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Added fixture caching thatll speed up a normal fixture-powered test suite between 50% and 100% (closes #9682) [frederick.cheung@gmail.com]

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Fixed that using version-targetted migrates would fail on loggers other than the default one (closes #7430) [valeksenko]

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Added the possibility of using symbols in addition to concrete classes with ActiveRecord::Observer#observe #3998 [robbyrussell/tarmo]

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Added ActiveRecord::Base#to_json/from_json (currently does not support :include like to_xml) [DHH]. Added ActiveRecord::Base#from_xml [DHH]

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RubyGem database adapters: expects a gem named activerecord-<database>-adapter with active_record/connection_adapters/<database>_adapter.rb in its load path.

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Moved acts_as_tree into a plugin of the same name on the official Rails svn (closes #9514) [lifofifo]

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Moved acts_as_nested_set into a plugin of the same name on the official Rails svn (closed #9516) [josh]

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Fix bug where unserializing an attribute attempts to modify a frozen @attributes hash for a deleted record.  [Rick]

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Perform a deep #dup on query cache results so that modifying activerecord attributes does not modify the cached attributes.  [Rick]

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Ensure that has_many :through associations use a count query instead of loading the target when #size is called.  Closes #8800 [lifo]

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