asset fingerprinting on S3

[ipster]

Is there an easy way to use filename based asset fingerprinting in
carrierwave on amazon S3? Paperclip recently added this
functionality: http://mike.bailey.net.au/blog/?p=31

If I do this manually and I override the filename attribute to include
a MD5 hash, for example, will recreate_versions! delete old versions
of the file when I reprocess?

Thanks!

[Jonas Nicklas]

The filename method is only used when uploading, it shouldn't return
anything random as it may be called multiple times dring the process,
but it shouldn't be a problem if it returns, say the current date.

/Jonas

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[Mat]

I think that's a really important feature when using long expiry times
to use caching (which'll save you money on s3).
If anybody has already implemented it, please share it!