How do i implement load more comments or reply

Chris i followed your series on implementing commenting systeming using polymorphic is true. Now that i got that implemented. i want to know how do i make this work with will paginate for example....

so in my SHOW.html.erb file i render the partial
<%= render partial: "comments/form", locals: {commentable: @campaign}, class:"form-control" %>
<%= render partial: "comments/comments", locals: {commentable: @campaign} %>

                i would like to limit the number of reply returned and allow the user to paginate to the next say 5 comments etc.... how do i do that? can you give a complete example code ..... remember i use your series of polymorphic true series, so build it from that perspective... response as soon as you can will be apprecited