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

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commit 277784459f73a82581a3423d9a92477130729eb1 1 parent 45321a6
@senny senny authored
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  1. +2 −0  guides/source/4_0_release_notes.md
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2  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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