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ActiveRecord :binary type のカラムを psql でテキストに変換して見る

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アップロードしたファイルを保存したい場合などはエンコーディングの問題のない binary (postgresql だと bytea) で保存するといいのですが、psql コマンドから中身をテキストとして見たい場合には

SELECT encode(bin,'escape') FROM t;
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