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SQLite, MySQL, PostgreSQL, Oracle: quote column names in column migration SQL statements. Closes #8466.

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validates_numericality_of takes :greater_than, :greater_than_or_equal_to, :equal_to, :less_than, :less_than_or_equal_to, :odd, and :even options. Closes #3952.

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MySQL: create_database takes :charset and :collation options. Charset defaults to utf8. References #8448.

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Optimistic locking: revert the lock version when an update fails. Closes #7840. Also return the number of affected rows instead of true.

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Load database adapters on demand. Eliminates config.connection_adapters and RAILS_CONNECTION_ADAPTERS. Closes #8456.

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Replace the transaction {|transaction|..} semantics with a new Exception ActiveRecord::Rollback.  Closes #8030  [Koz]


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Document :allow_nil option for validates_acceptance_of since it defaults to true. Closes #8050. [tzaharia]

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Update documentation for :dependent declaration so that it explicitly uses the non-deprecated API. Closes #8069. [danger]

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Added short-hand declaration style to migrations (inspiration from Sexy Migrations, http://errtheblog.com/post/2381) [DHH] Updated resource_scaffold and model generators to use short-hand style migrations [DHH]

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Change Base#to_xml to take the name for a container element for an association from the element name, not the first record's class name.  Closes #7004

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Improve Performance of calling create on has_many :through associations by avoiding loading the target collection. Closes #8150 [evan]

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Added ActiveRecord::Base.inspect to return a column-view like #<Post id:integer, title:string, body:text> [DHH]

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Add helpful debugging info to the ActiveRecord::StatementInvalid exception in ActiveRecord::ConnectionAdapters::SqliteAdapter#table_structure.  Closes #7925. [court3nay]

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Hash#to_xml supports YAML attributes; ActiveRecord::Base#to_xml support serialized attributes. Closes #7502.

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