ruby on rails - File rename while uploading -

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i uploading files amazon s3 rails app , working fine, however, want know how can append string file uploaded. example if user has chosen file abc.jpg, need append header_abc.jpg. how can achieve this?

path = picture.attachment.path()  new_file_name = "header_" + picture.attachment_file_name  fileutils.move(path, file.join(file.dirname(path), new_file_name))  picture.attachment_file_name = new_file_name picture.save

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