move_to_s3

 def move_to_s3
     temp_path = attachment.path
     temp_file = attachment.to_file # Paperclips way of getting a File object for the attachment

     # Save it as a regular attachment
     # this will save to S3
     s3_upload = Upload.find(id) # Same db record but we need the S3 version
     s3_upload.attachment = temp_file  # reset the file - it will assume its a new file
     s3_upload.save!             # Paperclip will upload the file on save

     # Delete the temporary file when we are done
     temp_file.close
     File.delete(temp_path)
   end