Rails 3 JQuery Pagination on a nested model - ruby-on-rails-3

Question

I have watched the railscasts on Pagination with AJAX. I am trying to duplicate his method using a nested model. I seem to be confused because i don't have a view for the child model or a fully integrated controller.
Assume the Product has_many Comments. How can I do the same pagination using will_paginate on comments within a product view?
UPDATE:
Here is most of my attempt (my attempt actually uses kaminari but it's basically the same as will_pagenate):
view/products/comments/_index.html.erb:
<div id="comments">
<% comments.each do |comment| %>
<%= f.fields_for :comments, comments do |comment_builder| %>
<%= render 'products/comments/field', f: comment_builder %>
<% end %>
<% end %>
<%= paginate comments %>
</div>
view/products/comments/_field.html.erb:
<fieldset>
<%= f.hidden_field :_id, :value => f.object._id %>
<%= f.hidden_field :_destroy %>
<%= f.object.text %>
<%= link_to "remove", '#', class: "remove_field" %>
</fieldset>
view/products/comments/_index.js.erb:
$("#comments").html("j render("products/comments/index")) %>");
assets/javascripts/product.js
$('.pagination a').live
click: ->
$(".pagination").html("Page is loading...")
$.getScript(this.href)
false
controllers/comments_controller.rb
class CommentsController < ApplicationController
before_filter :get_product
def index
#comments = #product.comments.desc(:created_at).page(params[:page]).per(10)
respond_to do |format|
format.html # index.html.erb
format.json { render json: #comments }
end
end
private
def get_product
#product = Product.find(params[:product_id]) if params[:product_id]
redirect_to root_path unless defined?(#product)
end
end
views/products/show.html.erb (an excerpt)
<%= render "products/comments/index", f: f, comments: #comments%>
controllers/products_controller.rb
def show
#product = Product.find(params[:id])
#comments = #product.comments.desc(:created_at).page(params[:page]).per(1)
respond_to do |format|
format.html # show.html.erb
format.json { render json: #product }
end
end
view/products/comments/_index.js.erb never gets called. Also is there a more rails-like way of doing this?