Question

我正在尝试进行迁移，但是我遇到了一个问题。我收到错误消息：

queryset = Data_Point.objects.all()
AttributeError: type object 'Data_Point' has no attribute 'objects'

，我不确定为什么。我已经搜索了错误，但仍然找不到灵魂。错误可以在models.py类中吗？具体来说，问题可能出在与每个表和外键的关联上吗？以下是以下类：

models.py

class System(models.Model):
    System = models.CharField(max_length=255)

    def __str__(self):
        return self.System

class Sub_System(models.Model):
    Sub_System = models.CharField(max_length=255)
    System = models.ForeignKey(System, on_delete=models.CASCADE)

    def __str__(self):
        return self.Sub_System

class Data_Name(models.Model):
    Data_Name = models.CharField(max_length=255)
    Sub_System = models.ForeignKey(Sub_System, on_delete=models.CASCADE)

    def __str__(self):
        return self.Data_Name

class Data_Point(models.Model):
    Captured_Timestamp = models.DateTimeField(auto_now_add=False, blank=True)
    Inserted_Timestamp = models.DateTimeField(default=datetime.now, blank=True)
    Data_Value = models.CharField(max_length=4)
    Data_Name = models.ForeignKey(Data_Name, on_delete=models.CASCADE)

    def __str__(self):
        return self.Data_Value

views.py

class SystemView(viewsets.ModelViewSet):
    queryset = System.objects.all()
    serializer_class = SystemSerializer

class Sub_SystemView(viewsets.ModelViewSet):
    queryset = Sub_System.objects.all()
    serializer_class = Sub_SystemSerializer

class Data_NameView(viewsets.ModelViewSet):
    queryset = Data_Name.objects.all()
    serializer_class = Data_NameSerializer

class Data_PointView(viewsets.ModelViewSet):
    queryset = Data_Point.objects.all()
    serializer_class = Data_PointSerializer

serializers.py

class SystemSerializer(serializers.ModelSerializer):
    class Meta:
        model = System
        fields = ('id', 'System')

class Sub_SystemSerializer(serializers.ModelSerializer):
    class Meta:
        model = Sub_System
        fields = ('id', 'Sub_System', 'System')

class Data_NameSerializer(serializers.ModelSerializer):
    class Meta:
        model = Data_Name
        fields = ('id', 'Data_Name', 'Sub_System')

class Data_Point(serializers.ModelSerializer):
    class Meta:
        model = Data_Point
        fields = ('id', 'Captured_Timestamp', 'Inserted_Timestamp', 'Data_Value', 'Data_name')

Django：AttributeError：类型对象'Data_Point'没有属性'objects'

0 个答案: