module AccessControlValidations
    extend ActiveSupport::Concern
  
    included do
      validate :end_date_after_start_date, if: -> { access_revoked && access_end_date.present? }
    end
  
    private
  
    def end_date_after_start_date
      if access_start_date.present? && access_end_date.present? && access_end_date < access_start_date
        errors.add(:access_end_date, 'must be after the start date')
      end
    end
  end