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Time, DateTime and TimeWithZone #in_time_zone defaults to Time.zone. Removing now unneeded #in_current_time_zone. ActiveRecord time zone aware attributes updated to use #in_time_zone

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Ensure that ActiveRecord::Calculations disambiguates field names with the table name. Closes #11027 [cavalle]

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Added add/remove_timestamps to the schema statements for adding the created_at/updated_at columns on existing tables (closes #11129) [jramirez]

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test_native_types expects DateTime.local_offset instead of DateTime.now.offset; fixes test breakage due to dst transition

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Improve performance on :include/:conditions/:limit queries by selectively joining in the pre-query.  Closes #9560 [dasil003]


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Reapplies [8865] with some fixes


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ActiveRecord::Base#instantiate_time_object only uses Time.zone when Base.time_zone_aware_attributes is true; leverages Time#time_with_datetime_fallback for readability

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Refactor ActiveRecord::ConnectionAdapters::Column.new_time: leverage DateTime failover behavior of Time#time_with_datetime_fallback

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Improve associations performance by using symbol callbacks instead of string callbacks. Closes #11108 [adymo]

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Introduce the :readonly option to all associations. Records from the association cannot be saved. Closes #11084.


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TimeZone#new renamed #local, so that new TimeWithZone instances can be created via Time.zone.local()

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Add Time Zone support to ActiveRecord, and config.time_zone property for specifying a default Time Zone.  Closes #10982 [Geoff Buesing, rick]

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Reshuffle load order so that routes and observers are initialized after plugins and app initializers.  Closes #10980 [rick, fxn]

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Ensure that modifying has_and_belongs_to_many actions clear the query cache.  Closes #10840 [john.andrews]

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Fix issue where Table#references doesn't pass a :null option to a *_type attribute for polymorphic associations.  Closes #10753 [railsjitsu]

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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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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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