create_subscriber_list_service.rb

class CreateSubscriberListService
  include Callable

  def initialize(title:, url:, matching_criteria:, user:)
    @title = title
    @url = url
    @matching_criteria = matching_criteria
    @user = user
  end

  def call
    subscriber_list = FindExactQuery.new(**matching_criteria).exact_match
    return SubscriberList.create!(subscriber_list_params) unless subscriber_list

    subscriber_list.update!(title: title, url: url)
    subscriber_list
  end

private

  attr_reader :title, :url, :matching_criteria, :user

  def subscriber_list_params
    matching_criteria.merge(
      title: title,
      slug: slug,
      url: url,
      signon_user_uid: user.uid,
    )
  end

  def slug
    @slug ||= begin
      result = title.parameterize.truncate(255, omission: "", separator: "-")

      while SubscriberList.where(slug: result).exists?
        result = title.parameterize.truncate(244, omission: "", separator: "-")
        result += "-#{SecureRandom.hex(5)}"
      end

      result
    end
  end
end