如何以自定义 json 格式返回数据？

Question

模型

class Transaction(models.Model):
    created_at = models.DateTimeField()
    transaction_type = models.ForeignKey(
        TransactionType,
        on_delete=models.CASCADE
    )

class Transfer(models.Model):
    transaction_id = models.ForeignKey(
        Transaction,
        on_delete=models.CASCADE
    )
    debit = models.ForeignKey(
        Account,
        on_delete=models.CASCADE,
        related_name='debit'
    )

序列化器用于获取 json

class TransferSerializer(serializers.ModelSerializer):
    class Meta:
        model = Transfer
        fields = ('created_at', 'debit',)

class TransactionSerializer(serializers.ModelSerializer):
    transfers = TransferSerializer(many=True)
    class Meta:
        model = Transaction
        fields = ('created_at', 'transaction_type', 'transfers')

观看次数

class TransactionViewSet(viewsets.ModelViewSet):
    queryset = Transaction.objects.all()
    serializer_class = TransactionSerializer
    pagination_class = LimitOffsetPagination

如何返回以下json格式的数据？ 最好的方法是什么？ 当我尝试运行它时，出现错误“在序列化程序 TransactionSerializer 上尝试获取字段 transfers 的值时出现错误。”

{
  "created_at": "2019-08-18",
  "transaction_type_id": "1",
  "transfers": {"debit": "100"},
}

Answer 1

• 在您的Transfer 模型中，在事务ForeignKey 中，添加related_name=transfers。

• 在您的TransactionSerializer 中，添加类属性：

transfers = TransferSerializer(many=True)

• 编辑：在您的TransferSerializer 中，将fields 修改为fields=('created_at','transaction_type_id', 'transfers') 这将为您提供：

{
  "created_at": "2019-08-18",
  "transaction_type_id": "1",
  "transfers": [
    {"transfer_type": 1, "debit": "100", ...},
    ...
  ],
}