There are plenty of examples of how to upload files in Pylons, but
none of them check if the user actually put a file in the form or
not. If they don't, the application breaks. Wonderful.
So, how do you check? Well, I'd expect this to work:
if not request.params['file']:
return "No file was uploaded"
Unfortunately, even if the file is there it evaluates to falsy.
print "True" if request.params['file'] else "False" # always False
I did find a reliable way to test it though:
if request.params['file'] == u'':
return "No file was uploaded"
Yeah, it comes out as an empty string if there's no file. Weird. Is
this a good enough check? Will it still act this way when proxied to
by different servers?
I'm really surprised I couldn't find this information elsewhere.
Should we add this to the tutorials?
http://wiki.pylonshq.com/display/pylonsdocs/Form+Handling
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