active_model_serializers condition sideloading

sideload_cats.rb

class CatsController < ApplicationController
  def index
    render json: Cat.all, simple: params[:simple], status: :ok
  end
end

class CatSerializer < ActiveModel::Serializer
  attributes :id, :age, :name

  has_many :birds
  has_many :squirrels

  def include_birds?
    !options[:simple]
  end
  
  def include_squirrels?
    !options[:simple]
  end
end