Fixed DB2 adapter so nullable columns will be determines correctly now and quotes from column default values will be removed (closes #4350) [contact@maik-schmidt.de]

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Fixed that schema changes while the database was open would break any connections to a SQLite database (now we reconnect if that error is throw) [DHH]

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Don't classify the has_one class when eager loading, it is already singular. Add tests. (closes #4117) [jonathan@bluewire.net.nz]

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Allow has_many :through associations to find the source association by setting a custom class (closes #4307) [jonathan@bluewire.net.nz]

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Raise error when trying to select many polymorphic objects with has_many :through or :include (closes #4226) [josh@hasmanythrough.com]

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Fixed has_many :through to include :conditions set on the :through association. closes #4020 [jonathan@bluewire.net.nz]

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Fix that has_many :through honors the foreign key set by the belongs_to association in the join model (closes #4259) [andylien@gmail.com / Rick]

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Fixed that eager loading from belongs_to would cause the association to be double-singularized (closes #4117) [jonathan@bluewire.net.nz]

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Added OpenBase database adapter that builds on top of the http://www.spice-of-life.net/ruby-openbase/ driver. All functionality except LIMIT/OFFSET is supported (closes #3528) [derrickspell@cdmplus.com]

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Rework table aliasing to account for truncated table aliases.  Add smarter table aliasing when doing eager loading of STI associations. This allows you to use the association name in the order/where clause. [Jonathan Viney / Rick Olson] closes #4108

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Add AbstractAdapter#table_alias_for to create table aliases according to the rules of the current adapter. [Rick]

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Provide access to the underlying database connection with Adapter#raw_connection, allows the use of db-specific methods such as postgresql's lo_* . Closes #2090


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Remove broken attempts at handling columns with a a default of 'now()' in the postgresql adapter. Closes #2257


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Added connection#current_database that'll return of the current database (only works in MySQL, SQL Server, and Oracle so far -- please help implement for the rest of the adapters) (closes #3663) [Tom ward]

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Nicer error message on has_many :through when :through reflection can not be found (closes #4042) [court3nay@gmail.com]

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Fixed that Migration#execute would have the table name prefix appended to its query (closes #4110) [mark.imbriaco@pobox.com]

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Alias the has_and_belongs_to_many join table on eager includes. closes #4106 [jeremyevans0@gmail.com]

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Added Base.abstract_class? that marks which classes are not part of the Active Record hierarchy.  closes #3704

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Catch FixtureClassNotFound when using instantiated fixtures on a fixture that has no ActiveRecord model [Rick Olson]

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Allow ordering of calculated results and/or grouped fields in calculations [solo@gatelys.com] closes #4228

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Fixed to_xml across the board to use nice indention, better skip_attributes workings, no type on strings, and cleaned tests [DHH]

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Add documentation for :dependent on associations. [robby@planetargon.com] Closes #4151


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