Just like the Django CBV CreateView, except allows population (and override) of the instance sent to the form

views.py

class InstanciatedCreateView(SingleObjectTemplateResponseMixin, ModelFormMixin, ProcessFormView):
    template_name_suffix = '_form'
    
    def get_object(self):
        return self.model()
    
    def get(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super(InstanciatedCreateView, self).get(request, *args, **kwargs)
        
    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super(InstanciatedCreateView, self).post(request, *args, **kwargs)


class OrderView(InstanciatedCreateView):
    model = Order
    
    def get_object(self):
        return Order(user=self.request.user)