Sitemap Generation in Rails

routes.rb

#...

match 'sitemap.xml' => 'sitemap#sitemap'

#...

sitemap_controller.rb

class SitemapController < ApplicationController
  def sitemap
    full_url = "/public/sitemap.xml"
    out = Net::HTTP.get_response("<your_cdn>",full_url)
    render xml: out.body
  end
end

sitemap_worker.rb

class SitemapWorker
  include Sidekiq::Worker
  
  def perform()
    xml = Builder::XmlMarkup.new

    xml.instruct!
    xml.urlset "xmlns" => "http://www.sitemaps.org/schemas/sitemap/0.9" do
      posts = Page.where(sitemap: true).all
      posts.each do |post|
        xml.url do
          xml.loc ...
          xml.lastmod ...
          xml.changefreq ...
          xml.priority ...
          #...
        end
      end
      #...
    end

    xml_data = xml.target!
    sitemap = File.new(Rails.root.join('public/sitemap.xml'), "w")
    sitemap.write(xml_data)
    sitemap.close

    #...
    # Upload sitemap to some CDN
    #...
    end
  end
end