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python - 从 django 中的另一个模型更新模型的字段

问题描述

我的models.py是：

class clients(models.Model):
    client_id = models.IntegerField(unique=True, primary_key=True )
    '
    '
     money = models.DecimalField(max_digits=10, decimal_places=2,default=0)


class transfermoney(models.Model):
    first_client_id = models.IntegerField()
    second_client_id = models.IntegerField()
    amountofmoney = models.PositiveIntegerField()
    time = models.TimeField(auto_now=True)
    date = models.DateField(auto_now=True)

我的 serializers.py 是：

class moneytransfer(serializers.ModelSerializer):
    def validate(self, data):
        try:
            clients.objects.get(client_id = data['first_client_id'])
            clients.objects.get(client_id = data['second_client_id'])
        except clients.DoesNotExist:
            raise serializers.ValidationError("One of the clients does not exist")
        return data

    class Meta:
        model = transfermoney
        fields = ('__all__')
        read_only_fields = ('time','date',)

我的views.py是：

   class transferingmoney(APIView):
        def post(self,request):
            serializer = moneytransfer(data=request.data)
            if serializer.is_valid():
                serializer.save()
                def update(self,data):              
                     client_1 = clients.objects.get(client_id=data['first_client_id'])
                     client_2 = clients.objects.get(client_id=data['second_client_id'])
                     client_1.money -= data['amountofmoney']
                     client_2.money += data['amountofmoney']
                     client_1.save()
                     client_2.save()

                return Response(serializer.data, status=status.HTTP_201_CREATED)
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

我正在使用 django rest 框架，当我向“transferingmoney”发出发布请求时，它在“transfermoney”模型表中做了记录，但它没有更新“clients”中 client_1 或 client_2 的“money”字段“ 模型

请你能帮帮我，我该怎么办？

标签： pythondjangoapidjango-rest-framework

解决方案

问题是您创建了该函数update但从未调用它。您的视图应如下所示：

class transferingmoney(APIView):
        def post(self,request):
            serializer = moneytransfer(data=request.data)
            if serializer.is_valid():
                serializer.save()

                client_1 = clients.objects.get(client_id=serializer.data['first_client_id'])
                client_2 = clients.objects.get(client_id=serializer.data['second_client_id'])
                client_1.money -= serializer.data['amountofmoney']
                client_2.money += serializer.data['amountofmoney']
                client_1.save()
                client_2.save()

                return Response(serializer.data, status=status.HTTP_201_CREATED)
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

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