From a8ba6773a7c08d0489c8fc9cdc62ebbfe9b8b3aa Mon Sep 17 00:00:00 2001 From: Pratik Naik Date: Thu, 23 Oct 2008 19:19:23 +0530 Subject: Add release notes --- railties/doc/guides/html/2_2_release_notes.html | 1086 ++++++++++++++++++++ .../guides/html/benchmarking_and_profiling.html | 25 +- railties/doc/guides/source/2_2_release_notes.txt | 396 +++++++ .../source/benchmarking_and_profiling/index.txt | 3 +- 4 files changed, 1498 insertions(+), 12 deletions(-) create mode 100644 railties/doc/guides/html/2_2_release_notes.html create mode 100644 railties/doc/guides/source/2_2_release_notes.txt (limited to 'railties/doc/guides') diff --git a/railties/doc/guides/html/2_2_release_notes.html b/railties/doc/guides/html/2_2_release_notes.html new file mode 100644 index 0000000000..e30145c90f --- /dev/null +++ b/railties/doc/guides/html/2_2_release_notes.html @@ -0,0 +1,1086 @@ + + + + + Ruby on Rails 2.2 Release Notes + + + + + + + + + +
+ + + +
+

Ruby on Rails 2.2 Release Notes

+
+
+

Rails 2.2 delivers a number of new and improved features. This list covers the major upgrades, but doesn't include every little bug fix and change. If you want to see everything, check out the list of commits in the main Rails repository on GitHub.

+

Along with Rails, 2.2 marks the launch of the Ruby on Rails Guides, the first results of the ongoing Rails Guides hackfest. This site will deliver high-quality documentation of the major features of Rails.

+
+
+

1. Infrastructure

+
+

Rails 2.2 is a significant release for the infrastructure that keeps Rails humming along and connected to the rest of the world.

+

1.1. Internationalization

+

Rails 2.2 supplies an easy system for internationalization (or i18n, for those of you tired of typing).

+
+

1.2. Compatibility with Ruby 1.9 and JRuby

+

Along with thread safety, a lot of work has been done to make Rails work well with JRuby and the upcoming Ruby 1.9. With Ruby 1.9 being a moving target, running edge Rails on edge Ruby is still a hit-or-miss proposition, but Rails is ready to make the transition to Ruby 1.9 when the latter is released.

+
+

2. Documentation

+
+

The internal documentation of Rails, in the form of code comments, has been improved in numerous places. In addition, the Ruby on Rails Guides project is the definitive source for information on major Rails components. In its first official release, the Guides page includes:

+
    +
  • +

    +Getting Started with Rails +

    +
  • +
  • +

    +Rails Database Migrations +

    +
  • +
  • +

    +Active Record Associations +

    +
  • +
  • +

    +Active Record Finders +

    +
  • +
  • +

    +Layouts and Rendering in Rails +

    +
  • +
  • +

    +Action View Form Helpers +

    +
  • +
  • +

    +Rails Routing from the Outside In +

    +
  • +
  • +

    +Basics of Action Controller +

    +
  • +
  • +

    +Rails Caching +

    +
  • +
  • +

    +Testing Rails Applications +

    +
  • +
  • +

    +Securing Rails Applications +

    +
  • +
  • +

    +Debugging Rails Applications +

    +
  • +
  • +

    +Benchmarking and Profiling Rails Applications +

    +
  • +
  • +

    +The Basics of Creating Rails Plugins +

    +
  • +
+

All told, the Guides provide tens of thousands of words of guidance for beginning and intermediate Rails developers.

+

If you want to these generate guides locally, inside your application:

+
+
+
rake doc:guides
+
+

This will put the guides inside RAILS_ROOT/doc/guides and you may start surfing straight away by opening RAILS_ROOT/doc/guides/index.html in your favourite browser.

+
+
+

3. Better integration with HTTP : Out of the box ETag support

+
+

Supporting the etag and last modified timestamp in HTTP headers means that Rails can now send back an empty response if it gets a request for a resource that hasn't been modified lately. This allows you to check whether a response needs to be sent at all.

+
+
+
class ArticlesController < ApplicationController
+  def show_with_respond_to_block
+    @article = Article.find(params[:id])
+
+    # If the request sends headers that differs from the options provided to stale?, then
+    # the request is indeed stale and the respond_to block is triggered (and the options
+    # to the stale? call is set on the response).
+    #
+    # If the request headers match, then the request is fresh and the respond_to block is
+    # not triggered. Instead the default render will occur, which will check the last-modified
+    # and etag headers and conclude that it only needs to send a "304 Not Modified" instead
+    # of rendering the template.
+    if stale?(:last_modified => @article.published_at.utc, :etag => @article)
+      respond_to do |wants|
+        # normal response processing
+      end
+    end
+  end
+
+  def show_with_implied_render
+    @article = Article.find(params[:id])
+
+    # Sets the response headers and checks them against the request, if the request is stale
+    # (i.e. no match of either etag or last-modified), then the default render of the template happens.
+    # If the request is fresh, then the default render will return a "304 Not Modified"
+    # instead of rendering the template.
+    fresh_when(:last_modified => @article.published_at.utc, :etag => @article)
+  end
+end
+
+
+

4. Thread Safety

+
+

The work done to make Rails thread-safe is rolling out in Rails 2.2. Depending on your web server infrastructure, this means you can handle more requests with fewer copies of Rails in memory, leading to better server performance and higher utilization of multiple cores.

+

To enable multithreaded dispatching in production mode of your application, add the following line in your config/environments/production.rb:

+
+
+
config.threadsafe!
+
+
+
+

5. Active Record

+
+

There are two big additions to talk about here: transactional migrations and pooled database transactions. There's also a new (and cleaner) syntax for join table conditions, as well as a number of smaller improvements.

+

5.1. Transactional Migrations

+

Historically, multiple-step Rails migrations have been a source of trouble. If something went wrong during a migration, everything before the error changed the database and everything after the error wasn't applied. Also, the migration version was stored as having been executed, which means that it couldn't be simply rerun by rake db:migrate:redo after you fix the problem. Transactional migrations change this by wrapping migration steps in a DDL transaction, so that if any of them fail, the entire migration is undone. In Rails 2.2, transactional migrations are supported on PostgreSQL only. The code is extensible to other database types in the future.

+
+

5.2. Connection Pooling

+

Connection pooling lets Rails distribute database requests across a pool of database connections that will grow to a maximum size (by default 5, but you can add a pool key to your database.yml to adjust this). This helps remove bottlenecks in applications that support many concurrent users. There's also a wait_timeout that defaults to 5 seconds before giving up. ActiveRecord::Base.connection_pool gives you direct access to the pool if you need it.

+
+
+
development:
+  adapter: mysql
+  username: root
+  database: sample_development
+  pool: 10
+  wait_timeout: 10
+
+
+

5.3. Hashes for Join Table Conditions

+

You can now specify conditions on join tables using a hash. This is a big help if you need to query across complex joins.

+
+
+
class Photo < ActiveRecord::Base
+  belongs_to :Product
+end
+
+class Product < ActiveRecord::Base
+  has_many :products
+end
+
+# Get all products with copyright-free photos:
+Product.find(:all, :joins => :photo,
+  :conditions => { :photos => { :copyright => false }})
+
+
+

5.4. New Dynamic Finders

+

Two new sets of methods have been added to Active Record's dynamic finders family.

+

5.4.1. find_last_by_<attributes>

+

The find_last_by_<attribute> method is equivalent to Model.last(:conditions ⇒ {:attribute ⇒ value})

+
+
+
# Get the last user who signed up from London
+User.find_last_by_city('London')
+
+
+

5.4.2. find_by_<attributes>!

+

The new bang! version of find_by_<attribute>! is equivalent to +Model.first(:conditions ⇒ {:attribute ⇒ value}) || raise ActiveRecord::RecordNotFound Instead of returning nil if it can't find a matching record, this method will raise an exception if it cannot find a match.

+
+
+
# Raise ActiveRecord::RecordNotFound exception if 'Moby' hasn't signed up yet!
+User.find_by_name!('Moby')
+
+
+

5.5. Other ActiveRecord Changes

+
    +
  • +

    +rake db:migrate:redo now accepts an optional VERSION to target that specific migration to redo +

    +
  • +
  • +

    +Set config.active_record.timestamped_migrations = false to have migrations with numeric prefix instead of UTC timestamp. +

    +
  • +
  • +

    +Counter cache columns (for associations declared with :counter_cache ⇒ true) do not need to be initialized to zero any longer. +

    +
  • +
  • +

    +ActiveRecord::Base.human_name for an internationalization-aware humane translation of model names +

    +
  • +
+
+

6. Action Controller

+
+

On the controller side, there are a couple of changes that will help tidy up your routes.

+

6.1. Shallow Route Nesting

+

Shallow route nesting provides a solution to the well-known difficulty of using deeply-nested resources. With shallow nesting, you need only supply enough information to uniquely identify the resource that you want to work with - but you can supply more information.

+
+
+
map.resources :publishers, :shallow => true do |publisher|
+  publisher.resources :magazines do |magazine|
+    magazine.resources :photos
+  end
+end
+
+

This will enable recognition of (among others) these routes:

+
+
+
/publishers/1           ==> publisher_path(1)
+/publishers/1/magazines ==> publisher_magazines_path(1)
+/magazines/2            ==> magazine_path(2)
+/magazines/2/photos     ==> magazines_photos_path(2)
+/photos/3               ==> photo_path(3)
+
+
+

6.2. Method Arrays for Member or Collection Routes

+

You can now supply an array of methods for new member or collection routes. This removes the annoyance of having to define a route as accepting any verb as soon as you need it to handle more than one. With Rails 2.2, this is a legitimate route declaration:

+
+
+
map.resources :photos, :collection => { :search => [:get, :post] }
+
+
+

Action Controller now offers good support for HTTP conditional GET requests, as well as some other additions.

+

6.3. Other Action Controller Changes

+
    +
  • +

    +You can now easily show a custom error page for exceptions raised while routing a request. +

    +
  • +
  • +

    +The HTTP Accept header is disabled by default now. You should prefer the use of formatted URLs (such as /customers/1.xml) to indicate the format that you want. If you need the Accept headers, you can turn them back on with config.action_controller.user_accept_header = true. +

    +
  • +
  • +

    +Benchmarking numbers are now reported in milliseconds rather than tiny fractions of seconds +

    +
  • +
  • +

    +Rails now supports HTTP-only cookies (and uses them for sessions), which help mitigate some cross-site scripting risks in newer browsers. +

    +
  • +
+
+

7. Action View

+
+
    +
  • +

    +javascript_include_tag and stylesheet_link_tag support a new :recursive option to be used along with :all, so that you can load an entire tree of files with a single line of code. +

    +
  • +
  • +

    +The included Prototype javascript library has been upgraded to version 1.6.0.2. +

    +
  • +
  • +

    +RJS#page.reload to reload the browser's current location via javascript +

    +
  • +
  • +

    +The atom_feed helper now takes an :instruct option to let you insert XML processing instructions. +

    +
  • +
+
+

8. Action Mailer

+
+

Action Mailer now supports mailer layouts. You can make your HTML emails as pretty as your in-browser views by supplying an appropriately-named layout - for example, the CustomerMailer class expects to use layouts/customer_mailer.html.erb.

+
+
+

9. Active Support

+
+

Active Support now offers built-in memoization for Rails applications, the each_with_object method, prefix support on delegates, and various other new utility methods.

+

9.1. Memoization

+

Memoization is a pattern of initializing a method once and then stashing its value away for repeat use. You've probably used this pattern in your own applications:

+
+
+
def full_name
+  @full_name ||= "#{first_name} #{last_name}"
+end
+
+

Memoization lets you handle this task in a declarative fashion:

+
+
+
extend ActiveSupport::Memoizable
+
+def full_name
+  "#{first_name} #{last_name}"
+end
+memoize :full_name
+
+

Other features of memoization include unmemoize, unmemoize_all, and memoize_all to turn memoization on or off.

+
+

9.2. each_with_object

+

The each_with_object method provides an alternative to inject, using a method backported from Ruby 1.9. It iterates over a collection, passing the current element and the memo into the block.

+
+
+
%w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase } #=> {'foo' => 'FOO', 'bar' => 'BAR'}
+
+

Lead Contributor: Adam Keys

+

9.3. Delegates With Prefixes

+

If you delegate behavior from one class to another, you can now specify a prefix that will be used to identify the delegated methods. For example:

+
+
+
class Vendor << ActiveRecord::Base
+  has_one :account
+  delegate :email, :password, :to => :account, :prefix => true
+end
+
+

This will produce delegated methods vendor.account_email and vendor.account_password. You can also specify a custom prefix:

+
+
+
class Vendor << ActiveRecord::Base
+  has_one :account
+  delegate :email, :password, :to => :account, :prefix => :owner
+end
+
+

This will produce delegated methods vendor.owner_email and vendor.owner_password.

+

Lead Contributor: Daniel Schierbeck

+

9.4. Other Active Support Changes

+
    +
  • +

    +Extensive updates to ActiveSupport::Multibyte, including Ruby 1.9 compatibility fixes. +

    +
  • +
  • +

    +The addition of ActiveSupport::Rescuable allows any class to mix in the rescue_from syntax. +

    +
  • +
  • +

    +past?, today? and future? for Date and Time classes to facilitate date/time comparisons. +

    +
  • +
  • +

    +Array#second through Array#tenth as aliases for Array#[1] through Array#[9] +

    +
  • +
  • +

    +Enumerable#several? to encapsulate collection.size > 1 +

    +
  • +
  • +

    +Inflector#parameterize produces a URL-ready version of its input, for use in to_param. +

    +
  • +
  • +

    +Time#advance recognizes fractional days and weeks, so you can do 1.7.weeks.ago, 1.5.hours.since, and so on. +

    +
  • +
  • +

    +The included TzInfo library has been upgraded to version 0.3.11. +

    +
  • +
+
+

10. Railties

+
+

In Railties (the core code of Rails itself) the biggest changes are in the config.gems mechanism.

+

10.1. config.gems

+

To avoid deployment issues and make Rails applications more self-contained, it's possible to place copies of all of the gems that your Rails application requires in /vendor/gems. This capability first appeared in Rails 2.1, but it's much more flexible and robust in Rails 2.2, handling complicated dependencies between gems. Gem management in Rails includes these commands:

+
    +
  • +

    +config.gem gem_name in your config/environment.rb file +

    +
  • +
  • +

    +rake gems to list all configured gems, as well as whether they (and their dependencies) are installed or frozen +

    +
  • +
  • +

    +rake gems:install to install missing gems to the computer +

    +
  • +
  • +

    +rake gems:unpack to place a copy of the required gems into /vendor/gems +

    +
  • +
  • +

    +rake gems:unpack:dependencies to get copies of the required gems and their dependencies into /vendor/gems +

    +
  • +
  • +

    +rake gems:build to build any missing native extensions +

    +
  • +
  • +

    +rake gems:refresh_specs to bring vendored gems created with Rails 2.1 into alignment with the Rails 2.2 way of storing them +

    +
  • +
+

You can unpack or install a single gem by specifying GEM=_gem_name on the command line.

+
+

10.2. Other Railties Changes

+
    +
  • +

    +If you're a fan of the Thin web server, you'll be happy to know that script/server now supports Thin directly. +

    +
  • +
  • +

    +script/plugin install <plugin> -r <revision> now works with git-based as well as svn-based plugins. +

    +
  • +
  • +

    +script/console now supports a —debugger option +

    +
  • +
  • +

    +Instructions for setting up a continuous integration server to build Rails itself are included in the Rails source +

    +
  • +
  • +

    +rake notes:custom ANNOTATION=MYFLAG lets you list out custom annotations. +

    +
  • +
  • +

    +Wrapped Rails.env in StringQuestioneer so you can do Rails.env.development? +

    +
  • +
  • +

    +script/generate works without deprecation warnings when RubyGems 1.3.0 is present +

    +
  • +
+
+

11. Deprecated

+
+

A few pieces of older code are deprecated in this release:

+
    +
  • +

    +Rails::SecretKeyGenerator has been replaced by ActiveSupport::SecureRandom +

    +
  • +
  • +

    +render_component is deprecated. There's a render_components plugin available if you need this functionality. +

    +
  • +
  • +

    +country_select has been removed. See the deprecation page for more information and a plugin replacement. +

    +
  • +
  • +

    +ActiveRecord::Base.allow_concurrency no longer has any effect. +

    +
  • +
  • +

    +ActiveRecord::Errors.default_error_messages has been deprecated in favor of I18n.translate(activerecord.errors.messages) +

    +
  • +
  • +

    +The %s and %d interpolation syntax for internationalization is deprecated. +

    +
  • +
  • +

    +String#chars has been deprecated in favor of String#mb_chars. +

    +
  • +
  • +

    +Durations of fractional months or fractional years are deprecated. Use Ruby's core Date and Time class arithmetic instead. +

    +
  • +
+
+

12. Credits

+
+

Release notes compiled by Mike Gunderloy

+
+ +
+
+ + diff --git a/railties/doc/guides/html/benchmarking_and_profiling.html b/railties/doc/guides/html/benchmarking_and_profiling.html index 0a2c995580..9bd1c10dc8 100644 --- a/railties/doc/guides/html/benchmarking_and_profiling.html +++ b/railties/doc/guides/html/benchmarking_and_profiling.html @@ -497,21 +497,24 @@ http://www.gnu.org/software/src-highlite --> by Lorenzo Bettini http://www.lorenzobettini.it http://www.gnu.org/software/src-highlite --> -
[User profiling_tester (master)]$ script/generate performance_test homepage
+
[lifo@null application (master)]$ script/generate performance_test homepage
 

This will generate test/performance/homepage_test.rb:

-
-
require 'test_helper'
-require 'performance_test_help'
+
+
require 'test_helper'
+require 'performance_test_help'
 
-class HomepageTest < ActionController::PerformanceTest
-  # Replace this with your real tests.
-  def test_homepage
-    get '/'
-  end
-end
-
+class HomepageTest < ActionController::PerformanceTest + # Replace this with your real tests. + def test_homepage + get '/' + end +end +

Which you can modify to suit your needs.

4.6. Running tests

diff --git a/railties/doc/guides/source/2_2_release_notes.txt b/railties/doc/guides/source/2_2_release_notes.txt new file mode 100644 index 0000000000..57037e04e9 --- /dev/null +++ b/railties/doc/guides/source/2_2_release_notes.txt @@ -0,0 +1,396 @@ +Ruby on Rails 2.2 Release Notes +=============================== + +Rails 2.2 delivers a number of new and improved features. This list covers the major upgrades, but doesn't include every little bug fix and change. If you want to see everything, check out the link:http://github.com/rails/rails/commits/master[list of commits] in the main Rails repository on GitHub. + +Along with Rails, 2.2 marks the launch of the link:http://guides.rubyonrails.org/[Ruby on Rails Guides], the first results of the ongoing link:http://hackfest.rubyonrails.org/guide[Rails Guides hackfest]. This site will deliver high-quality documentation of the major features of Rails. + +== Infrastructure + +Rails 2.2 is a significant release for the infrastructure that keeps Rails humming along and connected to the rest of the world. + +=== Internationalization + +Rails 2.2 supplies an easy system for internationalization (or i18n, for those of you tired of typing). + +* Lead Contributors: Rails i18 Team +* More information : + - link:http://rails-i18n.org[Official Rails i18 website] + - link:http://www.artweb-design.de/2008/7/18/finally-ruby-on-rails-gets-internationalized[Finally. Ruby on Rails gets internationalized] + - link:http://i18n-demo.phusion.nl[Localizing Rails : Demo application] + +=== Compatibility with Ruby 1.9 and JRuby + +Along with thread safety, a lot of work has been done to make Rails work well with JRuby and the upcoming Ruby 1.9. With Ruby 1.9 being a moving target, running edge Rails on edge Ruby is still a hit-or-miss proposition, but Rails is ready to make the transition to Ruby 1.9 when the latter is released. + +== Documentation + +The internal documentation of Rails, in the form of code comments, has been improved in numerous places. In addition, the link:http://guides.rubyonrails.org/[Ruby on Rails Guides] project is the definitive source for information on major Rails components. In its first official release, the Guides page includes: + +* Getting Started with Rails +* Rails Database Migrations +* Active Record Associations +* Active Record Finders +* Layouts and Rendering in Rails +* Action View Form Helpers +* Rails Routing from the Outside In +* Basics of Action Controller +* Rails Caching +* Testing Rails Applications +* Securing Rails Applications +* Debugging Rails Applications +* Benchmarking and Profiling Rails Applications +* The Basics of Creating Rails Plugins + +All told, the Guides provide tens of thousands of words of guidance for beginning and intermediate Rails developers. + +If you want to these generate guides locally, inside your application: + +[source, ruby] +------------------------------------------------------- +rake doc:guides +------------------------------------------------------- + +This will put the guides inside +RAILS_ROOT/doc/guides+ and you may start surfing straight away by opening +RAILS_ROOT/doc/guides/index.html+ in your favourite browser. + +* Lead Contributors: link:http://guides.rails.info/authors.html[Rails Documentation Team] +* Major contributions from link:http://advogato.org/person/fxn/diary.html[Xavier Nora] and link:http://izumi.plan99.net/blog/[Hongli Lai]. +* More information: + - link:http://hackfest.rubyonrails.org/guide[Rails Guides hackfest] + - link:http://weblog.rubyonrails.org/2008/5/2/help-improve-rails-documentation-on-git-branch[Help improve Rails documentation on Git branch] + +== Better integration with HTTP : Out of the box ETag support + +Supporting the etag and last modified timestamp in HTTP headers means that Rails can now send back an empty response if it gets a request for a resource that hasn't been modified lately. This allows you to check whether a response needs to be sent at all. + +[source, ruby] +------------------------------------------------------- +class ArticlesController < ApplicationController + def show_with_respond_to_block + @article = Article.find(params[:id]) + + # If the request sends headers that differs from the options provided to stale?, then + # the request is indeed stale and the respond_to block is triggered (and the options + # to the stale? call is set on the response). + # + # If the request headers match, then the request is fresh and the respond_to block is + # not triggered. Instead the default render will occur, which will check the last-modified + # and etag headers and conclude that it only needs to send a "304 Not Modified" instead + # of rendering the template. + if stale?(:last_modified => @article.published_at.utc, :etag => @article) + respond_to do |wants| + # normal response processing + end + end + end + + def show_with_implied_render + @article = Article.find(params[:id]) + + # Sets the response headers and checks them against the request, if the request is stale + # (i.e. no match of either etag or last-modified), then the default render of the template happens. + # If the request is fresh, then the default render will return a "304 Not Modified" + # instead of rendering the template. + fresh_when(:last_modified => @article.published_at.utc, :etag => @article) + end +end +------------------------------------------------------- + +== Thread Safety + +The work done to make Rails thread-safe is rolling out in Rails 2.2. Depending on your web server infrastructure, this means you can handle more requests with fewer copies of Rails in memory, leading to better server performance and higher utilization of multiple cores. + +To enable multithreaded dispatching in production mode of your application, add the following line in your +config/environments/production.rb+: + +[source, ruby] +------------------------------------------------------- +config.threadsafe! +------------------------------------------------------- + +* More information : + - link:http://weblog.rubyonrails.org/2008/8/16/josh-peek-officially-joins-the-rails-core[Thread safety project announcement] + - link:http://blog.headius.com/2008/08/qa-what-thread-safe-rails-means.html[Q/A: What Thread-safe Rails Means] + +== Active Record + +There are two big additions to talk about here: transactional migrations and pooled database transactions. There's also a new (and cleaner) syntax for join table conditions, as well as a number of smaller improvements. + +=== Transactional Migrations + +Historically, multiple-step Rails migrations have been a source of trouble. If something went wrong during a migration, everything before the error changed the database and everything after the error wasn't applied. Also, the migration version was stored as having been executed, which means that it couldn't be simply rerun by +rake db:migrate:redo+ after you fix the problem. Transactional migrations change this by wrapping migration steps in a DDL transaction, so that if any of them fail, the entire migration is undone. In Rails 2.2, transactional migrations are supported *on PostgreSQL only*. The code is extensible to other database types in the future. + +* Lead Contributor: link:http://adam.blog.heroku.com/[Adam Wiggins] +* More information: + - link:http://adam.blog.heroku.com/past/2008/9/3/ddl_transactions/[DDL Transactions] + +=== Connection Pooling + +Connection pooling lets Rails distribute database requests across a pool of database connections that will grow to a maximum size (by default 5, but you can add a +pool+ key to your +database.yml+ to adjust this). This helps remove bottlenecks in applications that support many concurrent users. There's also a +wait_timeout+ that defaults to 5 seconds before giving up. +ActiveRecord::Base.connection_pool+ gives you direct access to the pool if you need it. + +[source, ruby] +------------------------------------------------------- +development: + adapter: mysql + username: root + database: sample_development + pool: 10 + wait_timeout: 10 +------------------------------------------------------- + +* Lead Contributor: link:http://blog.nicksieger.com/[Nick Sieger] +* More information: + - link:http://ryandaigle.com/articles/2008/9/7/what-s-new-in-edge-rails-connection-pools[What's New in Edge Rails: Connection Pools] + +=== Hashes for Join Table Conditions + +You can now specify conditions on join tables using a hash. This is a big help if you need to query across complex joins. + +[source, ruby] +------------------------------------------------------- +class Photo < ActiveRecord::Base + belongs_to :Product +end + +class Product < ActiveRecord::Base + has_many :products +end + +# Get all products with copyright-free photos: +Product.find(:all, :joins => :photo, + :conditions => { :photos => { :copyright => false }}) +------------------------------------------------------- + +* More information: + - link:http://ryandaigle.com/articles/2008/7/7/what-s-new-in-edge-rails-easy-join-table-conditions[What's New in Edge Rails: Easy Join Table Conditions] + +=== New Dynamic Finders + +Two new sets of methods have been added to Active Record's dynamic finders family. + +==== find_last_by_ + +The +find_last_by_+ method is equivalent to +Model.last(:conditions => {:attribute => value})+ + +[source, ruby] +------------------------------------------------------- +# Get the last user who signed up from London +User.find_last_by_city('London') +------------------------------------------------------- + +* Lead Contributor: link:http://www.workingwithrails.com/person/9147-emilio-tagua[Emilio Tagua] + +==== find_by_! + +The new bang! version of +find_by_! is equivalent to +Model.first(:conditions => {:attribute => value}) || raise ActiveRecord::RecordNotFound+ Instead of returning +nil+ if it can't find a matching record, this method will raise an exception if it cannot find a match. + +[source, ruby] +------------------------------------------------------- +# Raise ActiveRecord::RecordNotFound exception if 'Moby' hasn't signed up yet! +User.find_by_name!('Moby') +------------------------------------------------------- + +* Lead Contributor: link:http://blog.hasmanythrough.com[Josh Susser] + +=== Other ActiveRecord Changes + +* +rake db:migrate:redo+ now accepts an optional VERSION to target that specific migration to redo +* Set +config.active_record.timestamped_migrations = false+ to have migrations with numeric prefix instead of UTC timestamp. +* Counter cache columns (for associations declared with +:counter_cache => true+) do not need to be initialized to zero any longer. +* +ActiveRecord::Base.human_name+ for an internationalization-aware humane translation of model names + +== Action Controller + +On the controller side, there are a couple of changes that will help tidy up your routes. + +=== Shallow Route Nesting + +Shallow route nesting provides a solution to the well-known difficulty of using deeply-nested resources. With shallow nesting, you need only supply enough information to uniquely identify the resource that you want to work with - but you _can_ supply more information. + +[source, ruby] +------------------------------------------------------- +map.resources :publishers, :shallow => true do |publisher| + publisher.resources :magazines do |magazine| + magazine.resources :photos + end +end +------------------------------------------------------- + +This will enable recognition of (among others) these routes: + +------------------------------------------------------- +/publishers/1 ==> publisher_path(1) +/publishers/1/magazines ==> publisher_magazines_path(1) +/magazines/2 ==> magazine_path(2) +/magazines/2/photos ==> magazines_photos_path(2) +/photos/3 ==> photo_path(3) +------------------------------------------------------- + +* Lead Contributor: link:http://www.unwwwired.net/[S. Brent Faulkner] +* More information: + - link:http://guides.rails.info/routing/routing_outside_in.html#_nested_resources[Rails Routing from the Outside In] + - link:http://ryandaigle.com/articles/2008/9/7/what-s-new-in-edge-rails-shallow-routes[What's New in Edge Rails: Shallow Routes] + +=== Method Arrays for Member or Collection Routes + +You can now supply an array of methods for new member or collection routes. This removes the annoyance of having to define a route as accepting any verb as soon as you need it to handle more than one. With Rails 2.2, this is a legitimate route declaration: + +[source, ruby] +------------------------------------------------------- +map.resources :photos, :collection => { :search => [:get, :post] } +------------------------------------------------------- + +* Lead Contributor: link:http://brennandunn.com/[Brennan Dunn] + +Action Controller now offers good support for HTTP conditional GET requests, as well as some other additions. + +=== Other Action Controller Changes + +* You can now easily link:http://m.onkey.org/2008/7/20/rescue-from-dispatching[show a custom error page] for exceptions raised while routing a request. +* The HTTP Accept header is disabled by default now. You should prefer the use of formatted URLs (such as +/customers/1.xml+) to indicate the format that you want. If you need the Accept headers, you can turn them back on with +config.action_controller.user_accept_header = true+. +* Benchmarking numbers are now reported in milliseconds rather than tiny fractions of seconds +* Rails now supports HTTP-only cookies (and uses them for sessions), which help mitigate some cross-site scripting risks in newer browsers. + +== Action View + +* +javascript_include_tag+ and +stylesheet_link_tag+ support a new +:recursive+ option to be used along with +:all+, so that you can load an entire tree of files with a single line of code. +* The included Prototype javascript library has been upgraded to version 1.6.0.2. +* +RJS#page.reload+ to reload the browser's current location via javascript +* The +atom_feed+ helper now takes an +:instruct+ option to let you insert XML processing instructions. + +== Action Mailer + +Action Mailer now supports mailer layouts. You can make your HTML emails as pretty as your in-browser views by supplying an appropriately-named layout - for example, the +CustomerMailer+ class expects to use +layouts/customer_mailer.html.erb+. + +* More information: + - link:http://ryandaigle.com/articles/2008/9/7/what-s-new-in-edge-rails-mailer-layouts[What's New in Edge Rails: Mailer Layouts] + +== Active Support + +Active Support now offers built-in memoization for Rails applications, the +each_with_object+ method, prefix support on delegates, and various other new utility methods. + +=== Memoization + +Memoization is a pattern of initializing a method once and then stashing its value away for repeat use. You've probably used this pattern in your own applications: + +[source, ruby] +------------------------------------------------------- +def full_name + @full_name ||= "#{first_name} #{last_name}" +end +------------------------------------------------------- + +Memoization lets you handle this task in a declarative fashion: + +[source, ruby] +------------------------------------------------------- +extend ActiveSupport::Memoizable + +def full_name + "#{first_name} #{last_name}" +end +memoize :full_name +------------------------------------------------------- + +Other features of memoization include +unmemoize+, +unmemoize_all+, and +memoize_all+ to turn memoization on or off. + +* Lead Contributor: link:http://joshpeek.com/[Josh Peek] +* More information: + - link:http://ryandaigle.com/articles/2008/7/16/what-s-new-in-edge-rails-memoization[What's New in Edge Rails: Easy Memoization] + - link:http://www.railway.at/articles/2008/09/20/a-guide-to-memoization[Memo-what? A Guide to Memoization] + +=== +each_with_object+ + +The +each_with_object+ method provides an alternative to +inject+, using a method backported from Ruby 1.9. It iterates over a collection, passing the current element and the memo into the block. + +[source, ruby] +------------------------------------------------------- +%w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase } #=> {'foo' => 'FOO', 'bar' => 'BAR'} +------------------------------------------------------- + +Lead Contributor: link:http://therealadam.com/[Adam Keys] + +=== Delegates With Prefixes + +If you delegate behavior from one class to another, you can now specify a prefix that will be used to identify the delegated methods. For example: + +[source, ruby] +------------------------------------------------------- +class Vendor << ActiveRecord::Base + has_one :account + delegate :email, :password, :to => :account, :prefix => true +end +------------------------------------------------------- + +This will produce delegated methods +vendor.account_email+ and +vendor.account_password+. You can also specify a custom prefix: + +[source, ruby] +------------------------------------------------------- +class Vendor << ActiveRecord::Base + has_one :account + delegate :email, :password, :to => :account, :prefix => :owner +end +------------------------------------------------------- + +This will produce delegated methods +vendor.owner_email+ and +vendor.owner_password+. + +Lead Contributor: link:http://workingwithrails.com/person/5830-daniel-schierbeck[Daniel Schierbeck] + +=== Other Active Support Changes + +* Extensive updates to +ActiveSupport::Multibyte+, including Ruby 1.9 compatibility fixes. +* The addition of +ActiveSupport::Rescuable+ allows any class to mix in the +rescue_from+ syntax. +* +past?+, +today?+ and +future?+ for +Date+ and +Time+ classes to facilitate date/time comparisons. +* +Array#second+ through +Array#tenth+ as aliases for +Array#[1]+ through +Array#[9]+ +* +Enumerable#several?+ to encapsulate +collection.size > 1+ +* +Inflector#parameterize+ produces a URL-ready version of its input, for use in +to_param+. +* +Time#advance+ recognizes fractional days and weeks, so you can do +1.7.weeks.ago+, +1.5.hours.since+, and so on. +* The included TzInfo library has been upgraded to version 0.3.11. + +== Railties + +In Railties (the core code of Rails itself) the biggest changes are in the +config.gems+ mechanism. + +=== +config.gems+ + +To avoid deployment issues and make Rails applications more self-contained, it's possible to place copies of all of the gems that your Rails application requires in +/vendor/gems+. This capability first appeared in Rails 2.1, but it's much more flexible and robust in Rails 2.2, handling complicated dependencies between gems. Gem management in Rails includes these commands: + +* +config.gem _gem_name_+ in your +config/environment.rb+ file +* +rake gems+ to list all configured gems, as well as whether they (and their dependencies) are installed or frozen +* +rake gems:install+ to install missing gems to the computer +* +rake gems:unpack+ to place a copy of the required gems into +/vendor/gems+ +* +rake gems:unpack:dependencies+ to get copies of the required gems and their dependencies into +/vendor/gems+ +* +rake gems:build+ to build any missing native extensions +* +rake gems:refresh_specs+ to bring vendored gems created with Rails 2.1 into alignment with the Rails 2.2 way of storing them + +You can unpack or install a single gem by specifying +GEM=_gem_name+ on the command line. + +* Lead Contributor: link:http://github.com/al2o3cr[Matt Jones] +* More information: + - link:http://ryandaigle.com/articles/2008/4/1/what-s-new-in-edge-rails-gem-dependencies[What's New in Edge Rails: Gem Dependencies] + +=== Other Railties Changes + +* If you're a fan of the link:http://code.macournoyer.com/thin/[Thin] web server, you'll be happy to know that +script/server+ now supports Thin directly. +* +script/plugin install -r + now works with git-based as well as svn-based plugins. +* +script/console+ now supports a +--debugger+ option +* Instructions for setting up a continuous integration server to build Rails itself are included in the Rails source +* +rake notes:custom ANNOTATION=MYFLAG+ lets you list out custom annotations. +* Wrapped +Rails.env+ in +StringQuestioneer+ so you can do +Rails.env.development?+ +* +script/generate+ works without deprecation warnings when RubyGems 1.3.0 is present + +== Deprecated + +A few pieces of older code are deprecated in this release: + +* +Rails::SecretKeyGenerator+ has been replaced by +ActiveSupport::SecureRandom+ +* +render_component+ is deprecated. There's a link:http://github.com/rails/render_component/tree/master[render_components plugin] available if you need this functionality. +* +country_select+ has been removed. See the link:http://www.rubyonrails.org/deprecation/list-of-countries[deprecation page] for more information and a plugin replacement. +* +ActiveRecord::Base.allow_concurrency+ no longer has any effect. +* +ActiveRecord::Errors.default_error_messages+ has been deprecated in favor of +I18n.translate('activerecord.errors.messages')+ +* The +%s+ and +%d+ interpolation syntax for internationalization is deprecated. +* +String#chars+ has been deprecated in favor of +String#mb_chars+. +* Durations of fractional months or fractional years are deprecated. Use Ruby's core +Date+ and +Time+ class arithmetic instead. + +== Credits + +Release notes compiled by link:http://afreshcup.com[Mike Gunderloy] \ No newline at end of file diff --git a/railties/doc/guides/source/benchmarking_and_profiling/index.txt b/railties/doc/guides/source/benchmarking_and_profiling/index.txt index 15bf7f6a20..ef45ff62c6 100644 --- a/railties/doc/guides/source/benchmarking_and_profiling/index.txt +++ b/railties/doc/guides/source/benchmarking_and_profiling/index.txt @@ -204,11 +204,12 @@ Rails provides a simple generator for creating new performance tests: [source, shell] ---------------------------------------------------------------------------- -[User profiling_tester (master)]$ script/generate performance_test homepage +[lifo@null application (master)]$ script/generate performance_test homepage ---------------------------------------------------------------------------- This will generate +test/performance/homepage_test.rb+: +[source, ruby] ---------------------------------------------------------------------------- require 'test_helper' require 'performance_test_help' -- cgit v1.2.3