Django FormWizard Dynamically Alter form_list

问题:

I'm having some issues with the form wizard, that maybe someone can shed some light on. According docstring in the method process_step: I can "dynamically alter self.form_list". So, based on my project needs, I'm appending forms to the form_list. The forms I'm appending contain questions and answers: http://dpaste.com/hold/152201/

The issue is that when 2 people hit the formwizard at the same time, they start to see each others questions and answers. I guess I don't understand how process_step suggests I can dynamically alter the form_list, when by doing so I'm modifying the form list of another user. Is the form_list a shared object among visitors hitting the formwizard url defined in urls.py? I've seen this issue under apache2/prefork/worker/mod_wsgi, and while running the app with runserver.

回答1:

How do you use FormWizard? If you're putting it in urls.py like docs says then it could be cached, i had that issue couple of times. Just put it in a view like:

def my_view(request):
    return FormWizard(request)

UPDATE: Example from real

def registration_wizard(request, template_name=None):
    rw = RegistrationWizard([RegistrationForm, 0])
    #hack formwizard to replace default template
    if template_name:
        rw.get_template = lambda x: template_name

    return rw(request)

here RegistrationWizard is a FormWizard subclass with dynamic form_list, [RegistrationForm, 0] is needed because if there's only one form at creation time, wizard won't get to form_list function. Template thing is pretty self-explanatory