class Hoge < ApplicationRecord has_many :fugas end class Fuga < ApplicationRecord has_many :bars end class Bar < ApplicationRecord end # app/serializers/hoge_seralizer.rb class HogeSerializer < ActiveModel::Serializer attributes :id, :hogehoge has_many :fugas class FugaSerializer < ActiveModel::Serializer attributes :id, :fugafuga has_many :bars class BarSerializer < ActiveModel::Serializer attrib