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Add note about JSON/JSONB serialization changes #30300

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Sep 4, 2017
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Add note about JSON/JSONB serialization changes #30300

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9 changes: 9 additions & 0 deletions guides/source/upgrading_ruby_on_rails.md
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Expand Up @@ -342,6 +342,15 @@ When using Ruby 2.4, you can preserve the timezone of the receiver when calling

ActiveSupport.to_time_preserves_timezone = false

### Changes with JSON/JSONB serialization

In Rails 5.0, how JSON/JSONB attributes are serialized and deserialized changed. Now, if
you set a column equal to a `String`, Active Record will no longer turn that string
into a `Hash`, and will instead only return the string. This is not limited to code
interacting with models, but also affects `:default` column settings in `db/schema.rb`.
It is recommended that you do not set columns equal to a `String`, but pass a `Hash`
instead, which will be converted to and from a JSON string automatically.

Upgrading from Rails 4.1 to Rails 4.2
-------------------------------------

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