如何在django Rest框架中更新多个对象？

Question

我正在尝试使用 ID 更新多个对象，我传入每个需要更新的对象，但找不到任何方法来成功完成此操作。这是我的代码

模型.py

class EventTicket(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid_generate_v1mc, editable=False)
    name = models.CharField(max_length=250)
    description = models.TextField(max_length=1000)

views.py

  class EventTicketView(APIView, PaginationHandlerMixin):
        permission_classes = (AllowAny,)
        def get_object(self, ticket_id):
            try:
                return EventTicket.objects.get(id=ticket_id)
            except EventTicket.DoesNotExist():
                raise status.HTTP_400_BAD_REQUEST
        def patch(self, request, *args, **kwargs):
            for each_ticket in request.data:

                ticket_id = self.get_object(each_ticket['ticket_id'])

                serializer = EventTicketSerializer(instance=ticket_id,data=request.data,partial=True)
                if serializer.is_valid():
                    serializer.save()
                    result = {
                        'message': "updated sucessfully"
                    }
                    return Response(result, status=status.HTTP_201_CREATED)
                else:
                    return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

序列化器.py

class EventTicketSerializer(serializers.ModelSerializer):
    class Meta:
        model = EventTicket
        fields = ['name', 'description']
```

I have to send data like list of multiple objects :::
[
    {
    "ticket_id": "054665ea-4fde-11ea-94b2-9f415c43ba4c",    
    "name": "chris",
    "description":"The golden ticket for day only",

    },
    {   
    "ticket_id": "054656ea-4fde-11ea-94b2-9f415c43ba4c",
    "name": "daut",
    "description":"The premium ticket for day only",

    }
]

Answer 1

以下代码将使您正确理解在单个请求中更新多个对象。 要在单个请求中更新多个对象，最佳实践是使用 PUT 方法而不是 PATCH。 这里，给出的身体数据是：

{
    "ids":[
        "5e41770d2e8fa013d1f034ec",
        "5e41772c2e8fa013d1f034ee",
        "5e4177702e8fa013d1f034f2",
        "5e453f302e8fa075aa18b277",
        "5e4a314f2e8fa070c5251a0a"
    ]
}

我正在将 DemoConfig 模型的给定 ID 的

enabled

属性从

False

更新为

True

。 以同样的方式，您可以更新您的数据。根据您的要求，您可以编写

validate

方法来验证身体数据。 编写序列化器来序列化响应的实例数据。

class DemoAPI(APIView):

    def get_object(self, obj_id):
        try:
            return DemoConfig.objects.get(id=obj_id)
        except (DemoConfig.DoesNotExist, ValidationError):
            raise status.HTTP_400_BAD_REQUEST
    
    def validate_ids(self, id_list):
        for id in id_list:
            try:
                DemoConfig.objects.get(id=id)
            except (DemoConfig.DoesNotExist, ValidationError):
                raise status.HTTP_400_BAD_REQUEST
        return True

    def put(self, request, *args, **kwargs):
        id_list = request.data['ids']
        self.validate_ids(id_list=id_list)
        instances = []
        for id in id_list:
            obj = self.get_object(obj_id=id)
            obj.enabled = True
            obj.save()
            instances.append(obj)
        serializer = DemoSerializer(instances, many=True)
        return Response(serializer.data)

此视图的序列化器是：

class DemoSerializer(DocumentSerializer):
    class Meta:
        model = DemoConfig
        fields = '__all__'

输出：

{
  "data": [
    {
      "id": "5e41770d2e8fa013d1f034ec",
      "name": "CONFIG_1",
      "enabled": true,
      
    },
    {
      "id": "5e41772c2e8fa013d1f034ee",
      "name": "CONFIG_2",
      "enabled": true,
      
    },
    {
      "id": "5e4177702e8fa013d1f034f2",
      "name": "CONFIG_3",
      "enabled": true,
      
    },
    {
      "id": "5e453f302e8fa075aa18b277",
      "name": "CONFIG_4",
      "enabled": true,
      
    },
    {
      "id": "5e4a314f2e8fa070c5251a0a",
      "name": "CONFIG_5",
      "enabled": true,
      
    }
  ]
}

根据您的代码要求，您需要按以下方式使用 PUT 方法。

    def put(self, request, *args, **kwargs):
        data = request.data
        ticket_ids = [i['ticket_id'] for i in data]
        self.validate_ids(ticket_ids)
        instances = []
        for temp_dict in data:
            ticket_id = temp_dict['ticket_id']
            name = temp_dict['name']
            description = temp_dict['description']
            obj = self.get_object(ticket_id)
            obj.name = name
            obj.description = description
            obj.save()
            instances.append(obj)
        serializer = DemoSerializer(instances, many=True)
        return Response(serializer.data)