rails download remote file to temp file

require 'tempfile'
require 'open-uri'

def download(url)
  file = Tempfile.new(['foobar','.jpg'])
  file.binmode
  file.write(open(url).read)
  file.close
  return file.path
end

download("https://koenig-media.raywenderlich.com/uploads/2016/08/Puppy.jpg")