Почему запрос xpath выводит 20 повторений?

(doc / "//div[@class="productlist"]//a[@class="product-name"]").each do |row|
product_link = (row / "./@href")
puts product_link

(doc / "//div[@class="productlist"]//a[@class="product-name"]").each do |row|
product_link = (row / "@href")
puts product_link

(doc / "//div[@class="productlist"]//a[@class="product-name"]/@href").each do |row|
product_link = row
puts product_link