IntegrityError在 /products/new/Not NULL约束失败：products_product.user_id

Question

我正在创建一个市场，在那里选定的用户可以有他们的商店和CRUD他们的产品。创建Createview类时出现错误。我需要用户添加新产品的表单，根据商店模型返回他自己的商店名称，但看起来像上面有一个错误。以下是我的应用程序:

models.py

class Shop(models.Model):

    shop_name            = models.CharField(max_length=120)
    owner    = models.OneToOneField(User,on_delete=models.CASCADE, related_name="owner")

    def __str__(self):
        return self.shop_name

class Product(models.Model):
    user            = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE,)
    shop            = models.ForeignKey (Shop, on_delete=models.CASCADE, related_name='shop')
    category        = models.ForeignKey(Category, verbose_name ='Categoria',on_delete=False )
    title           = models.CharField(max_length=120)
    slug            = models.SlugField(blank= True, null=True, unique = True)

views.py

class ProductCreateView(LoginRequiredMixin,SubmitBtnMixin, CreateView):
    model = Product
    form_class = ProductForm
    template_name = 'form.html'
    success_url = '/products/list'
    submit_btn = 'Add Product'

    def form_valid(self, form):
        new_product = form.save(commit=False)
        user = self.request.user
        s = Shop.objects.get (owner=user)
        new_product.shop = s
        new_product.save()
        return super (ProductCreateView, self).form_valid(form)

FORM.PY

class ProductForm(ModelForm):

    class Meta:
        model = Product
        fields = ['category', 'title', 'description', 'price', 'image']
        exclude = ['shop']

Answer 1

在您的产品模型中，我没有看到“描述”属性，但是在您的表单中，您指定了“描述”字段。尝试在产品模型的用户字段中添加null=True，blank=True。

class Product(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL,on_delete=models.CASCADE, null=True, blank=True)
    shop = models.ForeignKey (Shop, on_delete=models.CASCADE, related_name='shop')
    category = models.ForeignKey(Category, verbose_name ='Categoria',on_delete=False )
    title = models.CharField(max_length=120)
    slug = models.SlugField(blank= True, null=True, unique = True)