(Noob) Image upload: rename file

[Florian Schaf]

Hi!
I'm building an app where the user can upload images. this works fine and
the uploaded file is copied from the temp directory to an
MerbRoot/uploads/id directory. my problem is that the filename is something
like Merb.5288.0. How can I rename it? my model is available at
pastie.<http://pastie.caboo.se/160143>
I'm sure this question is not too sophisticated (-;
regards
flo schaf

PS: The value of the size field is always 0. why? (thats not that important)
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