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+* Change the default error message from `can't be blank` to `must exist` for
+ the presence validator of the `:required` option on `belongs_to`/`has_one` associations.
+
+ *Henrik Nygren*
+
* Assigning an unknown attribute key to an `ActiveModel` instance during initialization
will now raise `ActiveModel::AttributeAssignment::UnknownAttributeError` instead of
`NoMethodError`