stadtratmonitor/lib/parseable_date_validator.rb

# frozen_string_literal: true

class ParseableDateValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, _value)
    raw_value = record.read_attribute_before_type_cast(attribute)
    return nil if raw_value.nil?

    Date.parse(raw_value.to_json)
    nil
  rescue ArgumentError
    record.errors[attribute] << (options[:message] || I18n.t('errors.messages.unparseable_date'))
  end
end