Question

我制作了用于创建更新大小写的API，但是问题出在task上，如果我在通过邮递员进行更新或创建时仅传递了一个pk like（task = 1），那么它将正常工作，并且将通过引用来创建大小写任务，但任务是一个多领域的领域，我需要将多个任务pk分配给类似task = [1,2]的情况，然后它给出了

之类的错误

        "Incorrect type. Expected pk value, received str."
    ]

class Case(models.Model):
    name = models.CharField(max_length=200)
    task = models.ManyToManyField('task.Task',blank=True, null=True)
    assigned_to = models.ForeignKey("account.User",null=True, blank=True, on_delete=models.SET_NULL)

class CaseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Case
        fields = ('id', 'name', 'task', 'assigned_to')
class CaseCreateView(APIView):
    permission_classes = (IsAuthenticated,)

    @access_permission('case_create')
    def post(self, request, format=None):
        serializer = CaseSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


class CaseUpdateView(APIView):
    permission_classes = (IsAuthenticated,)
    model = Case

    @access_permission('case_edit')
    def put(self, request,pk, format=None):
        case = get_object(self,pk)
        serializer = CaseSerializer(case,data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

Answer 1

我也是DRF的新手，大多数时候我只是使用Generic，但我会尽力帮助您。在您的序列化器中添加read_only_fields=(task, )，然后我们将手动向task实例添加Case。通过这种方式，在create方法中，我们不需要执行“任务”，序列化器将有效。 serializer.py：

class CaseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Case
        fields = ('id', 'name', 'task', 'assigned_to')
        read_only_fields = ('task', )

class CaseUpdateView(APIView):
    permission_classes = (IsAuthenticated,)
    model = Case

    @access_permission('case_edit')
    def put(self, request,pk, format=None):
        case = get_object(self,pk)
        serializer = CaseSerializer(case,data=request.data)
        if serializer.is_valid():
            serializer.save()
            task_id_list = request.data['tasks_id'] # depending on request
            for task_id in task_id_list: # this way we can add to M2M field manually  
                  task = Task.object.get(id=task_id)
                  case.task.add(task)
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

将列表传递给APIVIew中的Manytomany字段，错误为“类型错误。预期的pk值，收到了str。”

1 个答案: