Zipping files contained in a dir (rubyzip)

Rails
1

hey so I’m trying to zip all the files contained in a directory
(RubyZip). heres what I have:

  def bundle
       #create the ZIPfile with the title of (:id).zip
  bundle_filename = "public/attachments/#{self.id}/#{self.id}.zip"

       #open the ZIPfile in order to add items in
  Zip::ZipFile.open(bundle_filename, Zip::ZipFile::CREATE) {
   |zipfile|
     Dir.foreach("public/attachments/#{self.id}") do |item|
     t = File.open(item)
     zipfile.add(t, "public/attachments/#{self.id}")
     end
   }

      #change permissions on ZIPfile
   File.chmod(0644, bundle_filename)
    self.save
   end

This successfully executes the first line and creates the zip file with
the correct name but it is not adding to the zip file all the files
contained in that directory. Any Ideas?