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Merge pull request #9411 from senny/add_auto_explain_removal_as_notab…

…le_change

update 4.0 release notes to reflect the removal of auto explain.
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2 parents 45321a6 + 2777844 commit f80a6a5a39e2ec135bc0ddbdaec23979b84ef22d @fxn fxn committed Feb 25, 2013
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  1. +2 −0 guides/source/4_0_release_notes.md
@@ -200,6 +200,8 @@ Please refer to the [Changelog](https://github.com/rails/rails/blob/master/activ
* 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.
* Added `create_join_table` migration helper to create HABTM join tables.

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