DRF 上的 POST 问题

Question

Django Rest 框架，PostgreSQL。

型号：

class Manufacturer(models.Model):
    name = models.CharField(max_length=128)

class Product(models.Model):
    name = models.CharField(max_length=64)
    manufacturer = models.ForeignKey(
        Manufacturer, on_delete=models.CASCADE, related_name="products"
    )

序列化器：

class ManufacturerSerializer(serializers.ModelSerializer):
    class Meta:
        model = Manufacturer
        fields = "__all__"

class ProductSerializer(serializers.ModelSerializer):
    manufacturer = ManufacturerSerializer(read_only=True)

    class Meta:
        model = Product
        fields = "__all__"

然后我发送一个 GET 请求，我得到以下响应：

{
    "id": 1,
    "manufacturer": {
        "id": 1,
        "name": "Manufacturer 1"
    },
    "name": "Product 1"
}

然后我发送一个 POST 请求，

{
    "name": "Product 2",
    "manufacturer_id": 1
}

我得到错误：

null value in column "manufacturer_id" of relation "api_product" violates not-null constraint
DETAIL:  Failing row contains (2, Product 2, null).

如何正确撰写post-request？

Answer 1

为您的POST 发送这个：

{
    "name": "Product 2",
    "manufacturer": 1
}

您可能还需要删除整行 manufacturer = ManufacturerSerializer(read_only=True)。