puyopuyotetr.is/app/models/concerns/expireable.rb

# frozen_string_literal: true

module Expireable
  extend ActiveSupport::Concern

  included do
    scope :expired, -> { where.not(expires_at: nil).where('expires_at < ?', Time.now.utc) }

    def expires_in
      return @expires_in if defined?(@expires_in)

      if expires_at.nil?
        nil
      else
        (expires_at - created_at).to_i
      end
    end

    def expires_in=(interval)
      self.expires_at = interval.present? ? interval.to_i.seconds.from_now : nil 
      @expires_in     = interval
    end

    def expire!
      touch(:expires_at)
    end

    def expired?
      expires? && expires_at < Time.now.utc
    end

    def expires?
      !expires_at.nil?
    end
  end
end