我正在Django REST中创建此简单的购物API。
内部,我将ID用于外键约束,而guuids
被带到了外界。
对于结帐过程,用户提供了他愿意购买的商品ID列表。 POST数据中的对象因此如下所示:
{
assets: [
{
'product': 'd9d5044d-2284-4d15-aa76-2eee3675035b',
'amount': 4
},
....
]
}
我正在使用以下票证/资产模型:
# Ticket
class Ticket(models.Model):
uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
owner = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='tickets', on_delete=models.CASCADE)
# Assets
class Asset(models.Model):
ticket = models.ForeignKey(Ticket, related_name='assets', on_delete=models.CASCADE)
stock_item = models.ForeignKey(Stock, related_name='stock_item', on_delete=models.SET_NULL, null=True)
amount = models.IntegerField(validators=[MinValueValidator(0)])
序列化程序如下所示:
# Asset serializer
class AssetSerializer(serializers.ModelSerializer):
class Meta:
model = Asset
fields = ('stock_item', 'amount')
# Ticket serializer
class TicketSerializer(WritableNestedModelSerializer):
owner = serializers.ReadOnlyField(source='owner.username')
assets = AssetSerializer(many=True)
class Meta:
model = Ticket
fields = ('uuid', 'owner', 'assets', )
def perform_create(self, serializer):
serializer.save(owner=self.request.user)
发布上面指定类型的对象时,会出现以下错误:
{"assets":[{"stock_item": ["Invalid type. Expected PK, received string"]}]}
我似乎无法解决,我如何指示序列化程序使用uuid
作为查找值?我通过使用lookup_field
成员在视图级别上解决了类似的问题,但这似乎无法解决。有什么建议吗?
在此处输入代码
答案 0 :(得分:1)
如果我对您的理解正确,那么SlugRelatedField应该能够找到正确的相关对象。
class AssetSerializer(serializers.ModelSerializer):
ticket = serializers.SlugRelatedField(
read_only=True,
slug_field='uuid',
queryset=Ticket.objects.all() # Might be redundant with read_only=True
)
class Meta:
model = Asset
fields = ('ticket', 'stock_item', 'amount')