これでRedisのメモリがもりもりるわけでもないなあ
$ rails c
> s = Status.find(100025539020076391)
> a = s.media_attachments.first
> 10.times do ActiveModelSerializers::SerializableResource.new(a, serializer: REST::MediaAttachmentSerializer).as_json end
[active_model_serializers] Rendered REST::MediaAttachmentSerializer with ActiveModelSerializers::Adapter::Attributes (3.71ms)
: