Building xml sitemaps in rails.

items-sitemap.xml.builder

# Below is a snippet to generate sitemap.xml file
# Reference: http://www.sitemaps.org, http://en.wikipedia.org/wiki/Site_map, http://support.google.com/webmasters/bin/answer.py?hl=en&answer=183668&topic=8476&ctx=topic


xml.instruct!

xml.urlset(:xmlns => "http://www.sitemaps.org/schemas/sitemap/0.9") {
  @items.each do |item|
    xml.url {
      xml.loc(item_url(item))
      xml.changefreq("daily")
      xml.priority("0.5")
    }
  end
}

resources-sitemap.xml.builder

# Below is a snippet to generate sitemap.xml file
# Reference: http://www.sitemaps.org, http://en.wikipedia.org/wiki/Site_map, http://support.google.com/webmasters/bin/answer.py?hl=en&answer=183668&topic=8476&ctx=topic


xml.instruct!

xml.urlset(:xmlns => "http://www.sitemaps.org/schemas/sitemap/0.9") {
  @resources.each do |resource|
    xml.url {
      xml.loc(resource_url(resource))
      xml.changefreq("weekly")
      xml.priority("0.5")
    }
  end
}

routes.rb

get "/sitemapindex.xml" => "welcome#sitemapindex", :as => :sitemapindex

resoureces :resources do
  collection do
    get :sitemap
  end
end

resoureces :items do
  collection do
    get :sitemap
  end
end

welcome-sitemapindex.xml.builder

# Below is a snippet to generate sitemapindex.xml file. Sitemapindex file is required to list multiple sitemap files. Useful when the site has multiple sitemap files
# Reference: http://www.sitemaps.org, http://en.wikipedia.org/wiki/Sitemap_index, http://support.google.com/webmasters/bin/answer.py?hl=en&answer=71453


xml.instruct!

xml.sitemapindex(:xmlns => "http://www.sitemaps.org/schemas/sitemap/0.9") {
  xml.sitemap {
    xml.loc(sitemap_resources_url(:format => :xml))
    xml.lastmod(Time.zone.now.strftime("%Y-%m-%d"))
  }

  xml.sitemap {
    xml.loc(sitemap_items_url(:format => :xml))
    xml.lastmod(Time.zone.now.strftime("%Y-%m-%d"))
  }
}