def getFileSystemPath(self, instance, item):
"""Returns the file system path (with filename) where to store
a instance field.
"""
path = ExternalStorage.getFileSystemPath(self, instance, item)
# try to find an appropriate extension
try:
basename, extension = os.path.splitext(getattr(instance.REQUEST.form.get('%s_file' % item), 'filename', self.getStorageItem(instance, item).get('filepath')))
path = '%s%s' % (path, extension)
except:
pass
return path
