On Aug 3, 2009, at 8:33 AM, Jose wrote:
> I have just tried this in Windows XP(r1153) + python 2.5.x
>
> db.define_table('unatabla',
> Field('nombre'),
> Field('imagen', 'upload'),
> )
>
> The following mistake takes is produced when I do submit:
>
> Error traceback
> Traceback (most recent call last):
> File "E:\web2py2\gluon\restricted.py", line 178, in restricted
> exec ccode in environment
> File "E:/web2py2/applications/prueba/controllers/appadmin.py", line
> 255, in <module>
> File "E:\web2py2\gluon\globals.py", line 101, in <lambda>
> self._caller = lambda f: f()
> File "E:/web2py2/applications/prueba/controllers/appadmin.py", line
> 104, in insert
> if form.accepts(request.vars, session):
> File "E:\web2py2\gluon\sqlhtml.py", line 809, in accepts
> if not f:
> File "E:\Python25\lib\cgi.py", line 633, in __len__
> return len(self.keys())
> File "E:\Python25\lib\cgi.py", line 609, in keys
> raise TypeError, "not indexable"
> TypeError: not indexable
I took a quick look at the code behind this trace, and I can offer a
small clue. I don't know enough about what's going on to offer a
solution, but perhaps it'll ring a bell for someone who understands
the code better than I do.
Here's the code in the tree:
> elif field.type == 'upload':
> f = self.vars[fieldname]
> fd = fieldname + '__delete'
> if not f:
This used to be f == ''.
> if self.vars.get(fd, False) or not self.record:
> fields[fieldname] = ''
> else:
> fields[fieldname] = self.record[fieldname]
> continue
> elif not isinstance(f, (str, unicode)):
> (source_file, original_filename) = (f.file,
> f.filename)
> else:
> ### do not know why this happens, it should not
This comment bothers me, and I wonder if it might be related.
> (source_file, original_filename) = \
> (cStringIO.StringIO(f), 'file.txt')
> logging.warn('here')
> fields[fieldname] = field.store(source_file,
> original_filename)
> logging.warn('there')
> if field.uploadfield and not field.uploadfield==True:
> fields[field.uploadfield] = source_file.read()
> continue
>
In the failing case, f appears to be an instance of FieldStorage, from
cgi.py. It appears that Python implements "if not f" as "if not
len(f)". FieldStorage defines __len__ as "len(self.keys()), and that's
where we run into trouble.
def keys(self):
"""Dictionary style keys() method."""
if self.list is None:
raise TypeError, "not indexable"
keys = []
for item in self.list:
if item.name not in keys: keys.append(item.name)
return keys
And self.list is None unless one of two things happens:
if ctype == 'application/x-www-form-urlencoded':
self.read_urlencoded()
elif ctype[:10] == 'multipart/':
self.read_multi(environ, keep_blank_values, strict_parsing)
else:
self.read_single()
Only the first two calls (read_urlencoded() and read_multi()) set
self.list to a list. Otherwise it's None, and our 'if not f' will be
sent an exception.
If this case is expected, or at should be a detectable error
condition, then perhaps we should catch the exception and treat it as
a case of 'not f'. Or something. But as I say, I don't really know
enough about the intent of this code to go any farther.
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