json.(memo, :id, :subject, :author_id, :sticky,
    :updated_at, :language, :reward, :all_replies_count,
    :viewed_count, :forum_id)
json.praise_count memo.praise_treads.liker.count
json.replies_count memo.all_replies_count
json.tag memo.tag_repertoires.map(&:name)
json.user_name memo.author.full_name
json.login memo.author.login
json.image_url url_to_avatar(memo.author)