>
> my application is generating pdfs which should be available via the 
> normal web2py download controller. 
> I realize, that the file in the uploads/-directory is named like: 
>
>     <tablename>.<fieldname>.<something>.<binascii.hexlify(filename)>.pdf 
>
> But what is the something?
>

Looks like it's the last 16 (non-hyphen) characters of a uuid: 
http://code.google.com/p/web2py/source/browse/gluon/dal.py#7897.

Note, for manual uploads, you can call the field's store() method directly: 
http://web2py.com/books/default/chapter/29/6#Manual-uploads.

Anthony

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