rails、投稿のupdateができない、更新できない

前提・実現したいこと

投稿カラムのtitle,bodyの編集、updateができません。

エラーがなくどこが悪いのか特定できず詰まっています。

コントローラーのupdateメソッドが毎回falseでrender :editを実行しているためだと考えましたがupdateがfalseになってしまう原因がわかりません。

発生している問題・エラーメッセージ

updateできない

book_cotrollerのupdateアクション内のupdateメソッドがfalse

エラーメッセージなし

該当のソースコード

下記の他に必要なものがあればコメントもらい次第追加します。よろしくお願いします。

books_controller.rb

class BooksController < ApplicationController
  before_action :set_book, only: [:show, :edit, :update, :destroy]

  # GET /books
  # GET /books.json
  def index
    @book = Book.new
    @books = Book.all
  end

  # GET /books/1
  # GET /books/1.json
  def show
  end

  # GET /books/1/edit
  def edit
  end

  # POST /books
  # POST /books.json
  def create
    @book = Book.new(book_params)
    if @book.save
      redirect_to @book, notice: 'Book was successfully created.'
    else
      render :index
    end
  end

  # PATCH/PUT /books/1
  # PATCH/PUT /books/1.json
  def update
    if @book.update(book_params)
      redirect_to books_path, notice: 'Book was successfully updated.'
    else
      raise @book.error
      render :index , notice: 'update was failed'
    end
  end

  # DELETE /books/1
  # DELETE /books/1.json
  def destroy
    @book.destroy
    redirect_to books_url, notice: 'Book was successfully destroyed.'
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def book_params
      params.require(:book).permit(:title, :body)
    end
end

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