设置属性值的序列化程序方法在 post 请求中不起作用。我正在使用 Django Rest 框架

Question

我有一个模型，它有一个属性“transaction_id”，这是一个自定义的 ID 字段，必须计算它的值才能保存在数据库中。

我有一个模型：

class Transaction(models.Model):
     field = models.IntegerField(default=0)
     transaction_id = models.UUIDField(unique=True)

这是序列化程序：

class TransactionSerializer(serializers.ModelSerializer):
    class Meta:
        model = Transaction
        fields = '__all__'
        read_only_fields = ['id', 'transaction_id']

    def set_tn_number(self):
        tn_number = "some_string/"
        #I have to perform some calculation in order to get the relevant value
        tn_number = tn_number + str(10)
        return tn_number

现在，在我的 post 视图方法中，我正在执行以下操作：

def post(self, request):
        serializer = TransactionSerializer(data=request.data)
        if serializer.is_valid():
            serializer.tn_number = serializer.set_tn_number()
            serializer.save()
            message = {'message': "Transaction Created Successfully"}
            return Response(message, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

但我仍然收到完整性错误：

NOT NULL constraint failed: transaction_transaction.transaction_id

有人可以帮我解决这个问题吗？

感谢您的宝贵时间

Answer 1

更新验证数据或传递必要的模型属性以将方法保存为 kwargs。

def post(self, request):
    serializer = TransactionSerializer(data=request.data)
    if serializer.is_valid():
        tn_number = serializer.set_tn_number()
        serializer.save(transaction_id=tn_number)
        message = {'message': "Transaction Created Successfully"}
        return Response(message, status=status.HTTP_201_CREATED)
    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

设置属性值的序列化程序方法在 post 请求中不起作用。我正在使用 Django Rest 框架

serializer method to set the value of an attribute doesn't work in a post request. I am using Django Rest Framework

django

django-models

django-rest-framework

django-serializer