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Add callbacks documentation for upgrading to 4.1.

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It is now expected in 4.1 to use an explicit block rather than implicit
when setting callbacks through ActiveSupport::Callbacks. This commit
highlights this new expectation as part of the upgrading documentation.
This commit is contained in:
Nick Pellant 2014-07-07 12:02:26 +01:00
parent 0e7744e55e
commit 489e531334
1 changed files with 14 additions and 0 deletions
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14
guides/source/upgrading_ruby_on_rails.md
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@ -432,6 +432,20 @@ symbol access is no longer supported. This is also the case for
`store_accessors` based on top of `json` or `hstore` columns. Make sure to use
string keys consistently.
### Explicit block use for `ActiveSupport::Callbacks`
Rails 4.1 now expects an explicit block to be passed when calling
`ActiveSupport::Callbacks.set_callback`. This change stems from
`ActiveSupport::Callbacks` being largely rewritten for the 4.1 release.
```ruby
# Rails 4.1
set_callback :save, :around, ->(r, block) { stuff; result = block.call; stuff }
# Rails 4.0
set_callback :save, :around, ->(r, &block) { stuff; result = block.call; stuff }
```
Upgrading from Rails 3.2 to Rails 4.0
-------------------------------------