Image attachment in mail with rails3

Rails
1

yes this will send one mail with attachment of image.png. But when i
open
or download that image, that is empty.?

imageurl =

require ‘open-uri’
class UserMailer < ActionMailer::Base
default :from => “[email protected]”

def welcome_email(imageurl,mailid)

attachments['QR.png'] = {:mime_type => 'image/png',
                                 :content =>

open(URI.parse(imageURL))}
mail(:to => mailid,
:subject => “Code”,
:body => “Code”)
end
end

Thanks
vishnu