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Synced AR release notes [ci-skip]

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Godfrey Chan 2014-08-19 18:20:05 -07:00
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guides/source/4_2_release_notes.md
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@ -305,6 +305,17 @@ for detailed changes.
### Deprecations
* Deprecated swallowing of errors inside `after_commit` and `after_rollback`.
([Pull Request](https://github.com/rails/rails/pull/16537))
* Deprecated calling `DatabaseTasks.load_schema` without a connection. Use
`DatabaseTasks.load_schema_current` instead.
([Commit](https://github.com/rails/rails/commit/f15cef67f75e4b52fd45655d7c6ab6b35623c608))
* Deprecated `Reflection#source_macro` without replacement as it is no longer
needed in Active Record.
([Pull Request](https://github.com/rails/rails/pull/16373))
* Deprecated broken support for automatic detection of counter caches on
`has_many :through` associations. You should instead manually specify the
counter cache on the `has_many` and `belongs_to` associations for the
@ -342,6 +353,13 @@ for detailed changes.
### Notable changes
* The PostgreSQL adapter now supports the `JSONB` datatype in PostgreSQL 9.4+.
([Pull Request](https://github.com/rails/rails/pull/16220))
* The `#references` method in migrations now supports a `type` option for
specifying the type of the foreign key (e.g. `:uuid`).
([Pull Request](https://github.com/rails/rails/pull/16231))
* Added a `:required` option to singular associations, which defines a
presence validation on the association.
([Pull Request](https://github.com/rails/rails/pull/16056))