Django: raise ValidationError doesn't work - django

Question

Anyone who can explain me, why my ValidationError in my form doesn't work? I can see "Test" in my terminal, but the ValidationError doesn't show. I am happy to share the full code, but maybe the mistake already lies in the snippet below?
def clean_ticket(self):
ticket = self.cleaned_data['ticket']
if not self.event == ticket.event:
print("Test")
raise forms.ValidationError(
_("The ticket you chose doesn't belong to your event."),
code='ticket_belongs_to_event_validation',
)
return ticket
Full length code:
class ReserveForm(forms.ModelForm):
"""
* Pass inital tickets into form.
* Check if quantity is lower than defined max qty per ticket.
* Check if quantity is available.
* Clean function for quantity field.
"""
class Meta:
model = ReservedItem
fields = ['ticket', 'quantity']
def __init__(self, organizer, event, *args, **kwargs):
self.organizer = organizer
self.event = event
self.ticket = kwargs['initial']['ticket']
super().__init__(*args, **kwargs)
self.fields['ticket'].widget = forms.HiddenInput()
self.fields['quantity'].widget.attrs['placeholder'] = '0'
self.fields['quantity'].widget.attrs['class'] = 'form-control' # TODO Marc
def check_if_qty_lower_than_max_qty_per_ticket(self, new_added_quantity, max_qty_per_ticket):
if new_added_quantity and new_added_quantity > max_qty_per_ticket:
raise forms.ValidationError(
_("You can only buy %(max_quantity)s tickets per ticket type."),
code='max_qty_per_ticket',
params={'max_quantity': max_qty_per_ticket},
)
def check_if_qty_is_available(self, new_added_quantity):
ticket_pk = self.ticket.pk
ticket_name = self.ticket.name
max_quantity = self.ticket.quantity
# Check OrderItem
order_items_qty = OrderItem.objects.filter(
ticket__pk=ticket_pk
).aggregate(Sum('quantity'))
# Check ReservedItem within the last x minutes
time_threshold = timezone.now() - timedelta(minutes=settings.MINUTES_TICKET_RESERVATION)
reserved_items_qty = ReservedItem.objects.filter(
ticket__pk=ticket_pk,
created__gt=time_threshold,
).aggregate(Sum('quantity'))
# Calculate reserved quantity and new quantity
order_items_qty = order_items_qty['quantity__sum']
reserved_items_qty = reserved_items_qty['quantity__sum']
order_items_qty = 0 if not order_items_qty else order_items_qty
reserved_items_qty = 0 if not reserved_items_qty else reserved_items_qty
qty_reserved = order_items_qty + reserved_items_qty
new_quantity = qty_reserved + new_added_quantity
# Validation
if new_quantity > max_quantity:
tickets_left_total = max_quantity - qty_reserved
raise forms.ValidationError(
_("%(ticket_name)s: There are not enough tickets left. Maximum you can choose is %(value)s."),
code='qty_available',
params={'ticket_name': ticket_name, 'value': tickets_left_total},
)
def clean_ticket(self):
ticket = self.cleaned_data['ticket']
if not self.event == ticket.event:
print("Test")
raise forms.ValidationError(
_("The ticket you chose doesn't belong to your event."),
code='ticket_belongs_to_event_validation',
)
return ticket
def clean_quantity(self):
new_added_quantity = self.cleaned_data['quantity']
if new_added_quantity:
self.check_if_qty_lower_than_max_qty_per_ticket(
new_added_quantity=new_added_quantity,
max_qty_per_ticket=self.organizer.max_qty_per_ticket,
)
self.check_if_qty_is_available(
new_added_quantity=new_added_quantity,
)
# Always return a value to use as the new cleaned data, even if
# this method didn't change it.
return new_added_quantity