Wrong Number of Arguments - ruby-on-rails

Question

I understand what causes the wrong number of arguments error but my code doesn't pass any parameters to initialize any of the classes so I'm not sure at all why my code is giving me this error. I'm also pretty new to Ruby on Rails so that doesn't help things. My code is below:
def create_google_file
#products = Product.find(:all)
file = File.new('dir.xml','w')
doc = REXML::Document.new
root = REXML::Element.new "rss"
root.add_attribute("xmlns:g", "http://base.google.com/ns/1.0")
root.add_attribute("version", "2.0")
channel = REXML::Element.new "channel"
root.add_element channel
title = REXML::Element.new "title"
title.text = "Sample Google Base"
channel.add_element title
link = REXML::Element.new "link"
link.text = "http://base.google.com/base/"
channel.add_element link
description = REXML::Element.new "description"
description.text = "Information about products"
channel.add_element description
#products.each do |y|
item = channel.add_element("item")
id = item.add_element("g:id")
id.text = y.id
title = item.add_element("title")
title.text = y.title
description = item.add_element("description")
description.text = y.description
googlecategory = item.add_element("g:google_product_category")
googlecategory.text = y.googlecategory
producttype = item.add_element("g:product_type")
producttype.text = y.producttype
link = item.add_element("link")
link.text = y.link
imglink = item.add_element("g:image_link")
imglink.text = y.imglink
condition = item.add_element("condition")
condition.text = y.condition
availability = item.add_element("g:availability")
availability.text = y.availability
price = item.add_element("g:price")
price.text = y.price "USD"
gtin = item.add_element("g:gtin")
gtin.text = y.gtin
brand = item.add_element("g:brand")
brand.text = y.brand
mpn = item.add_element("g:mpn")
mpn.text = y.mpn
expirationdate = item.add_element("g:expiration_date")
expirationdate.text = y.salepricedate
end
doc.add_element root
file.puts doc
file.close
end
The error I'm getting is:
ArgumentError in ProductsController#create_google_file
wrong number of arguments (1 for 0)

Answer 1

At the request of the poster, I am putting my comments in to an answer:
Based purely on the consistency of the other lines, but without knowing which line is actually failing, it may be this part: price.text = y.price "USD". Is y.price a method that takes in a parameter? Is it defined as def price(type) or something? If not, if it doesn't take any parameters, then it's because you're not supposed to send any parameters to that method. It looks like it's just a getter.
#FranklinJosephMoormann As I suspected, that's the line. Were you trying to make a string like "4.50 USD"? Then you probably wanted: price.text = "#{y.price} USD". That will take the result of y.price and put it in a string, and allow you to keep typing more in the string. It's called string interpolation.