rails cocoon 親子孫　フォームによる同時送信

前提・実現したいこと

Rails,cocoonを用いて親子孫関係のテーブルに複数のデータを同時保存を行おうとしています。
親：events　子：menus　孫：notes

発生している問題・エラーメッセージ

子までは保存成功しているのですが、孫がストロングパラメーターによりpermittされずに弾かれてしまいます。

Unpermitted parameter: :notes

該当のソースコード

events_controller.rb

class EventsController < UsersController
  before_action :set_event, only: [:show, :edit, :update, :destroy]
  before_action :move_to_index, except: [:index, :show]

  # GET /events
  # GET /events.json
  def index
    @all_events = Event.all.includes(:user)
    @user = User.find(current_user.id)
   #フォローしているユーザーを取得
    @follow_users = @user.followings.map { |f| f[:id] }
    @follow_users << current_user.id
    
   #フォローユーザーのツイートを表示
    @events = @all_events.where(user_id: @follow_users).order("created_at DESC")
    new
  end

  # GET /events/1
  # GET /events/1.json
  def show
    @event = Event.find(params[:id])
  end

  # GET /events/new
  def new
    @event = Event.new
    @menu = @event.menus.build
    @note = @menu.notes.build
  end

  # GET /events/1/edit
  def edit
  end

  # POST /events
  # POST /events.json
  def create
    index
    @event = Event.new(event_params)

    respond_to do |format|
      if @event.save
        format.html { redirect_to @event, notice: '記録完了' }
        format.json { render :show, status: :created, location: @event }
      else
        format.html { redirect_to root_path, notice: '※記録失敗（本文が空白です）' }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /events/1
  # PATCH/PUT /events/1.json
  def update
    respond_to do |format|
      if @event.update(event_params)
        format.html { redirect_to @event, notice: '記録の変更完了' }
        format.json { render :show, status: :ok, location: @event }
      else
        format.html { render :edit }
        format.json { render json: @event.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /events/1
  # DELETE /events/1.json
  def destroy
    @event.destroy
    respond_to do |format|
      format.html { redirect_to root_path, notice: '記録削除' }
      format.json { head :no_content }
    end
    
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_event
      @event = Event.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def event_params
      params.require(:event).permit(:title, :body, :start_date, :end_date, :image, menus_attributes: [:name, :part, notes_attributes:[:number, :number_unit, :rep, :rep_unit]]).merge(user_id: current_user.id)
      
    end

    def move_to_index
      redirect_to action: :index unless user_signed_in?
    end
end

event.rb

class Event < ApplicationRecord
  belongs_to :user
  validates :body, presence: true
  mount_uploader :image, ImageUploader

  # いいね
  has_many :likes
  has_many :liked_users, through: :likes, source: :user
  # メニュー
  has_many :menus
  accepts_nested_attributes_for :menus
end

menu.rb

class Menu < ApplicationRecord
  belongs_to :event
  has_many :notes, dependent: :destroy
  accepts_nested_attributes_for :notes

end

note.rb

class Note < ApplicationRecord
  belongs_to :menu
end

_form.html.erb

<div class="NewRecord＿Box">

<%= form_with(model: event, local: true) do |form| %>
  <% if event.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(event.errors.count, "error") %> prohibited this event from being saved:</h2>

      <ul>
      <% event.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= form.label :title %>
    <%= form.text_field :title %>
  </div>

  <div class="field">
    <%= form.label :body %>
    <%= form.text_field :body, placholder: "トレーニングの記録を残そう！" , id: "body"%>
  </div>

  <div class="input">
    <%= form.file_field :image, placeholder: "Image", id: "image" %>
  </div>

  <div class="field">
    <%= form.label :menu %>
    <%= form.fields_for :menus do |menu| %>
    種目名: <%= menu.text_field :name %>
    部位: <%= menu.text_field :part %>
      <%= form.fields_for :notes do |note| %>
      重さ: <%= note.text_field :number %>
      回数: <%= note.text_field :rep %>
      <% end %>
    <% end %>
  </div>
  


  <div class="field">
    <%= form.label :start_date %>
    <%= form.datetime_select :start_date %>
  </div>

  <div class="field">
    <%= form.label :end_date %>
    <%= form.datetime_select :end_date %>
  </div>
  

  <div class="input">
    <%= form.submit "WORK OUTを保存" , id: "Newrecord"%>
  </div>

<% end %>
</div>