dependent_cache.rb

  def reload
    super
    @dependent_cache = {}
  end

  def dependent_cache(property, key)
    @dependent_cache ||= {}
    cached = @dependent_cache[property]
    return cached[:value] if cached && cached[:key] == key
    yield.tap do |value|
      @dependent_cache[property] = {
        key: key,
        value: value,
      }
    end
  end

  def direct_reports
    dependent_cache(:direct_reports, owned_domain) do
      User.by_domain(owned_domain)
    end
  end