app/validators/cron_timezone_validator.rb


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# CronTimezoneValidator
#
# Custom validator for CronTimezone.
class CronTimezoneValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    cron_parser = Gitlab::Ci::CronParser.new(record.cron, record.cron_timezone)
    record.errors.add(attribute, " is invalid syntax") unless cron_parser.cron_timezone_valid?
  end
end