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Prefer to instantiate fixtures with model classes instead of their names, avoiding excess constant lookups. Closes #10677 [nwilmes]


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Document that eager loading doesn't work with polymorphic associations. Closes #10610 [Xavier Noria]


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pdate_all ignores scoped :order and :limit, so post.comments.update_all doesn't try to include the comment order in the update statement. Closes #10686.


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Moved the caching stores from ActionController::Caching::Fragments::* to ActiveSupport::Cache::*. If you're explicitly referring to a store, like ActionController::Caching::Fragments::MemoryStore, you need to update that reference with ActiveSupport::Cache::MemoryStore [DHH] Deprecated ActionController::Base.fragment_cache_store for ActionController::Base.cache_store [DHH] All fragment cache keys are now by default prefixed with the 'views/' namespace [DHH] Added ActiveRecord::Base.cache_key to make it easier to cache Active Records in combination with the new ActiveSupport::Cache::* libraries [DHH] Added ActiveSupport::Gzip.decompress/compress(source) as an easy wrapper for Zlib [Tobias Luetke] Included MemCache-Client to make the improved ActiveSupport::Cache::MemCacheStore work out of the box [Bob Cottrell, Eric Hodel] Added config.cache_store to environment options to control the default cache store (default is FileStore if tmp/cache is present, otherwise MemoryStore is used) [DHH]

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Fixed that you don't have to call super in ActionMailer::TestCase#setup (closes #10406) [jamesgolick]

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Added by parameter to increment, decrement, and their bang varieties so you can do player1.increment!(:points, 5) (closes #10542) [Sam]

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Added that rails:update is run when you do rails:freeze:edge to ensure you also get the latest JS and config files (closes #10565) [jeff]

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Optimize ActiveRecord::Base#exists? to use #select_all instead of #find.  Closes #10605 [jamesh, fcheung, protocool]

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Changed the implementation of Enumerable#group_by to use a double array approach instead of a hash such that the insert order is honored [DHH/Marcel]

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Ruby 1.9 compat: introduce ActiveSupport::FrozenObjectError normalize TypeError vs RuntimeError handling. Closes #10645 [Frederick Cheung]


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