class Ticket(models.Model):
    user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
    designation = models.CharField(max_length=255, blank=True, null=True)

def Index(request):
    ticket = Ticket.objects.all()
    for t in ticket:
      id = len(str(t.id))
      if id == 1:
        t.designation = "#" + str("0000") + str(t.id)
      elif id == 2:
        t.designation = "#" + str("000") + str(t.id)
      elif id == 3:
        t.designation = "#" + str("00") + str(t.id)
      elif id == 4:
        t.designation = "#" + str("0") + str(t.id)
      else:
        t.designation = "#" + str(t.id)
    context = {'ticket':ticket}
    return render(request, 'ticketsystem/index.html', context)

class Ticket(models.Model):
    user = models.ForeignKey(User, on_delete=models.SET_NULL, null=True)
    ticketkennung = models.CharField(max_length=255, blank=True, null=True)

    def save(self):
        id = len(str(id))
        if id == 1:
            designation = "#" + str("0000") + str(id)
        elif id == 2:
            designation = "#" + str("000") + str(id)
        elif id == 3:
            designation = "#" + str("00") + str(id)
        elif id == 4:
            designation = "#" + str("0") + str(id)
        else:
            designation = "#" + str(id)
        super().save()