Sqlite3 ist nun die Standard-DB, wenn eine Rails Applikation erstellt wird und im Production-Environment ist ein weiterer Paramter hinzugekommen, der das nach Nachladen der Views steuert:
config/environments/production.rb:
config.action_view.cache_template_loading = true

Dies ist die Liste der sonstigen Änderungen:

Action Pack

• Added delete_via_redirect and put_via_redirect to integration testing #10497 [philodespotos]

• Allow headers[‘Accept’] to be set by hand when calling xml_http_request #10461 [BMorearty]

• Added OPTIONS to list of default accepted HTTP methods #10449 [holoway]

• Added option to pass proc to ActionController::Base.asset_host for maximum configurability #10521 [chuyeow]. Example:

  ActionController::Base.asset_host = Proc.new { |source|
  if source.starts_with?(’/images’)
  “http://images.example.com”
  else
  “http://assets.example.com”
  end
  }

• Fixed that ActionView#file_exists? would be incorrect if @first_render is set #10569 [dbussink]

• Added that Array#to_param calls to_param on all it’s elements #10473 [brandon]

• Ensure asset cache directories are automatically created. #10337 [Josh Peek, Cheah Chu Yeow]

• render :xml and :json preserve custom content types. #10388 [jmettraux, Cheah Chu Yeow]

• Refactor Action View template handlers. #10437, #10455 [Josh Peek]

• Fix DoubleRenderError message and leave out mention of returning false from filters. Closes #10380 [Frederick Cheung]

• Clean up some cruft around ActionController::Base#head. Closes #10417 [ssoroka]

Active Record

• Ensure optimistic locking handles nil #lock_version values properly. Closes #10510 [rick]

• Make the Fixtures Test::Unit enhancements more supporting for double-loaded test cases. Closes #10379 [brynary]

• Fix that validates_acceptance_of still works for non-existent tables (useful for bootstrapping new databases). Closes #10474 [hasmanyjosh]

• Ensure that the :uniq option for has_many :through associations retains the order. #10463 [remvee]

• Base.exists? doesn’t rescue exceptions to avoid hiding SQL errors. #10458 [Michael Klishin]

• Documentation: Active Record exceptions, destroy_all and delete_all. #10444, #10447 [Michael Klishin]

Active Resource

• Added more specific exceptions for 400, 401, and 403 (all descending from ClientError so existing rescues will work) #10326 [trek]

• Correct empty response handling. #10445 [seangeo]

Active Support

• Ruby 1.9 compatibility. #1689, #10466, #10468 [Cheah Chu Yeow, Pratik Naik, Jeremy Kemper]

• TimeZone#to_s uses UTC rather than GMT. #1689 [Cheah Chu Yeow]

• Refactor of Hash#symbolize_keys! to use Hash#replace. Closes #10420 [ReinH]

• Fix HashWithIndifferentAccess#to_options! so it doesn’t clear the options hash. Closes #10419 [ReinH]

Rails

• Changed the default database from mysql to sqlite3, so now running “rails myapp” will have a config/database.yml that’s setup for SQLite3 (which in OS X Leopard is installed by default, so is the gem, so everything Just Works with no database configuration at all). To get a Rails application preconfigured for MySQL, just run “rails -d mysql myapp” [DHH]

• Turned on ActionView::Base.cache_template_loading by default in config/environments/production.rb to prevent file system stat calls for every template loading to see if it changed (this means that you have to restart the application to see template changes in production mode) [DHH]

• Introduce `rake secret` to output a crytographically secure secret key for use with cookie sessions #10363 [revans]

• Fixed that local database creation should consider 127.0.0.1 local #9026 [parcelbrat]

• Fixed that functional tests generated for scaffolds should use fixture calls instead of hard-coded IDs #10435 [boone]

• Added db:migrate:redo and db:migrate:reset for rerunning existing migrations #10431, #10432 [matt]

• RAILS_GEM_VERSION may be double-quoted also. #10443 [James Cox]

• Update rails:freeze:gems to work with RubyGems 0.9.5. [Jeremy Kemper]

Die Originalnachricht findet ihr unter:
http://weblog.rubyonrails.com/2007/12/17/rails-2-0-2-some-new-defaults-and-a-few-fixes