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+* `belongs_to` will now trigger a validation error by default if the association is not present.
+ You can turn this off on a per-association basis with `optional: true`.
+ (Note this new default only applies to new Rails apps that will be generated with
+ `config.active_record.belongs_to_required_by_default = true` in initializer.)
+
+ *Josef Šimánek*
+
* Fixed ActiveRecord::Relation#becomes! and changed_attributes issues for type column
Fixes #17139.