# validation method to be included like any other validations methods
# in the models definitions. this one checks that the named attribute
# is a valid UTF-8 format string.
-class Utf8Validator < ActiveModel::EachValidator
+class UTF8Validator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
record.errors.add(attribute, " is invalid UTF-8") unless UTF8.valid? value
end