# Gemfilegem ‘big_sitemap‘# lib/tasks/sitemap.rakerequire ‘big_sitemap‘namespace :custom do  desc "Generate sitemap"  task :sitemap => :environment do    include Rails.application.routes.url_helpers    sitemap_options = {      document_root: Rails.root.join(‘public‘),      url_options: { host: ‘example.com‘ },      ping_google: true,      ping_bing: true,      gzip: true    }    if Rails.env.development?      sitemap_options = {        document_root: Rails.root.join(‘public‘),        url_options: { host: ‘localhost‘, port: 3000 },        ping_google: false,        ping_bing: false,        gzip: false      }    end    BigSitemap.generate(sitemap_options) do      add root_path, change_frequency: ‘daily‘, priority: 1.0      Shop.all.each do |shop|        add shop_path(shop), change_frequency: ‘daily‘, priority: 0.5      end    end  endend

rake custom:sitemap