ex) = render_async related_products_path(@Product)

render_async.coffee

$(document).one 'turbolinks:load', ->
  if document.documentElement.hasAttribute('data-turbolinks-preview')
    return
  headers = {}
  csrfTokenElement = document.querySelector('meta[name="csrf-token"]')
  headers['X-CSRF-Token'] = csrfTokenElement.content if csrfTokenElement
  $('div[data-render-async-path]').each (_i, div) ->
    $.ajax(
      url: $(this).data('render-async-path')
      method: 'GET'
      headers: headers).done((response) ->
        $(div).replaceWith response
        return
    ).fail (response) ->
      $('.render_async').replaceWith ''

render_async_helper.rb

# frozen_string_literal: true

module RenderAsyncHelper
  def render_async(path)
    tag.div(data: { render_async_path: path })
  end
end