敏捷Web開發框架 Rails 3.1.1.rc1 發布

Ruby on Rails 是一個用于開發數據庫驅動的網絡應用程序的完整框架。Rails基于MVC（模型- 視圖- 控制器）設計模式。從視圖中的Ajax應用，到控制器中的訪問請求和反饋，到封裝數據庫的模型，Rails 為你提供一個純Ruby的開發環境。發布網站時，你只需要一個數據庫和一個網絡服務器即可。

Ruby On Rails是一個用于編寫網絡應用程序的軟件包.它基于一種計算機軟件語言Ruby,給程序開發人員提供了強大的框架支持.你可以用比以前少的多的代碼和 短的多的時間編寫出一流的網絡軟件.比較著名的社區網站43things.com, odeo.com和basecamphq.com就是用Ruby On Rails編寫的.

Ruby On Rails的指導原則是”不要重復你自己”(Don’t Repeat Yourself, 或DRY).意思是說你寫的代碼不會有重復的地方.比如以往數據庫的接口往往是類似的程序代碼但是在很多地方都要重復用到.這無論是給編寫還是維護都造成 了很大的代價.相反,Ruby On Rails給你提供了絕大多數的支持,讓你只需要短短的幾行代碼就可以實現強大的功能.而且,Rails提供了代碼生成工具,讓你甚至不需要編寫一行代碼 就實現強大的管理程序.

Ruby On Rails通過reflection和runtime extension減少了對configuration文件的依靠,這和Java,C#語言的方向有很大不同,讓你減少了很多配置和部署的麻煩,但是性能上卻完全可以應付一般網站的需求.

Rails 支持各類網絡服務器和數據庫。在服務器方面，我們推薦Apache、 lighttpd 或 nginx 代理至 Mongrel （或者使用FastCGI）。 數據庫方面，你可以采用MySQL、PostgreSQL、 SQLite、 Oracle、 SQL Server、 DB2、 或其他任何我們支持的系統。 Rails可以在各類操作系統上運行，不過我們建議采用基于'nix的系統進行開發。
項目地址：http://rubyonrails.org/

8月31日，Rails 3.1 正式版已發布。今天Rails 3.1.1.rc1 發布了，為了漂亮的3.1.1穩定版，你可以try一下，提交bug。如果沒什么問題的話，那么將在GoGaRuCo發布3.1.1最終版，時間下個9月16日。

附更新日志：

ActionMailer

• No changes

ActionPack

• Allow asset tag helper methods to accept :digest => false option in order to completely avoid the digest generation. Useful for linking assets from static html files or from emails when the user could probably look at an older html email with an older asset. [Santiago Pastorino]

• Don't mount Sprockets server at config.assets.prefix if config.assets.compile is false. [Mark J. Titorenko]

• Set relative url root in assets when controller isn't available for Sprockets (eg. Sass files using asset_path). Fixes #2435 [Guillermo Iguaran]

• Fix basic auth credential generation to not make newlines. GH #2882

• Fixed the behavior of asset pipeline when config.assets.digest and config.assets.compile are false and requested asset isn't precompiled. Before the requested asset were compiled anyway ignoring that the config.assets.compile flag is false. [Guillermo Iguaran]

• CookieJar is now Enumerable. Fixes #2795

• Fixed AssetNotPrecompiled error raised when rake assets:precompile is compiling certain .erb files. See GH #2763 #2765 #2805 [Guillermo Iguaran]

• Manifest is correctly placed in assets path when default assets prefix is changed. Fixes #2776 [Guillermo Iguaran]

• Fixed stylesheetlinktag and javascriptincludetag to respect additional options passed by the users when debug is on. [Guillermo Iguaran]

• Fix ActiveRecord#exists? when passsed a nil value

• Fix assertselectemail to work on multipart and non-multipart emails as the method stopped working correctly in Rails 3.x due to changes in the new mail gem.

ActiveModel

• Remove hard dependency on bcrypt-ruby to avoid make ActiveModel dependent on a binary library. You must add the gem explicitly to your Gemfile if you want use ActiveModel::SecurePassword:

  gem 'bcrypt-ruby', '~> 3.0.0'

  See GH #2687. [Guillermo Iguaran]

ActiveRecord

• LRU cache in mysql and sqlite are now per-process caches.

  • lib/activerecord/connectionadapters/mysql_adapter.rb: LRU cache keys are per process id.
  • lib/activerecord/connectionadapters/sqlite_adapter.rb: ditto

• Database adapters use a statement pool for limiting the number of open prepared statments on the database. The limit defaults to 1000, but can be adjusted in your database config by changing 'statement_limit'.

• Fix clash between using 'preload', 'joins' or 'eager_load' in a default scope and including the default scoped model in a nested through association. (GH #2834.) [Jon Leighton]

• Ensure we are not comparing a string with a symbol in HasManyAssociation#inverseupdatescounter_cache?. Fixes GH #2755, where a counter cache could be decremented twice as far as it was supposed to be.

  [Jon Leighton]

• Don't send any queries to the database when the foreign key of a belongs_to is nil. Fixes GH #2828. [Georg Friedrich]

• Fixed findin_batches method to not include order from defaultscope. See GH #2832 [Arun Agrawal]

• Don't compute table name for abstract classes. Fixes problem with setting the primary key in an abstract class. See GH #2791. [Akira Matsuda]

• Psych errors with poor yaml formatting are proxied. Fixes GH #2645 and GH #2731

• Use the LIMIT word with the methods #last and #first. Fixes GH #2783 [Damien Mathieu]

ActiveResource

• No changes

ActiveSupport

• Fixed performance issue where TimeZone lookups would require tzinfo each time [Tim Lucas]

• ActiveSupport::OrderedHash is now marked as extractable when using Array#extract_options! [Prem Sichanugrist]

Railties

• No changes