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update 4.0 release notes to reflect the removal of auto explain.

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Yves Senn 2013-02-25 09:51:20 +01:00
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guides/source/4_0_release_notes.md
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@ -200,6 +200,8 @@ Please refer to the [Changelog](https://github.com/rails/rails/blob/master/activ
* Remove IdentityMap. * Remove IdentityMap.
* Remove automatic execution of EXPLAIN queries. The option `active_record.auto_explain_threshold_in_seconds` is no longer used and should be removed.
* Adds `ActiveRecord::NullRelation` and `ActiveRecord::Relation#none` implementing the null object pattern for the Relation class. * Adds `ActiveRecord::NullRelation` and `ActiveRecord::Relation#none` implementing the null object pattern for the Relation class.
* Added `create_join_table` migration helper to create HABTM join tables. * Added `create_join_table` migration helper to create HABTM join tables.