```ruby
xml.instruct! :xml, :version=>"1.0", :encoding=>"UTF-8"

xml.rss "version" => "2.0", "xmlns:g" => "http://base.google.com/ns/1.0" do
  xml.channel do
    xml.title Spree::GoogleMerchant::Config[:google_merchant_title]
    xml.description Spree::GoogleMerchant::Config[:google_merchant_description]
    
    production_domain = Spree::GoogleMerchant::Config[:production_domain]
    xml.link production_domain
    
    @products.each do |product|
      xml.item do
        xml.id product.id.to_s
        xml.title product.name
        xml.description CGI.escapeHTML(product.description.strip_html_tags) unless product.description.nil?
        xml.link production_domain + 'products/' + product.permalink
        xml.tag! "g:mpn", product.sku.to_s
        xml.tag! "g:id", product.id.to_s
        xml.tag! "g:price", product.price
        xml.tag! "g:condition", "new"
        xml.tag! "g:image_link", production_domain.sub(/\/$/, '') + product.images.first.attachment.url(:product) unless product.images.empty?
      end
    end
  end
end
```

Add shipping to RSS feed.
user
```ruby
xml.instruct! :xml, :version=>"1.0", :encoding=>"UTF-8"

xml.rss "version" => "2.0", "xmlns:g" => "http://base.google.com/ns/1.0" do
  xml.channel do
    xml.title Spree::GoogleMerchant::Config[:google_merchant_title]
    xml.description Spree::GoogleMerchant::Config[:google_merchant_description]
    
    production_domain = Spree::GoogleMerchant::Config[:production_domain]
    xml.link production_domain
    calculator = Spree::Country.find_by_iso('US').zone.shipping_methods.first.calculator

    @products.each do |product|
      xml.item do
        xml.id product.id.to_s
        xml.title product.name
        xml.description CGI.escapeHTML(product.description.strip_html_tags) unless product.description.nil?
        xml.link production_domain + 'products/' + product.permalink
        xml.tag! "g:mpn", product.sku.to_s
        xml.tag! "g:id", product.id.to_s
        xml.tag! "g:price", product.price
        xml.tag! "g:condition", "new"
        xml.tag! "g:availability", "in stock"
        xml.tag! "g:shipping", calculator.compute(product)
        xml.tag! "g:image_link", product.images.first.attachment.url(:product) unless product.images.empty?
      end
    end
  end
end
```
assistant