Django 非空约束失败：cars\u car.owner\u id

我能够将表单呈现到html上，输入数据并提交它，但是我遇到了NOTNULL约束失败。正如我在我的观点中所指出的，所有者不是被分配给其各自的所有者吗？我不知道这里出了什么问题，请帮忙

---

型号

class Car(models.Model):
    owner = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    name = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    description = models.TextField()
    image = models.ImageField(upload_to=upload_image_path, null=True, blank=True)
    created = models.DateField(auto_now_add=True)
    updated = models.DateField(auto_now_add=False)
    mileage = models.IntegerField()
    open_market_value = models.DecimalField(max_digits=12, decimal_places=2)
    depreciation = models.DecimalField(max_digits=10, decimal_places=2)
    down_payment = models.DecimalField(max_digits=10, decimal_places=2)
    road_tax = models.DecimalField(max_digits=8, decimal_places=2)
    installment = models.DecimalField(max_digits=8, decimal_places=2)
    objects = models.Manager()

    def __str__(self):
        return self.name

class CarCreate(CreateView):
    model = Car
    fields = [
        'name', 'model', 
        'description', 'image', 
        'updated', 'mileage', 
        'open_market_value', 'depreciation', 
        'down_payment', 'road_tax', 
        'installment']
    template_name = 'cars/create_car.html'

    def form_valid(self, form):
        form.instance.created_by = self.request.user
        return super().form_valid(form)

视图

class Car(models.Model):
    owner = models.ForeignKey('auth.User', on_delete=models.CASCADE)
    name = models.CharField(max_length=100)
    model = models.CharField(max_length=100)
    description = models.TextField()
    image = models.ImageField(upload_to=upload_image_path, null=True, blank=True)
    created = models.DateField(auto_now_add=True)
    updated = models.DateField(auto_now_add=False)
    mileage = models.IntegerField()
    open_market_value = models.DecimalField(max_digits=12, decimal_places=2)
    depreciation = models.DecimalField(max_digits=10, decimal_places=2)
    down_payment = models.DecimalField(max_digits=10, decimal_places=2)
    road_tax = models.DecimalField(max_digits=8, decimal_places=2)
    installment = models.DecimalField(max_digits=8, decimal_places=2)
    objects = models.Manager()

    def __str__(self):
        return self.name

class CarCreate(CreateView):
    model = Car
    fields = [
        'name', 'model', 
        'description', 'image', 
        'updated', 'mileage', 
        'open_market_value', 'depreciation', 
        'down_payment', 'road_tax', 
        'installment']
    template_name = 'cars/create_car.html'

    def form_valid(self, form):
        form.instance.created_by = self.request.user
        return super().form_valid(form)

HTML

{%extends'base.html%}
{%load crispy_forms_tags%}
{%block content%}
{%csrf_令牌%}
{{form | crispy}}
{%endblock%}

这很可能是因为

车主

是车型

中的必填字段，但您尚未将其包含在
CreateView的
字段中
 您的模型具有来自“django.auth”的用户模型外键。当您试图保存'Car'模型的对象时，因为模型的'owner'字段中没有提到对象，它显示了错误。所以，你可能想明确地提到它

你可以这样做。假设您有“CarForm”，这是您的“Car”模型的模型形式

user = request.user
car_form = CarForm(request.POST)

if car_form.is_valid():
    car = car_form.save(False)
    car.owner = user
    car.save()