I need to create registration form for an event. Each person that register can

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Asked: May 29, 20262026-05-29T18:22:28+00:00 2026-05-29T18:22:28+00:00

I need to create registration form for an event. Each person that register can

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I need to create registration form for an event. Each person that register can bring guests. I want to register everything in one page. To do that I use a view with 1 RegistrationForm and X GuestForms. In my models, I have a Registration and Guest class I used to create the two forms with ModelForm.

The problem is that a GuestForm is not required to be filled (you don’t have to bring guests).

def register_form(request):
  error = False
  if request.method == 'POST':
    register = RegistrationForm(request.POST, instance=Registration() )
    guests = [GuestForm(request.POST, prefix=str(x), instance=Guest()) for x in range(MAXGUESTS)]
    if register.is_valid():
        print("register is valid")

        for guest in guests:
            if guest.is_valid():
                print("guest is valid")
            else:
                print("guest is not valid") # always when empty form
                error = True
    else:
        print("register is not valid")
        error = True

    if not error:
       ... # save the form in the database

  register = RegistrationForm(instance=Registration())
  guests = [GuestForm(prefix=str(x), instance=Guest()) for x in range(MAXGUESTS)]
  return render_to_response('register.html',{
        'form': register,
        'max_guests': MAXGUESTS,
        'guests': guests,
        'error': error,
        })

So I need to set a form as optional and be able to differentiate when the whole form is empty and when there is an error. Any idea how ?

Thank you

Solution

def register_form(request):
  GuestFormSet = modelformset_factory(Guest, exclude=('register',))
  error = False
  if request.method == 'POST':
    register = RegistrationForm(request.POST, instance=Registration() )
    guests = GuestFormSet(request.POST)
    if register.is_valid():
        print("register is valid")

        for guest in guests:
            if guest.is_valid():
                print("guest is valid") # even if some forms are empty
            else:
                print("guest is not valid")
                error = True
    else:
        print("register is not valid")
        error = True

    if not error:
       ... 
       # save the form in the database
       return something

  else:
      register = RegistrationForm(instance=Registration())
      guests = GuestFormSet(queryset=Guest.objects.none())
  return render_to_response('register.html',{
        'form': register,
        'max_guests': MAXGUESTS,
        'guests': guests,
        'error': error,
        })