将参数传递给序列化程序 DRF

Question

好吧，我正在努力向序列化程序类发送参数，我的代码如下所示：

模型.py

class Transaction(models.Model):
    owner = models.ForeignKey(User, on_delete=models.SET("DELETED"), related_name='transactions')
    date = models.DateField(auto_now_add=True)
    concept = models.CharField(max_length=100)
    value = models.DecimalField(max_digits=10, decimal_places=2)
    total = models.DecimalField(max_digits=10, decimal_places=2)

序列化程序.py

class TransactionSerializer(serializers.ModelSerializer):
    total = serializers.ReadOnlyField(source='new_total')
    owner = serializers.ReadOnlyField(source='owner.username')

    class Meta:
        model = Transaction
        fields = '__all__'

视图.py

class TransactionHandler(viewsets.ModelViewSet):
    queryset = Transaction.objects.all()
    serializer_class = TransactionSerializer

    def perform_create(self, serializer):
        last_transaction = Transaction.objects.latest('id')
        new_total = last_transaction.total + Decimal(self.request.data['value'])
        serializer.save(owner=self.request.user, new_total=new_total)

当在 serializer.save() 方法中时，只有所有者参数一切正常，但是当我添加第二个参数时，一切都会变得混乱

Answer 1

您的序列化程序具有命名字段，total因此您需要total作为参数名称传递：

serializer.save(owner=self.request.user, total=new_total)