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docs, flash message keys are normalized to strings. [ci skip]

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This is a follow up to a668beffd6
This commit is contained in:
Yves Senn 2014-03-05 09:53:39 +01:00
parent 54a120ed55
commit 8d486c63d6
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guides/source/upgrading_ruby_on_rails.md
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@ -111,6 +111,26 @@ in your application, you can add an initializer file with the following content:
This would transparently migrate your existing `Marshal`-serialized cookies into the
new `JSON`-based format.
### Flash structure changes
Flash message keys are
[normalized to strings](https://github.com/rails/rails/commit/a668beffd64106a1e1fedb71cc25eaaa11baf0c1). They
can still be accessed using either symbols or strings. Lopping through the flash
will always yield string keys:
```ruby
flash["string"] = "a string"
flash[:symbol] = "a symbol"
# Rails < 4.1
flash.keys # => ["string", :symbol]
# Rails >= 4.1
flash.keys # => ["string", "symbol"]
```
Make sure you are comparing Flash message keys against strings.
### Changes in JSON handling
There are a few major changes related to JSON handling in Rails 4.1.