在 django 中使用表中的表单进行多表单视图表单验证时出现问题

Question

正如标题所说，我遇到了表单验证问题。表格和表格似乎都“知道”正确的值，但是当它到达视图时，验证失败。

我有工作、成本和供应商，它们都是相互关联的。我要验证的表格是与特定工作相关的成本表的一部分，我要更新的字段是供应商字段，通过下拉菜单，成本表的每一行，带有通过 Javascript 一次提交所有表单的单个更新按钮。

通过打印语句进行大量故障排除，表格和表格似乎都能够打印正确的成本和供应商，但是在验证时，我一直被告知“成本”字段是必填字段，所以我猜这是没有从表单中收到 Cost 对象。

被困在这个问题上太久了，我会很感激一些帮助。

这里的观点：

class CostCreateView(SuccessMessageMixin, SingleTableMixin, CreateView):
    model = Cost
    fields = ['vendor','description','amount','currency','invoice_status','notes']
    template_name = "main_app/cost_form.html"
    table_class = CostTable
    simple_add_vendor_form = AddVendorToCostForm
    cost_form = CostForm
    update_vendor_form = UpdateVendorForm

def get_context_data(self, **kwargs):
    context = super().get_context_data(**kwargs)
    self.object=None
    currentJob = Job.objects.get(pk=self.kwargs['pk'])
    context['currentJob'] = currentJob
    context['table'] = self.table_class(currentJob.cost_rel.all())
    context['simple_add_vendor_form'] = self.simple_add_vendor_form
    context['update_vendor_form'] = self.update_vendor_form
    context['cost_form'] = self.cost_form
    context['vendors'] = Vendor.objects.filter(jobs_rel = currentJob)
    return context

def post(self, request, *args, **kwargs):
    self.object = None
    context = self.get_context_data(**kwargs)
    currentJob = Job.objects.get(pk=self.kwargs['pk'])
    ...
    elif 'update-cost-vendor' in request.POST:
        currentJob = Job.objects.get(pk=self.kwargs['pk'])
        table = self.table_class(currentJob.cost_rel.all())
        forms = []
        for i, cost in enumerate(table.data):
            prefix = f'form-{i}'
            form = self.update_vendor_form(request.POST, prefix=prefix, cost=cost, initial={'cost': cost})
            if form.is_valid():
                # print(f'cost: {cost}')
                # print(f'vendor: {cost.vendor}')
                # print(f'cleaned: {form.cleaned_data}')
                cost.vendor = form.cleaned_data['vendor']
                cost.save()
            else:
                print('went down to the bottom else')
                for form in forms:
                    print(f'{prefix}: {form.errors}')
                    print(f'{prefix}: {form.non_field_errors}')
            forms.append(form)
        return redirect('main_app:cost-add', pk=self.kwargs['pk'])

形式：

class UpdateVendorForm(forms.Form):
    vendor = forms.ModelChoiceField(queryset=Vendor.objects.all(), required=False)
    cost = forms.ModelChoiceField(queryset=Cost.objects.all(), widget=forms.HiddenInput)

def __init__(self, *args, cost=None, **kwargs):
    super().__init__(*args, **kwargs)
    cost = self.initial.get('cost')
    # print(f'cost from the form side: {cost}')
    initial = kwargs.get('initial', {})
    initial['cost'] = cost
    kwargs['initial'] = initial

桌子：

class CostTable(tables.Table):
    edit = tables.TemplateColumn(verbose_name='', template_name="main_app/tables_costsheet_edit_column.html")
    job = tables.Column(accessor='job.job_name')

def render_vendor(self, value, record):
    form = UpdateVendorForm(initial={'vendor':value, 'cost':record })
    return form.as_p()

class Meta:
    model = Cost
    order_by = 'vendor_initials'
    template_name = "django_tables2/bootstrap5.html"
    fields = ("job", "vendor", "description", "amount", "invoice", "PO_number", "edit", "id")

模型关系：

class Cost(models.Model):
    ...
    vendor = models.ForeignKey(Vendor, on_delete=models.SET_NULL, null=True, blank=True,)
    job = models.ForeignKey('Job', on_delete=models.CASCADE, related_name='cost_rel', 

class Job(models.Model):
    ....
    vendors = models.ManyToManyField(Vendor, verbose_name='vendors involved', blank=True, related_name = 'jobs_rel')
    ....

让我知道你还需要知道什么。在接下来的几天里很难回复，但会提供我能提供的信息。