# Gemfile

gem 'big_sitemap'

# lib/tasks/sitemap.rake

require '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

  end

end

rake custom:sitemap