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Resourcen:

• jquery-rails
• Full episode source code

Quellcode:

bundle install
rails g jquery:install

# Gemfile
gem 'jquery-rails'

# comments_controller.rb
def index
  @comments = Comment.where("article_id = ? and created_at > ?", params[:article_id], Time.at(params[:after].to_i + 1))
end

<!-- layouts/application.html.erb -->
<%= javascript_include_tag :defaults %>
<%= csrf_meta_tag %>

<!-- articles/show.html.erb -->
<div id="article" data-id="<%= @article.id %>">
...
<div class="comment" data-time="<%= comment.created_at.to_i %>">

<!-- comments/index.js.erb -->
<% unless @comments.empty? %>
$("#comments").append("<%=raw escape_javascript(render(@comments)) %>");
$("#article h2").text($(".comment").length + " comments");
<% end %>