How to use ruby code in coffeescript jquery when we want to select an object with dynamic id?

Well, I know that's a common question and found a lot of advice how to do it but it doesn't work for me and I can't understand what's the matter.

index.html.slim

- books.each do |book|
  .row class = "review_form" id = book.id
    .panel
      == render 'reviews/form', review: review, book: book

book.js.coffee

$('.row.review_form').hide()
  $('#new_review_button').on "click", ->
    $('.row.review_form#<%= book.id %>').show()
    $('#new_review_button').hide()
  $('#cancel_review').on "click", ->
    $(".row.review_form#<%= book.id %>").hide()
    $('#new_review_button').show()

According to instructions if you want to use ruby code in javascript you should use <%= ruby code %> as i'm doing here $('.row.review_form#<%= book.id %>').show() but nothing happens. It seems like when i write <%= in brackets it changes into one string and js doesn't understand it's a selector with ruby code. What am I doing wrong? Please, help, I'm totally confused! ><