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Merge pull request #16086 from nickpellant/master
Add callbacks documentation for upgrading to 4.1.
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@ -432,6 +432,20 @@ symbol access is no longer supported. This is also the case for
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`store_accessors` based on top of `json` or `hstore` columns. Make sure to use
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string keys consistently.
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### Explicit block use for `ActiveSupport::Callbacks`
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Rails 4.1 now expects an explicit block to be passed when calling
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`ActiveSupport::Callbacks.set_callback`. This change stems from
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`ActiveSupport::Callbacks` being largely rewritten for the 4.1 release.
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```ruby
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# Previously in Rails 4.0
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set_callback :save, :around, ->(r, &block) { stuff; result = block.call; stuff }
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# Now in Rails 4.1
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set_callback :save, :around, ->(r, block) { stuff; result = block.call; stuff }
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```
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Upgrading from Rails 3.2 to Rails 4.0
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-------------------------------------
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