#1039: TypeError when evaluating FieldStorage object as boolean
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Reporter: L33tminion | Owner: anonymous
Type: defect | Status: new
Priority: normal | Milestone:
Component: Widgets | Version: 0.9a6
Severity: normal | Keywords:
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Problem: The `cgi.FieldStorage` object (call it `file`) generated by
`FileField` never has its `list` data member set to something meaningful.
As a result, trying to evaluate it as a boolean causes a `TypeError` (it
calls `len(file)` which in turn calls `len(file.keys())`, and
`file.keys()` throws a `TypeError` because `file.list` is `None`).
So code of this sort doesn't work:
{{{
class MyController(RootController):
@expose(...)
def upload(self,file=None,...):
if file:
<do stuff with the file...>
}}}
Solution: Make sure `file.list` is set so that the `FieldStorage` object
evaluates to true unless it's empty.
Version: I'm working with Turbogears from SVN trunk, r1629.
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Ticket URL: <http://trac.turbogears.org/turbogears/ticket/1039>
TurboGears <http://www.turbogears.org/>
TurboGears front-to-back web development
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