How to update multiple objects by one html request? - python-3.7

Question

I have a problem and can't find a decision.
I need to update a value for several objects by one form. If I did it one by one, without submit button it works fine. But I want to do it by click to one button.
My HTML form:
<form method="post" action="{% url 'installmentreport-update' %}">
{% for installmentreport in installment.installmentreport_set.all %}
<tr>
<td class="align-middle" style="text-align:center">{{installmentreport.title}}</td>
<td class="align-middle" style="text-align:center">
{% csrf_token %}
<input type="number" name='spent' value={{installmentreport.spent}} placeholder={{installmentreport.spent}} size="8">
<input type="hidden" name='id' value={{installment.id}}></td>
<input type="hidden" name='pk' value={{installmentreport.id}}>
</tr>
{% endfor %}
<td></td>
<td class="align-middle" style="text-align:center"><input type="submit" class="btn btn-warning" name="submit" value="Update"></form>
Views:
class InstallmentReportUpdate(LoginRequiredMixin,PermissionRequiredMixin,UpdateView):
model = InstallmentReport
permission_required = 'catalog.can_change_program'
fields = ['spent']
def get_object(self):
pks = self.request.POST.getlist('pk')
for pk in pks:
return InstallmentReport.objects.get(pk=pk)
def form_valid(self, form):
if self.request.method == 'POST':
spents = self.request.POST.getlist('spent')
if form.is_valid():
for spent in spents:
instance = form.save(commit=False)
form.instance.spent = spent
instance.save()
return super().form_valid(form)
def get_success_url(self):
id = self.request.POST.get('id')
return reverse('installment-detail-owner', args=[str(id)])
I use Python3.7 and Django2.2

Answer 1

I did it!
Views:
def get_object(self):
pks=self.request.POST.getlist('pk')
spents = self.request.POST.getlist('spent')
for pk, spent in zip(pks,spents):
print(pk)
print(spent)
InstallmentReport.objects.filter(pk=pk).update(spent=spent)
return InstallmentReport.objects.get(pk=pk)