Question

在drf中使用嵌套的Serializers时，如何重新使用引用的对象：

假设我有以下两个Model：

class Address(models.Model):
    address_line = models.CharField(max_length=45)

class Person(models.Model):
    name = models.CharField(max_length=45)
    address = models.ForeignKey(Address)

与Serializer s：

class AddressSerializer(serializers.ModelSerializer):
    class Meta:
        model = Address

class PersonSerializer(serializers.ModelSerializer):
    address = AddressSerializer()

    class Meta:
        model = Person

现在，Serializers处理同时创建Address和Person。例如，当我发布以下内容时：

{
    'name': 'Alex',
    'address': {
        'address_line': "1 Here"
    }
}

创建Person并创建Address，Person指向新创建的Address。

如果已经Address已经有Address，那么不创建新Address但重用现有address_line的最佳方式是什么？即如果我想制作address_line字段unique？（此对象重复使用有时称为“实习”）

如果有两个地址字段address_line1和address_line2怎么办？如果已存在Address两个字段，我想重用Address对象（即unique_together=(address_line1, address_line2)）？

Answer 1

最近我遇到了类似的问题，使用以下方法解决了它（代码尚未经过测试，仅供参考）：

class PersonSerializer(serializers.ModelSerializer):
    address = AddressSerializer()

    class Meta:
        model = Person

    def create(self, validated_data):
        # pop the validated user data
        # assuming its a required field,
        # it will always be there in validated_data
        address = validated_data.pop('address')

        try:
            address = Address.objects.get(address_line=address.get('address_line'))
        except ObjectDoesNotExist:
            address_serializer = AddressSerializer(data=address)
            address_serializer.is_valid(raise_exception=True)
            address = address_serializer.save()
        else:
            # save the user and update the validated_data for setting up profile
            validated_data['address'] = address

        return super(PersonSerializer, self).create(validated_data)

希望这会有所帮助：）

在Django Rest Framework嵌套Serializer中重用现有对象

1 个答案: