Implementation of sitemap generator for engine ( use gem SitemapGenerator )

application.rb

# STEP 3
# in application.rb of your main application add
require "fortuna/sitemap"

# and then you can use it from anywhere

# [1] Example from console, generate sitemap for engine:
>> Fortuna::Sitemap.new
# In '/home/rossmari/Projects/ebox/public/':
#  Fortuna::Girl Load (0.8ms)  SELECT "fortuna_girls".* FROM "fortuna_girls"
# + sitemap.xml                                              5 links /    1.43 KB
# Sitemap stats: 5 links / 1 sitemaps / 0m00s

# [2] Example from main application sitemap.rb
SitemapGenerator::Sitemap.compress = false
SitemapGenerator::Sitemap.create(default_host: 'http://www.ebox.ru', filename: :sitemap) do
  
  # generate content for models of main application
  Publication.find_each do |publication|
    add admin_publication_path(publication), lastmod: publication.updated_at
  end

end

# run Fortuna engine sitemap generator
Fortuna::Sitemap.new

engine_sitemap.rb

# STEP 1
# Fortuna engine sitemap generator class
module Fortuna
  class Sitemap
    # also specify sitemap file name unique for this engine
    def initialize
      
      SitemapGenerator::Sitemap.create(default_host: 'http://www.ebox.ru/fortuna/', filename: :fortuna_sitemap) do

        Girl.find_each do |girl|
          add Engine.routes.url_helpers.admin_girl_path(girl), lastmod: girl.updated_at
        end

      end
    end
  end
end

fortuna.rb

# STEP 2
# require sitemap generator class in engine to use it from main application

require "fortuna/engine"
require "fortuna/engine_sitemap"

module Fortuna
end