Tempfile みたいにFileを取得したい場合ではなく、ファイル名を取得したい場合の方法。
base_name = "image" # 必要に応じてディレクトリパスも含める
ext_name = "jpg"
Dir::Tmpname.make_tmpname(base_name, ext_name) => "image20160902-29100-1xxd3n7-jpg"
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