如何在验证父表单时验证 inlineformset_factory？

问题描述

我正在处理一个 Django 项目，但在验证父表单时找不到验证 inlineformset_factory 的方法。它的 master/detail 表单方法 SaleMSTForm 是来自 SaleMST 模型的父模型表单，而 SaleDTLForm 是来自 SaleDTL 模型的详细表单。当我提交表单时，父表单工作正常并显示它应该在验证时显示的错误，但表单集不显示任何错误，并且在提交错误后被重置。另外，即使发生错误，我也想保存两个表单，不应保存父表单。这是我的代码：

models.py

class SaleMST(models.Model):
    customer = models.ForeignKey(Customer,on_delete=models.RESTRICT)
    date = models.DateField()
    desc = models.CharField(max_length=200,blank=True)
    disc = models.DecimalField(max_digits=20,decimal_places=2,blank=True)
    created_by = models.CharField(max_length=20,null=True,blank=True)
    created_at = models.DateTimeField(auto_Now_add=True)
    modified_by = models.CharField(max_length=20,blank=True)
    modified_at = models.DateTimeField(auto_Now=True)

    def __str__(self):
        return self.desc

class SaleDTL(models.Model):
    mst = models.ForeignKey(SaleMST,on_delete=models.RESTRICT)
    product = models.ForeignKey(Product,on_delete=models.RESTRICT)
    desc = models.CharField(max_length=200,blank=True)
    qty = models.IntegerField()

    def __str__(self):
        return self.desc

forms.py

class SaleMSTForm(forms.ModelForm):
    class Meta:
        model = SaleMST
        fields = ['customer','date','desc','disc']
        widgets = {
            'customer': forms.Select(attrs={
                'class': 'form-control'
            }),'date': forms.DateInput(attrs={
                'class': 'form-control','type': 'date'
            }),'desc': forms.TextInput(attrs={
                'class': 'form-control'
            }),'disc': forms.TextInput(attrs={
                'class': 'form-control'
            }),}
        labels = {
            'customer': 'Customer','desc': 'Description','disc': 'discount'
        }


class SaleForm(forms.ModelForm):
    class Meta:
        model = SaleDTL
        fields = ['mst','product','qty']
        widgets = {
            'product': forms.Select(attrs={
                'class': 'form-control','required': True
            }),'qty': forms.TextInput(attrs={
                'class': 'form-control','required': True
            })
        }
        labels = {
            'product': 'Select Product','desc': 'Description'
        }

views.py

def sale(request):
    m_form = SaleMSTForm()
    # d_form = SaleDTLForm
    d_form = inlineformset_factory(SaleMST,SaleDTL,SaleForm,extra=3)

    if request.method == 'POST':
        print('Printing POST: ',request.POST)
        m_form = SaleMSTForm(request.POST)
        if m_form.is_valid():
            modal_instance = m_form.save(commit=False)
            mst = modal_instance.pk
            print(mst)
            mstf = SaleMST.objects.get(id=mst)
            msg = 'Invoice #' + str(mst) + ' has been created successfuly!'
            formset = d_form(request.POST,instance=mstf)

            if formset.is_valid():
                # formset.save(commit=False)
                formset.save()
                sweetify.success(request,'Success',text=msg,persistent='OK')
                return redirect('sale')

    context = {
        'm_form': m_form,'d_form': d_form,}

    return render(request,'core/sale_form.html',context)

为了避免进一步的复杂化，我使用了默认的 Django 表单 API，以下是我在 sale_form.html 模板文件中实现它的方法：

                            <form class="form" method="POST" action="">
                                {% csrf_token %}

                                {{ m_form }}
                                <hr>
                                {{ d_form }}
                                <hr>
                                <input type="submit" class="btn btn-dark">
                            </form>

解决方法

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