如何在 Django REST Framework API 视图中显示子表

Question

我使用 Django 作为 Backend，使用 PostgresSQl 作为 DB，使用 HTML、CSS 和 Javascript 作为前端。我想在DJANGO REST FRAMEWORK 中显示儿童表，因为我正在使用多表继承。

正如我们在上图中看到的，只显示了产品列表，但没有显示子表。我想显示客户选择的所有数据。我在 DRF 中显示购物车产品

views.py

class AddToCartView(TemplateView):
    template_name = "status.html"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        product_id = self.kwargs['pk']
        product_obj = Product.objects.get(id = product_id)
        cart_id = self.request.session.get("cart_id", None)
        if cart_id:
            cart_obj = Cart.objects.get(id = cart_id)
            this_product_in_cart = cart_obj.cartproduct_set.filter(product = product_obj)
        
            if this_product_in_cart.exists():
                cartproduct = this_product_in_cart.last()
                cartproduct.quantity += 1
                cartproduct.subtotal += product_obj.price
                cartproduct.save()
                cart_obj.total += product_obj.price
                cart_obj.save()
            else:
                cartproduct = CartProduct.objects.create(
                    cart = cart_obj, product = product_obj, rate = product_obj.price, quantity = 1, subtotal = product_obj.price)
                cart_obj.total += product_obj.price
                cart_obj.save() 
        else:
            cart_obj = Cart.objects.create(total=0)
            self.request.session['cart_id'] = cart_obj.id
            cartproduct = CartProduct.objects.create(
                cart = cart_obj, product = product_obj, rate = product_obj.price, quantity = 1, subtotal = product_obj.price)
            cart_obj.total += product_obj.price
            cart_obj.save()

        return context

API 视图 (views.py)

@api_view(['GET'])
def showproduct(request):
    result = CartProduct.objects.all()
    serialize = productserializers(result, many = True)
    return Response(serialize.data)

models.py

class Product(models.Model):
    name = models.CharField(max_length=1330)
    image_src = models.URLField(max_length=1330,null=True, blank=True)
    link_href = models.URLField(max_length=1330,null=True, blank=True)
    brand = models.CharField(max_length = 1330, null=True, blank=True)
    price = models.DecimalField(max_digits=15, decimal_places=2)
    created = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ('-created',)


class Refrigerator(Product):
    series = models.CharField(max_length = 300, null=True, blank=True)
    model = models.CharField(max_length = 300, null=True, blank=True)
    ...

class Cart(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.SET_NULL, null=True, blank=True)
    total = models.PositiveIntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return "Cart: " + str(self.id)


class CartProduct(models.Model):
    cart = models.ForeignKey(Cart, on_delete=models.CASCADE)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    rate = models.PositiveIntegerField()
    quantity = models.PositiveIntegerField()
    subtotal = models.PositiveIntegerField()

    def __str__(self):
        return "Cart: " + str(self.cart.id) + " CartProduct: " + str(self.id)

我想在客户选择的 DRF 中也显示冰箱的详细信息。

serializer.py

class productserializers(serializers.ModelSerializer):
    class Meta:
        model = CartProduct
        fields = "__all__"
        depth = 2

Answer 1

你可以试试这个，在你的Product(models.Model)

 class Meta:
        abstract = True

你可以参考这里的解释：here （我应该对此发表评论，但没有足够的声誉：/）