So how does it work for other form elements? I'm guessing they are stored
in session. So the way to go would be to store the uploaded file in session
too and then on form resubmission check what to display. If file is in
session the input field should look as on update of an existing object
(i.e. having a link to a file next to it).
So having a controller as below, we would need to store file on error but
also read it to form.vars on validation:
def validate(form):
# read file from session
if form.vars.file is None and session.file:
form.vars.file = session.file
def test():
form = SQLFORM.factory(
Field('file', 'upload'),
Field('name', requires=IS_NOT_EMPTY()))
if form.process(onvalidation=validate).accepted:
response.flash = 'OK'
# delete session object
session.forget(response)
elif form.errors:
response.flash = 'errors'
# store file in session
session.file = form.vars.file
return dict(form=form)
Unfortunately this doesn't work as file objects cannot be pickled. Any
other ideas? Maybe mocking the CGI file with StringIO?
