UrlGenerationErrorを解決したい

投稿のshowページへのリンク切替え時に以下のエラーが発生しております。

ActionController::UrlGenerationError in Books#show
Showing /home/ec2-user/environment/bookers-level2.herokuapp/app/views/books/show.html.erb where line #42 raised:

No route matches {:action=>"edit", :controller=>"books", :id=>nil} missing required keys: [:id]
Extracted source (around line #42):
40      <td><%= @book.title %></td>
41      <td><%= @book.body %></td>
42      <td><%= link_to "Edit", edit_book_path(@book), class: "btn btn-success" %></td>
43      <td><%= link_to "Delete", book_path(@book), class: "btn btn-danger", method: :delete %></td>
44    </tr>
45  </tbody>

link_to "Delete", book_path(@book)の引数は間違っていないと思うのですが、エラーになってしまい解決できません。

books_controller.rb

class BooksController < ApplicationController
  before_action :authenticate_user!, only: [:show]
  
  def create
    book = Book.new(book_params)
    book.user_id = current_user.id
    book.save!
    redirect_to user_url(current_user.id)
  end
  
  def index
    @book = Book.page(params[:book]).reverse_order
  end

  def show
    @user = User.find(params[:id])
    @book = Book.new
  end

  def edit
    @book = Book.find(params[:id])
  end
  
  def update
    book = Book.find(params[:id])
    book.update(book_params)
    redirect_to user_url(current_user.id)
  end
  
  def destroy
    @book = Book.find(params[:id])
    @book.destroy
    redirect_to 
  end
  
  private
  
  def book_params
    params.require(:book).permit(:title, :body)
  end
  
end

books/show.html.erb

<%= render 'shared/header' %>

<div class="top">

<div class="container">
  <div class="row">
    <div class="col-lg-3">
    
    <p>User info</p>
      <%= attachment_image_tag @user, :profile_image, :fill, 150, 150, format: 'jpeg', fallback: "no_image.jpg", size:'150x150' %>
        <table class="table">
          <tr>
　　        <th>name</th>
　　        <th><%= @user.name %></th>
　        </tr>
　        <tr>
　　        <th>introduction</th>
　　        <th><%= @user.introduction %></th>
　　      </tr>
        </table>
      <%= link_to  edit_user_path, class: "btn btn-default" do %>
        <i class="fa fa-wrench"></i>
      <% end %>
      <p>New book</p>
      <%= form_for @book do |f| %>
        <p>Title</p>
        <%= f.text_field :title %>
        <p>Opinion</p>
        <%= f.text_area :body %>
        <%= f.submit 'Create Book' %>
      <% end %>
    </div>
        
    <div class="col-lg-9">
      <p>Book detail</p>
      <table class="table table-hover">
        <tbody>
          <tr>
            <td><%= attachment_image_tag @user, :profile_image, :fill, 50, 50, format: 'jpeg', fallback: "no_image.jpg", size:'50x50' %><br><%= @user.name %></td>
            <td><%= @book.title %></td>
            <td><%= @book.body %></td>
            <td><%= link_to "Edit", edit_book_path(@book), class: "btn btn-success" %></td>
            <td><%= link_to "Delete", book_path(@book), class: "btn btn-danger", method: :delete %></td>
          </tr>
        </tbody>
      </table>
    </div>
    
  </div>
</div>

</div>

<%= render 'shared/footer' %>

お気づきの点がありましたらご指摘をお願い致します。