Question

我已经尝试使用ModelForm保存外键，但是我收到了这个错误：

The LabRequestForm could not be created because the data didn't validate.

这是我的代码：

model.py

class LabRequestForm(models.Model):
    # lab request form 
    product_name = models.ForeignKey(ProductName, on_delete=models.CASCADE)
    ref_no = models.CharField(max_length=200, unique=True)
    date = models.DateTimeField()
    batch_number = models.CharField(max_length=200, unique=True)
    sampling_time = models.DateTimeField()
    lab_test_number = models.CharField(null=True, max_length=200)

forms.py

class LabRequestModelForm(ModelForm):
    class Meta:
        model = LabRequestForm
        fields = '__all__'

views.py

@login_required
def sampler(request):
    detect_user = Account.objects.get(id=request.user.id)
    if detect_user.is_sampler:
        if request.method == "POST":
            prod_name = ProductName.objects.get(product_name=request.POST.get('product_name'))
            lab_req_form = LabRequestModelForm(request.POST)
            lab_req_form_obj = lab_req_form.save(commit=False)
            lab_req_form_obj.product_name = prod_name
            if lab_req_form_obj.is_valid():
                lab_req_form_obj.save()
                messages.info(request, 'Form Saved')
            else:
                print('not valid')
                messages.error(request, "Form is not valid")
            return HttpResponseRedirect(request.META.get('HTTP_REFERER'))

手动我检查了每个POST数据，它们是正确的。所以我怀疑lab_req_form.save(commit=False)是罪魁祸首。

Answer 1

在验证发生之前，您正在调用save。您的save(commit=False)应位于if lab_req_form.is_valid()下。你也在对象上调用is_valid，而不是在表单上。这应该工作

@login_required
def sampler(request):
    detect_user = Account.objects.get(id=request.user.id)
    if detect_user.is_sampler:
        if request.method == "POST":
            prod_name = ProductName.objects.get(product_name=request.POST.get('product_name'))
            lab_req_form = LabRequestModelForm(request.POST)
            # should validate lab_req_form not lab_req_form_obj
            if lab_req_form.is_valid():
                # moved here
                lab_req_form_obj = lab_req_form.save(commit=False)
                lab_req_form_obj.product_name = prod_name
                lab_req_form_obj.save()
                messages.info(request, 'Form Saved')
            else:
                print('not valid')
                messages.error(request, "Form is not valid")
            return HttpResponseRedirect(request.META.get('HTTP_REFERER'))

使用ModelForm保存外键的正确方法

1 个答案: