django - 重用 Django Rest Framework 嵌套序列化器中的现有对象

Question

在 drf 中使用嵌套序列化器时，如何重新使用引用的对象:

假设我有以下两个模型:

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)

使用序列化器:

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

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

    class Meta:
        model = Person

现在，序列化程序可以同时处理Address 和Person 的创建。例如，当我发布以下内容时:

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

创建一个Person，并创建一个Address，其中Person指向新创建的Address。

如果已经存在具有给定的地址，那么不创建新地址而是重用现有地址的最佳方法是什么地址行？即，如果我想让 address_line 字段唯一？ (这种对象重用有时称为“实习”)

如果有两个地址字段 address_line1 和 address_line2 并且我想重用 Address 对象(如果已经存在 >Address 包含这两个字段(即 unique_together=(address_line1, address_line2))？

Answer 1

最近遇到了类似的问题，采用以下方法解决(代码未经测试，仅供引用):

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)

希望这有帮助:)