Transfer BLOB to Amazon S3 with Paperclip

gistfile1.rb

# loop on something .each do |my_model|
  blob_to_file(my_model.blob_image) do |image_file|
    my_model.update_attributes(s3_image: image_file)
  end
# end

def blob_to_file(blob)  
  tfile = Tempfile.new('blob_to_file')
  tfile.write(blob.force_encoding("UTF-8"))
  yield(tfile) if block_given?
  tfile.close
end