module Enjoy::Seo::SitemapDataField
  extend ActiveSupport::Concern
  FIELDS = [:sitemap_show, :sitemap_lastmod, :sitemap_changefreq, :sitemap_priority]

  included do
    has_one :sitemap_data, as: :sitemap_data_field, autosave: true, class_name: "Enjoy::Seo::SitemapData"
    accepts_nested_attributes_for :sitemap_data

    delegate *FIELDS, to: :sitemap_data
    delegate *(FIELDS.map {|f| "#{f}=".to_sym }), to: :sitemap_data

    alias sitemap_data_without_build sitemap_data
    def sitemap_data
      sitemap_data_without_build || build_sitemap_data
    end
  end
end