How to use CBV with form in Django?

Question

Django

Hello! I have code:

class OperationsList(object):
    model = Many
    earn = False
    cost = False
    title = ''
    summa = {}
    form = ''

    def get_queryset(self):
        qs = Many.objects.filter(users=self.request.user.id).order_by('-date')
        return qs

    def get_context_data(self, **kwargs):
        context = super(OperationsList, self).get_context_data(**kwargs)
        context['user_username'] = self.request.user.username
        context['e'] = self.earn
        context['c'] = self.cost
        context['title'] = self.title
        if self.form:
            context['form'] = self.form
        if self.summa['sum__sum'] is None:
            context['summa'] = 0
        else:
            context['summa'] = self.summa['sum__sum']
        return context

class EarnPeriods(OperationsList, FormMixin, ListView):
    form_class = forms.DateForm
    form = forms.DateForm
    template_name = 'period.html'
    context_object_name = 'earnings_list'
    earn = True
    now_date = datetime.date.today()
    date_start = now_date
    date_end = now_date

    def form_valid(self, form):
        self.date_start = form.clean['date_start']
        self.date_end = form.clean['date_end']
        return super(EarnPeriods, self).form_valid(form)

    def get_queryset(self):
        print(self.date_start)
        print(self.date_end)
        self.summa = super(EarnPeriods, self).get_queryset().filter(date__range=(self.date_start, self.date_end), sum__gt=0).aggregate(Sum('sum'))
        return super(EarnPeriods, self).get_queryset().filter(date__range=(self.date_start, self.date_end), sum__gt=0)

I recently studied Django and taught from a book in which there is not a single line about CBV, so now I have questions and incomprehensibility as I rewrite the code on CBV.
Question:
I want to make it so that when I click on the URL I have a form, and after submitting the data, the form and the list below it are displayed. But I don't know how to do it, and all I could achieve is that when I go to the URL, a form appears and a list below it, but when I submit it, it gives a 405 error. Please tell me how to do it right.

Answer 1

In the EarnPeriods class, you use inheritance from the ListView class, which does not support post requests https://docs.djangoproject.com/en/dev/ref/class-ba...
This class is only used to display a "list of objects".
And you send the form on the html-page with a post-request. Here is the 405 error.
In general, you have 3 options:
1) use a class that supports post requests. Any of these https://docs.djangoproject.com/en/dev/ref/class-ba... depending on what you need;
2) send the form in the template with a get request (only if this form receives and displays objects, and does not change them in the database);
3) write the methods you need yourself (including post()), but then it’s better to inherit from some common class like https://docs.djangoproject.com/en/dev/ref/class-ba...

Answer 2

405 - invalid method error. Maybe you should try adding the post method to the view manually and see if it reaches it? and explicitly specify an action for the form?