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Make sure create! raises errors on validation when creating multiple records. [hasmanyjosh] Closes #8952


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Fix bug where action caching sets the content type to the ActionCachePath object.  Closes #9282 [mindforge]

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Improve url_for documentation for ActionController::Base and UrlRewriter.  Closes #9022. Closes #9077.  [juanjo.bazan]


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 * Generate Reader and Writer methods which cache attribute values in hashes.  This is to avoid repeatedly parsing the same date or integer columns.
 * Move the attribute related methods out to attribute_methods.rb to de-clutter base.rb
 * Change exception raised when users use find with :select then try to access a skipped column.  Plugins could override missing_attribute() to lazily load the columns.
 * Move method definition to the class, instead of the instance
 * Always generate the readers, writers and predicate methods.


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Send freshness information when sending Etags.  Without this internet explorer will not send conditional gets for a resource, but instead hold on to the responses for the current browser session.


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 Major improvement to the documentation for the options / select form helpers. Closes #9038 [kampers, jardeon, wesg]



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Make the utf-handler return the correct value for non-matching regular expressions. Closes #9049 [manfred]


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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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