Rails Nokogiri get xml from url

I recently learned how to import XML feeds into rails using nokogiri with the following code.

Instead of downloading my feed from an URL, I have the option to access it directly from an URL.

let's say that URL is `www.feedurl.com'

how would I update the below code to get it from that URL:

class Product < ApplicationRecord 
    def self.xml_parser
        doc = Nokogiri::XML(open("#{Rails.root}/datafeed.xml"))
        frothieproducts = doc.xpath('//FeedItems/FeedItem')
        frothieproducts.map do |feeditem|
            product = Product.new
            product.product_name = feeditem.xpath('Name').text
            product.product_description = feeditem.xpath('Description').text
            product.product_link = feeditem.xpath('Url').text
            product.save!
        end
    end
end

If you want to access the xml data from www.feedurl.com you can change this line:

doc = Nokogiri::XML(open("#{Rails.root}/datafeed.xml"))

to

doc = Nokogiri::XML(open("http://www.feedurl.com"))