>
> db.image.thumb.compute=lambda r:THUMB(r['file'])
>
> def update_images():
>     rows=db(db.image).select()
>     for row in rows:
>         row.update(title=row.title)
>     db.commit()
>

Well, in this case, you update the "title" field, but the compute depends 
on the "file" field, so there would be nothing to update.

Anthony

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