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| -rw-r--r-- | guides/source/upgrading_ruby_on_rails.md | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/guides/source/upgrading_ruby_on_rails.md b/guides/source/upgrading_ruby_on_rails.md index 49a0584d51..651b86275a 100644 --- a/guides/source/upgrading_ruby_on_rails.md +++ b/guides/source/upgrading_ruby_on_rails.md @@ -397,6 +397,15 @@ 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 ------------------------------------- |