Formオブジェクトを用いて作成したデータを、編集・更新できるようにしたいです

前提・実現したいこと

Formオブジェクトを使ってタグ付け機能を行ったのですが編集ができなくなっています。
どうしたらいいですか俺がいします。

発生している問題・エラーメッセージ

ActionController::ParameterMissing in PostsController#update
param is missing or the value is empty: posts_tag

def update_params
  エラー文 params.require(:posts_tag).permit(:title, :text, :name).merge(user_id: current_user.id, post_id: params[:id])
  end

  def set_post

該当のソースコード

posts_controller

ruby
1class PostsController < ApplicationController
2  before_action :set_post, only: [:edit, :show, :update, :destroy]
3  before_action :move_to_index, except: [:index, :show, :search]
4
5  def index
6    @posts = Post.includes(:user).order(created_at: :desc)
7  end
8
9  def new
10    @poststag = PostsTag.new
11  end
12
13  def create
14    @poststag = PostsTag.new(post_params)
15    if #@poststag.valid?
16      @poststag.save
17      return redirect_to root_path
18    else
19      render "new"
20    end
21  end
22
23  def destroy
24    @post.destroy
25  end
26
27  def edit
28    @poststag = PostsTag.new(title: @post.title, text: @post.text)
29  end
30
31  def update
32    @poststag = PostsTag.new(update_params)
33    if @poststag.valid?
34       @poststag.update
35       redirect_to root_path
36    else
37      render :edit
38    end
39  end
40
41  def show
42    @poststag = PostsTag.new(title: @post.title, text: @post.text)
43    @comment = Comment.new
44    @comments = @post.comment.includes(:user)
45  end
46
47  def search
48    @posts = Post.search(params[:keyword])
49  end
50
51  private
52
53  def post_params
54    params.require(:posts_tag).permit(:title, :text, :name).merge(user_id: current_user.id)
55  end
56
57  def update_params
58     params.require(:posts_tag).permit(:title, :text, :name).merge(user_id: current_user.id, post_id: params[:id])
59  end
60
61  def set_post
62    @post = Post.find(params[:id])
63  end
64
65  def move_to_index
66    unless user_signed_in?
67      redirect_to action: :index
68    end
69  end
70end

model/posts_tag

ruby
1class PostsTag
2
3  include ActiveModel::Model
4  attr_accessor :text,:title,:user_id, :name
5
6  with_options presence: true do
7    validates :name
8    validates :text
9    validates :title
10    validates :user_id
11  end
12
13  delegate :persisted?, to: :post
14
15  def initialize(attributes = nil, post: Post.new)
16    @post = post
17    attributes ||= default_attributes
18    super(attributes)
19  end
20
21
22    def save
23      return if invalid?
24
25      ActiveRecord::Base.transaction do
26        tags = split_tag_names.map { |posts_tag| Tag.find_or_create_by!(posts_tag: posts_tag) }
27        post.update!(title: title, text: text, name: name)
28      end
29    rescue ActiveRecord::RecordInvalid
30      false
31    end
32
33    def to_model
34      post
35    end
36
37    private
38
39    attr_reader :post
40    def default_attributes
41      {
42        title: post.title,
43        text: post.text,
44        name: post.name.pluck(:name).join(',')
45      }
46    end
47
48    def split_tag_names
49      tag_names.split(',')
50    end
51end

viwes/edit

ruby
1<div class="contents row">
2  <div class="container">
3    <h3>編集する</h3>
4    <%= form_with model: @poststsg, url: "/posts/#{@post.id}",method:"put", local: true  do |form| %>
5      <%= form.text_field :title, placeholder: "Nickname" %>
6      <%= form.text_field :name, placeholder: "tag" %>
7      <%= form.text_area :text, placeholder: "text", rows: "10" %>
8      <%= form.submit "SEND" %>
9    <% end %>
10  </div>
11</div>

README
1## users テーブル
2
3| Column             | Type   | Options     |
4| ------------------ | ------ | ----------- |
5| nickname           | string | null: false |
6| email              | string | null: false |
7| encrypted_password | string | null: false |
8
9### Association
10
11- has_many :posts
12- has_many :comments
13
14## tags テーブル
15
16| Column | Type   | Options     |
17| ------ | ------ | ----------- |
18| name   | string | null: false |
19
20### Association
21
22- has_many :post_tag_relations
23- has_many :posts, through: :post_tag_relations
24
25## post_tag_relations テーブル
26
27| Column | Type       | Options                        |
28| ------ | ---------- | ------------------------------ |
29| post   | references | null: false, foreign_key: true |
30| tag    | references | null: false, foreign_key: true |
31
32### Association
33
34- belongs_to :post
35- belongs_to :tag
36
37## comments テーブル
38
39| Column  | Type       | Options                        |
40| ------- | ---------- | ------------------------------ |
41| text    | text       | null: false                    |
42| user    | references | null: false, foreign_key: true |
43| post    | references | null: false, foreign_key: true |
44
45### Association
46
47- belongs_to :user
48- belongs_to :post
49
50## posts テーブル
51
52| Column  | Type       | Options                        |
53| ------- | ---------- | ------------------------------ |
54| title   | string     | null: false                    |
55| text    | text       | null: false                    |
56| user    | references | null: false, foreign_key: true |
57
58### Association
59
60- has_many :post_tag_relations
61- has_many :tags, through: :post_tag_relations
62- has_many :comment
63- belongs_to :user