Save RubyZip to Paperclip

gistfile1.rb

buffer_string = Zip::OutputStream.write_buffer do |zos|
  zos.put_next_entry("FILENAME")
  zos.write FILE_DATA
end.string

file = StringIO.new(buffer_string)
file.class.class_eval { attr_accessor :original_filename, :content_type }
file.original_filename = "#{file_name}.zip"
file.content_type = "application/zip"

document = Document.new
document.attachment = file
document.save