class ActiveModel::Validations::LengthValidator

def validate_each(record, attribute, value)
  value_length = value.respond_to?(:length) ? value.length : value.to_s.length
  errors_options = options.except(*RESERVED_OPTIONS)
  CHECKS.each do |key, validity_check|
    next unless check_value = options[key]
    if !value.nil? || skip_nil_check?(key)
      next if value_length.send(validity_check, check_value)
    end
    errors_options[:count] = check_value
    default_message = options[MESSAGES[key]]
    errors_options[:message] ||= default_message if default_message
    record.errors.add(attribute, MESSAGES[key], errors_options)
  end
end