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copied!<p>I added a dynamic sitemap to a blog application just recently. These steps should get you started.</p> <p>Add this route towards the bottom of your <code>config/routes.rb</code> file (more specific routes should be listed above it):</p> <pre><code>map.sitemap '/sitemap.xml', :controller => 'sitemap' </code></pre> <p>Create the <code>SitemapController</code> (app/controllers/sitemap_controller):</p> <pre><code>class SitemapController < ApplicationController layout nil def index headers['Content-Type'] = 'application/xml' last_post = Post.last if stale?(:etag => last_post, :last_modified => last_post.updated_at.utc) respond_to do |format| format.xml { @posts = Post.sitemap } # sitemap is a named scope end end end end </code></pre> <p>—As you can see, this is for a blog, so is using a <code>Post</code> model.</p> <p>This is the view template (app/views/sitemap/index.xml.builder):</p> <pre><code>base_url = "http://#{request.host_with_port}" xml.instruct! :xml, :version=>'1.0' xml.tag! 'urlset', 'xmlns' => 'http://www.sitemaps.org/schemas/sitemap/0.9' do for post in @posts do xml.tag! 'url' do xml.tag! 'loc', "#{base_url}#{post.permalink}" xml.tag! 'lastmod', post.last_modified xml.tag! 'changefreq', 'monthly' xml.tag! 'priority', '0.5' end end end </code></pre> <p>That's it! You can test it by bringing up <a href="http://localhost:3000/sitemap.xml" rel="nofollow noreferrer">http://localhost:3000/sitemap.xml</a> (if using Mongrel) in a browser, or perhaps by using cURL.</p> <p>Note that the controller uses the <code>stale?</code> method to issue a HTTP 304 Not Modified response if there are no new posts sinces the sitemap was last requested.</p>

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