• javascript_include_tag def edit
render :text => \"I'm only accessible if you know
(:all,:cache=>true) the password\"
end
private
public/javascripts/all.js def authenticate
authenticate_or_request_with_http_basic do |
user_name, password|
user_name == USER_NAME && password
== PASSWORD
end
end
end

Action Pack: Security
• form Ajax
CSRF
• XSS
TextHelper#sanitize
• HTTP only cookies

Action Pack: Exception handling
class PostsController < ApplicationController
rescue_from User::NotAuthorized, :with => :deny_access
protected
def deny_access
...
end
end
• rescue_from

Action Pack: Miscellaneous
• atom RSS # index.atom.builder:
atom_feed do |feed|
feed.title(\"My great blog!\")
feed.updated((@posts.first.created_at))
for post in @posts
• feed.entry(post) do |entry|
entry.title(post.title)
entry.content(post.body, :type => 'html')
• asset entry.author do |author|
author.name(\"DHH\")
• end
end
• end
in_place_editor end
auto_complete_for Rails

Active Record: Performance
• Query
• fixture 50-100%

Active Record: Sexy migrations
create_table :people do |t|
t.column, \"account_id\", :integer
t.column, \"first_name\", :string, :null => false
t.column, \"last_name\", :string, :null => false
t.column, \"description\", :text
t.column, \"created_at\", :datetime
t.column, \"updated_at\", :datetime
end
create_table :people do |t|
t.integer :account_id
t.string :first_name, :last_name, :null => false
t.text :description
t.timestamps
end

Active Record: XML in, JSON out
• XML JSON
Person.new.from_xml(“David“)
person.to_json

Active Record: Shedding some weight
acts_as_XYZ
• ActiveRecord
acts_as_XYZ
Rails
./script/plugin install acts_as_list

Active Record: Shedding some weight
DB
• DB gem
•
activerecord-XYZ-adapter

Active Record: with_scope with a dash of syntactic vinegar
• .with_scope public protected
•
•
• .send(:with_scope)
with_scope

ActionWebService out, ActiveResource in
• SOAP vs REST
• SOAP
• ActionWebService gem
• ActiveResource
• ActiveResource ActiveRecord

ActiveSupport
•
• Array#rand
• Hash#except
• Date
• assert_defference
•

Action Mailer
•
•
• assert_email

Rails: The debugger is back
• ruby-debug
• --debugger -u
• ./script/breakpointer

Rails: Clean up your environment
• inflections.rb
• mime_types.rb mime type
environment.rb config

Rails: Easier plugin order
• acts_as_list
• environment.rb
config.plugins = [ :acts_as_list, :all ]

And hundreds upon hundreds of other improvements
•
CHANGELOG

•
• basic
• with_scope
•