Add notes to documentation regarding attr_readonly behavior with counter caches and polymorphic associations.  Closes #9835 [saimonmoore, rick]

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belongs_to infers the foreign key from the association name instead of from the class name. Fulfills the 1.2.4 deprecation.


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Raise ProtectedAttributeAssignmentError in development and test environments when mass-assigning to an attr_protected attribute. Closes #9699.

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Fix that ActiveRecord would create attribute methods and override custom attribute getters if the method is also defined in Kernel.methods. [Rick]

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Don't call attr_readonly on polymorphic belongs_to associations, in case it matches the name of some other non-ActiveRecord class/module.  [Rick]

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Try loading activerecord-<adaptername>-adapter gem before trying a plain require so you can use custom gems for the bundled adapters. Also stops gems from requiring an adapter from an old Active Record gem.

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Add attr_readonly to specify columns that are skipped during a normal ActiveRecord #save operation. Closes #6896 [dcmanges]

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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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