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Updated Changelog to reflect removal of :dependent => :restrict

Based on rails#2502, the option has
been removed.
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1 parent 050f100 commit 25a96234220a0b0ba37934e62102ebc0be270431 @rystraum rystraum committed Jan 13, 2014
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  1. +4 −0 guides/source/upgrading_ruby_on_rails.md
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4 guides/source/upgrading_ruby_on_rails.md
@@ -614,6 +614,10 @@ config.active_record.mass_assignment_sanitizer = :strict
Rails 3.2 deprecates `vendor/plugins` and Rails 4.0 will remove them completely. While it's not strictly necessary as part of a Rails 3.2 upgrade, you can start replacing any plugins by extracting them to gems and adding them to your Gemfile. If you choose not to make them gems, you can move them into, say, `lib/my_plugin/*` and add an appropriate initializer in `config/initializers/my_plugin.rb`.
+### Active Record
+
+Option `:dependent => :restrict` has been removed from `belongs_to`. If you want to prevent deleting the object if there are any associated objects, you can set `:dependent => :destroy` and return `false` after checking for existence of association from any of the associated object's destroy callbacks.
+
Upgrading from Rails 3.0 to Rails 3.1
-------------------------------------

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