Django 如何覆盖 inlineformset_factory 中的子表单答案

【问题标题】：Django How to override a child form in inlineformset_factoryDjango 如何覆盖 inlineformset_factory 中的子表单
【发布时间】：2015-08-24 13:29:15
【问题描述】：

我正在尝试在我的子表单中覆盖概念查询集，以根据从 request.POST 获得的区域获取自定义列表概念，这是我的概念列表，我需要根据 POST 请求对其进行过滤，此列表是我的子表单 (InvoiceDetail) 的 fk。有可能有这些过滤器吗？

当我按照文档中所说的 initial=['concept'=queryset_as_dict] 传递初始数据时进行了一些测试后，它总是返回所有概念，但我在视图中打印相同的内容并且过滤器可以，但是当我渲染时就不行了模板，所以我读到我需要使用一些 BaseInlineFormset。所以当我测试时，我得到了不同的错误：

django.core.exceptions.ValidationError: ['ManagementForm data is missing or has been tampered with']
'InvoiceDetailFormFormSet' object has no attribute 'fields'

所以这是我的代码：模型.py

class ConceptDetail(CreateUpdateMixin): # here, is custom list if area='default' only returns 10 rows. 
    name = models.CharField(max_length=150)
    area = models.ForeignKey('procedure.Area')

class Invoice(ClusterableModel, CreateUpdateMixin): # parentForm
    invoice = models.SlugField(max_length=15)

class InvoiceDetail(CreateUpdateMixin):  # childForm
    tax = models.FloatField()
    concept = models.ForeignKey(ConceptDetail, null=True, blank=True) # fk to override using custom queryset
    invoice = models.ForeignKey('Invoice', null=True, blank=True)

views.py

class CreateInvoiceProcedureView(LoginRequiredMixin, PermissionRequiredMixin, CreateView):
    template_name = 'invoice/invoice_form.html'
    model = Invoice
    permission_required = 'invoice.can_check_invoice'
        def post(self, request, *args, **kwargs):
    self.object = None
    form = InvoiceForm(request=request)
    # initial initial=[{'tax': 16, }] removed
    invoice_detail_form = InvoiceDetailFormSet(request.POST, instance=Invoice,
                                               request=request)
    return self.render_to_response(
        self.get_context_data(
            form=form,
            invoice_detail_form=invoice_detail_form
        )
    )

forms.py

class BaseFormSetInvoice(BaseInlineFormSet):
    def __init__(self, *args, **kwargs):
        # call first to retrieve kwargs values, when the class is instantiated
        self.request = kwargs.pop("request")
        super(BaseFormSetInvoice, self).__init__(*args, **kwargs)
        self.queryset.concept = ConceptDetail.objects.filter(
            Q(area__name=self.request.POST.get('area')) | Q(area__name='default')
        )

class InvoiceForm(forms.ModelForm):
    class Meta:
        model = Invoice
        fields = ('invoice',)

class InvoiceDetailForm(forms.ModelForm):
    class Meta:
        model = InvoiceDetail
        fields = ('concept',)

InvoiceDetailFormSet = inlineformset_factory(Invoice, InvoiceDetail,
                                             formset=BaseFormSetInvoice,
                                             form=InvoiceDetailForm,
                                             extra=1)

我该如何解决？，我需要阅读什么来解决这个问题，我试图调试这个过程，我没有找到答案。我尝试这样做：

def FooForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(FooForm, self).__init__(*args, **kwargs)
        self.fields['concept'].queryset = ConceptDetail.objects.filter(area__name='default')

在一个 inlineformset_factory 中怎么做呢？

【问题讨论】：

标签： django inline-formset

【解决方案1】：

经过大量测试，我的解决方案是在渲染之前覆盖表单集，使用 get_context_data。

def get_context_data(self, **kwargs):
        context = super(CreateInvoiceProcedureView, self).get_context_data(**kwargs)
        for form in context['invoice_detail_form']:
            form.fields['concept'].queryset = ConceptDetail.objects.filter(area__name=self.request.POST.get('area'))
        return context

【讨论】：