Railsで編集した内容をアップデートできません

前提・実現したいこと

編集内容をupdateしたいです。
updateボタンは押せるのですが、編集内容が反映されません。

発生している問題・エラーメッセージ

エラーメッセージ

該当のソースコード

controller
1class BooksController < ApplicationController
2  def top
3  end
4
5  def index
6    @books = Book.all
7    @book = Book.new
8  end
9
10  def create
11    @book = Book.new(book_params)
12    if @book.save
13      flash[:notice] = "Book was successfully created."
14      redirect_to book_path(@book.id)
15    else
16      render :index
17    end
18  end
19
20  def show
21    @book = Book.find(params[:id])
22  end
23
24  def edit
25    @book = Book.find(params[:id])
26  end
27
28  def update
29    @book = Book.find(params[:id])
30    if @book.update(book_params)
31      flash[:notice] = "Book was successfully updated."
32      redirect_to book_path(@book.id)
33    else
34      render :edit
35    end
36  end
37
38  def destroy
39    book = Book.find(params[:id])
40    book.destroy
41    redirect_to books_path
42  end
43
44  private
45
46  def book_params
47    params.require(:book).permit(:title, :body)
48  end
49end
50

formhtml
1<%= form_with model:@book, local:true do |f| %>
2  <% if @book.errors.any? %>
3    <div id="error_explanation">
4      <h2><%= pluralize(@book.errors.count, "error") %> prohibited this book from being saved:</h2>
5
6      <ul>
7      <% book.errors.full_messages.each do |message| %>
8        <li><%= message %></li>
9      <% end %>
10      </ul>
11    </div>
12  <% end %>
13
14  <div class="field">
15    <%= f.label :title %>
16    <%= f.text_field :title %>
17  </div>
18
19  <div class="field">
20    <%= f.label :body %>
21    <%= f.text_area :body %>
22  </div>
23
24  <div class="actions">
25    <%= f.submit %>
26  </div>
27<% end %>
28

html
1<h1>Editing Book</h1>
2
3<form>
4  <%= render 'form', book: @book %>
5</form>
6
7<%= link_to 'Show', @book, class: "show_#{@book.id}" %> |
8<%= link_to 'Back', books_path, class: "back" %>