Python 当我try 在django中更新模型时，模型表单数据不可见

所以这是the view :

def update_ticket(response,ticket_title):
  ticket = get_object_or_404(TicketsModel, title=ticket_title)
  ticket_form = AddTicketsForm(response.POST or None,instance=ticket,assigned_by=response.user)
  if 'return' in response.POST:
    return redirect('home', type_user=response.session.get('type_user'))
  if ticket_form.is_valid():
    ticket.ticket_creation_date = datetime.now()
    ticket_form.save()
    return redirect('home', type_user=response.session.get('type_user'))

return render(response, "template/testapp/update_ticket.html", {'ticket_title': ticket.title, 'ticket_form': ticket_form})

问题是，当我呈现表单时，我看不到输入中的数据，但如果我删除了AddTicketsForm()中的"response.POST"，我可以看到数据，但我不能更新任何东西

here is the html content

<h2>Update Ticket</h2>
        <form action="{% url 'update_ticket' ticket_title=ticket_title %}" method="post">
            {% csrf_token %}
            {{ ticket_form.as_p }}
            <button type="submit" name="save" id="regDirect" >Save</button>
            <button type="submit" name="return">Return</button>
        <form/>