ActiveModel::Validations::ConfirmationValidator

    # File lib/active_model/validations/confirmation.rb, line 12
12:       def setup(klass)
13:         klass.send(:attr_accessor, *attributes.map { |attribute| :"#{attribute}_confirmation" })
14:       end

    # File lib/active_model/validations/confirmation.rb, line 6
 6:       def validate_each(record, attribute, value)
 7:         confirmed = record.send(:"#{attribute}_confirmation")
 8:         return if confirmed.nil? || value == confirmed
 9:         record.errors.add(attribute, :confirmation, options)
10:       end