You ran into a bug (imho) that has existed in python since 2001 (at least).
http://bugs.python.org/issue444913 Now it's preserved for backwards compatibility. On Thursday, May 30, 2013 2:06:20 AM UTC-7, Joe Barnhart wrote: > > I've had the most awful time trying to get the actual filename of an > uploaded file to appear in my database. I've gone over and over the > advice, but it has never worked for me. I was beginning to suspect evil > spirits in my code when I ran across the problem... > > cgi.FieldStorage does NOT behave like other Python variables in that it > doesn't resolve to True if the object contains data. It resolves to False > ALL THE TIME, whether it has data or not. > > I was dutifully following advice and had code that looked like: > > > if request.vars.upload: > form.vars.filename = request.vars.upload.filename > > > But guess what? The code inside "if" NEVER RUNS. > > For now I've worked around it by using the method "has_key()" on the > cgi.FieldStorage object: > > > if request.vars.has_key('upload'): > form.vars.filename = request.vars.upload.filename > > > > And this works. > > The "proper" fix is probably to modify cgi.FieldStorage so that is > resolves to True if it has data and False if empty, like all other Python > objects. But I thought I'd pass along my epiphany in case others are > wondering if their code is inhabited by evil spirits. -- --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
