rails Ajax コメント削除

AJaXでのコメント削除機能がうまく動きません。
どこをどう直せばいいですか？
createのほうはdestroyと同じコードでうまくいきました。

commentcontroller
1class BookCommentsController < ApplicationController
2  def create
3  	@book_show = Book.find(params[:book_id])
4  	@book_comment = current_user.book_comments.build(book_comment_params)
5  	@book_comment.book_id = @book_show.id
6    @book_comment.save
7  end
8
9  def destroy
10    @book_comment = BookComment.find_by(id: params[:id], book_id: params[:book_id])
11    @book_comment.destroy
12  end
13
14  private
15  def book_comment_params
16  	params.require(:book_comment).permit(:comment)
17  end
18end

index
1% book.book_comments.each do |book_comment| %>
2 <li class="comment">
3		    <div class="comment-body bb">
4		        <div class="comment-avatar">
5		            <div class="avatar">
6			            <%= attachment_image_tag @user_show, :profile_image, format: 'jpeg', size: '50x50', fallback: "no_image.jpg" %>
7			        </div>
8			        <div class="comment-text">
9			        <div class="comment-author clearfix">
10				        <a href="#" class="link-author"><%= book_comment.user.name %></a>
11				            <span class="comment-meta">
12				              <span class="comment-date"><%= book_comment.created_at.strftime('%Y/%m/%d') %></span>
13				            </span>
14				    </div>
15				    <div class="comment-entry"><%= book_comment.comment %></div>
16				   </div>
17				    <% if book_comment.user == current_user %>
18				        <div>
19				        	<%= link_to "delete", book_book_comment_path(book_comment.book_id, book_comment.id), method: :delete, remote: true, class: "btn btn-danger pull-rigth" %>
20				        </div>
21				    <% end %>
22				</div>
23		    </div>
24	    </li>
25<% end %>

destroyjs
1$("#comments_area").html("<%= j(render 'book_comments/index', { comments: @book_comment.book.book_comments, book: @book_show }) %>")
2$("textarea").val('')