Ruby 投稿機能実装中のエラーNoMethodError in PostsController#createの解決

前提・実現したいこと

Rails初心者です。
Rails６で、投稿実装の際、以下のエラーが出て困っております。
どのようにすれば、エラーを解消できるでしょうか？

発生している問題・エラーメッセージ

NoMethodError in PostsController#create
undefined method `current_scope' for Season:Class

該当のソースコード

postcontroller
1def index
2    @post = Post.all
3    end
4   def new
5     @post = Post.new
6   end
7   def create
8     @post = Post.new(posts_params)
9    
10     if @post.save
11       redirect_to root_path
12     else
13       render :new
14     end
15   end
16   private
17   def posts_params
18     params.require(:post).permit(:outer,:tops,:pants,:shoes,:hat,:accessory,:season_id,images:[]).merge(user_id: current_user.id)
19   end
20end
21

newhtmlerb
1<div class="post-sell-contents">
2
3  <div class="post-sell-main">
4    <h2 class="post-sell-title">コーデディネイトの情報を入力</h2>
5    <%= form_with model:@post,url:posts_path,local: true do |f| %>
6
7    <%= render 'shared/error_messages', model: f.object%>
8
9    <%# 投稿画像 %>
10    <div class="img-upload">
11
12      <div class="weight-bold-text">
13        コーディネイト画像
14        <span class="indispensable">必須</span>
15      </div>
16      <div class="click-upload">
17        <p>
18          クリックしてファイルをアップロード
19        </p>
20        <%= f.file_field :images,name: 'post[image][]', id:"post-image" %>
21         <div id="image-list"></div>
22
23      </div>
24      </div>
25
26    <%# /投稿画像 %>
27    <%# アイテム名 %>
28    <div class="new-items">
29      <div class="weight-bold-text">
30        アウター
31
32      </div>
33      <%= f.text_area :outer, class:"post-text", id:"post-name", placeholder:"アウター名", maxlength:"20" %>
34      <div class="new-items">
35      <div class="weight-bold-text">
36        トップス
37        <span class="indispensable">必須</span>
38      </div>
39      <%= f.text_area :tops, class:"post-text", id:"post-name", placeholder:"トップス名", maxlength:"20" %>
40      <div class="new-items">
41      <div class="weight-bold-text">
42        パンツ
43        <span class="indispensable">必須</span>
44      </div>
45      <%= f.text_area :pants, class:"post-text", id:"post-name", placeholder:"パンツ名", maxlength:"20" %>
46      <div class="new-items">
47      <div class="weight-bold-text">
48      靴
49        <span class="indispensable">必須</span>
50      </div>
51      <%= f.text_area :shoes, class:"post-text", id:"post-name", placeholder:"靴名", maxlength:"20" %>
52      <div class="new-items">
53      <div class="weight-bold-text">
54        帽子
55      </div>
56      <%= f.text_area :hat, class:"post-text", id:"post-name", placeholder:"帽子名", maxlength:"20" %>
57      <div class="new-items">
58      <div class="weight-bold-text">
59        アクセサリー
60      </div>
61      <%= f.text_area :accessory, class:"post-text", id:"post-name", placeholder:"アクセサリー名", maxlength:"20" %>  
62          <div class='new-items'>
63            <div class="weight-bold-text">
64            季節
65            <span class="indispensable">必須</span>
66            </div>
67            <%= f.collection_select(:season_id,Season.all,:id,:name,{},{class:"post-text", id:"post-season-fee-status"}) %>
68          </div>
69
70    
71
72    <%# 下部ボタン %>
73    <div class="sell-btn-contents">
74      <%= f.submit "投稿する" ,class:"sell-btn",id: "subit" %>
75      <%=link_to 'もどる', root_path, class:"back-btn" %>
76    </div>
77    <%# /下部ボタン %>
78
79  <% end %>
80 </div>
81</div>

postModel
1class Post < ApplicationRecord
2  extend ActiveHash::Associations::ActiveRecordExtensions
3  belongs_to :user
4  has_one_attached :image
5  belongs_to :season
6  with_options presence: true do
7    validates :tops
8    validates :pants
9    validates :shoes
10    validates :season_id
11
12    validates :season_id, numericality: { other_than: 1 } 
13  end
14end
15

SeasonModel
1class Season < ActiveHash::Base
2  self.data = [
3    { id: 1, name: '--' },
4    { id: 2, name: '春' },
5    { id: 3, name: '夏' },
6    { id: 4, name: '秋' },
7    { id: 5, name: '冬' },
8    { id: 6, name: 'オーラス' },
9  ]
10  nclude ActiveHash::Associations
11  has_many :posts
12  end