Allow organizers to submit payment forms

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/signals.py

@@ -49,5 +49,5 @@ def update_payment_amount(instance, **_):
     """
     if instance.type == 'free' or instance.type == 'scholarship':
         instance.amount = 0
-    elif instance.pk:
+    elif instance.pk and instance.registrations.exists():
         instance.amount = instance.registrations.count() * instance.tournament.price

registration/views.py

@@ -460,7 +460,7 @@ class PaymentUpdateView(LoginRequiredMixin, UpdateView):
         context['title'] = _("Update payment")
         # Grouping is only possible if there isn't any validated payment in the team
         context['can_group'] = all(p.valid is False for reg in self.object.team.students.all()
-                                   for p in reg.payments.filter(valid=self.object.valid).all())
+                                   for p in reg.payments.filter(final=self.object.final).all())
         context['bank_transfer_form'] = PaymentForm(payment_type='bank_transfer',
                                                     data=self.request.POST or None,
                                                     instance=self.object)
@@ -480,8 +480,8 @@ class PaymentUpdateView(LoginRequiredMixin, UpdateView):
         if self.request.user.registration.participates:
             if old_instance.valid is not False:
                 raise PermissionDenied(_("This payment is already valid or pending validation."))
-            else:
+        if old_instance.valid is False:
-                form.instance.valid = None
+            form.instance.valid = None
         if old_instance.receipt:
             old_instance.receipt.delete()
             old_instance.save()
@@ -504,7 +504,7 @@ class PaymentUpdateGroupView(LoginRequiredMixin, DetailView):
             return self.handle_no_permission()
 
         if any(p.valid is not False for reg in payment.team.students.all()
-               for p in reg.payments.filter(valid=payment.valid).all()):
+               for p in reg.payments.filter(final=payment.final).all()):
             raise PermissionDenied(_("Since one payment is already validated, or pending validation, "
                                      "grouping is not possible."))
         return super().dispatch(request, *args, **kwargs)