Other form elements aren't stored in the session -- when the form
submission comes in, they are in request.vars, and they can be moved to
form.vars and returned with the form (no need to put anything in the
session). The file itself, on the other, cannot be returned with the form,
so you have to store it on the server (on the file system or in the db --
or maybe you could serialize it somehow and put it in the session, though
not sure that's a good idea for large files).
Anthony
On Monday, December 5, 2011 11:58:41 AM UTC-5, Wikus van de Merwe wrote:
>
> 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?
>
