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Add info on default layout functionality 3.2 >> 4.0 upgrade

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Stephen Puiszis 2015-05-26 09:59:24 -05:00
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guides/source/upgrading_ruby_on_rails.md
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@ -940,6 +940,8 @@ Please read [Pull Request #9978](https://github.com/rails/rails/pull/9978) for d
* Rails 4.0 has removed the XML parameters parser. You will need to add the `actionpack-xml_parser` gem if you require this feature.
* Rails 4.0 changes the default `layout` lookup set using symbols or procs that return nil. To get the "no layout" behavior, return false instead of nil.
* Rails 4.0 changes the default memcached client from `memcache-client` to `dalli`. To upgrade, simply add `gem 'dalli'` to your `Gemfile`.
* Rails 4.0 deprecates the `dom_id` and `dom_class` methods in controllers (they are fine in views). You will need to include the `ActionView::RecordIdentifier` module in controllers requiring this feature.