Django, Pasando dinamicamente plantillas y formularios a una WizardView.

wizard.py

def get_form_list(request):
    form_list = [
        ("categories", forms.CategoriesForm),
        ("description", forms.CategoriesForm)]
    templates = {
        "categories": "categories.html",
        "description": "description.html"}
    if not request.user.is_authenticated():
        form_list.append(("register", forms.CategoriesForm))
        templates["register"] = "step-register.html"
    kwargs = {'templates': templates}
    return MySessionWizardView.as_view(form_list=form_list, **kwargs)(request)
    
    
class MySessionWizardView(SessionWizardView):

    templates = None
    file_storage = FileSystemStorage(
        location=os.path.join(settings.MEDIA_ROOT))
        
    def get_template_names(self):
        return [self.templates[self.steps.current]]

    def get_form(self, step=None, data=None, files=None):
        """
        cambiar la instancia de formulario dinamicamente
        a partir de los datos que entramos en el paso anterior
        'categories', 'description', 'register'
        """
        if step is None:
            step = self.steps.current
        # prepare the kwargs for the form instance.
        kwargs = self.get_form_kwargs(step)
        kwargs.update({
            'data': data,
            'files': files,
            'prefix': None,  # self.get_form_prefix(step, self.form_list[step]),
            'initial': None,  # self.get_form_initial(step),
        })
        if step == 'categories':
            form = forms.CategoriesForm
        elif step == 'description':
            kwargs.setdefault('instance', self.get_form_instance(step))
            category = self.get_cleaned_data_for_step('categories')['category']
            form = forms.DescriptionForm
        else:
            form = RegisterForm
        return form(**kwargs)
        
    def process_form_data(self, form_list):
        form_data = [form.cleaned_data for form in form_list]
        return form_data  

    def done(self, form_list, **kwargs):
        form_data = self.process_form_data(form_list)
        return render_to_response(
            'done.html',
            {'form_data': form_data},
            context_instance=RequestContext(self.request))