选择多个设备的帖子组名称

Question

我正在尝试为设备组和设备创建 api。一个设备组可以有多个设备，我希望有多个设备的设备组的 post api，因为只有在选择设备时才会显示组创建，并且用户可能会选择多个设备然后创建一个新组。这样在创建组时，那些选定的设备也应该显示为 device_list

这是我的代码，我不确定如何发布请求

class BaseDevice(PolymorphicModel):
  name = models.CharField(max_length=250, blank=False, null=False)
  group = models.ForeignKey('DeviceGroup', related_name="groups", null=True, blank=True)

class Device(BaseDevice):
  description = models.TextField(blank=True, null=True)

class DeviceGroup(models.Model):
    name = models.CharField(max_length=250, blank=False, null=False)  

class DeviceIdSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(source='token', format='hex', read_only=True)
    class Meta:
        model = Device
        # id is the token of the device and name is the name of the device
        fields = ('id', 'name')

class DeviceGroupSerializer(serializers.ModelSerializer):
    name = serializers.StringRelatedField()
    device_list = DeviceIdSerializer(read_only=False, many=True, required=False, source="groups")
    class Meta:
        model = DeviceGroup
        # name is the name of group created and device_list is the list of devices with id(token) and device name
        fields = ('id', 'name', 'device_list')

    def create(self, validated_data):
        print ('validated_data', validated_data)
        device_list_data = validated_data.pop('device_list')
        group = DeviceGroup.objects.create(**validated_data)
        for device_list in device_list_data:
            BaseDevice.objects.create(group=group, **device_list)
        return group

class DeviceGroupAPIView(APIView):
    permission_classes = (permissions.IsAuthenticated,)

    def get_object(self, user, token):
        try:
            return BaseDevice.objects.filter(owner=user).get(token=token)
        except ObjectDoesNotExist:
            return error.RequestedResourceNotFound().as_response()


    def post(self, request, token=None, format=None):
        device_group_instance = DeviceGroup.objects.get(token=token)
        for device_token in request.data['devices']:
            device = Device.objects.get(token=device_token, owner=request.user)
            device.group = device_group_instance

这是我的 api 设计

{
   "data":[
      {
         "id":1,
         "name":"Home",
         "device_list":[
            {
               "id":"481cfef5a4884e52a63d135967fbc367",
               "name":"Oxygen Provider"
            },
            {
               "id":"7eb006d6db50479aa47f887da0d4f10e",
               "name":"Fan Speed"
            }
         ]
      },
      {
         "id":2,
         "name":"Business",
         "device_list":[

         ]
      }
   ]
}

更新

url(r'^device_group/(?P<token>[0-9a-f]+)/add$', DeviceGroupAPIView.as_view(), name='device_group'),

Answer 1

我稍微修改了你的代码

class BaseDevice(PolymorphicModel):
    name = models.CharField(max_length=250, blank=False, null=False)
    group = models.ForeignKey('DeviceGroup', related_name="groups", null=True, blank=True)

class Device(BaseDevice):
    description = models.TextField(blank=True, null=True)

class DeviceGroup(models.Model):
    name = models.CharField(max_length=250, blank=False, null=False)

class DeviceIdSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(source='token', format='hex', read_only=True)
    # token does not exist in your model so this will not be included
    class Meta:
        model = Device
        # id is the token of the device and name is the name of the device
        fields = ('id', 'name')

class DeviceGroupSerializer(serializers.ModelSerializer):
    device_list = DeviceIdSerializer(read_only=False, many=True, required=False, source="groups")
    class Meta:
        model = DeviceGroup
        # name is the name of group created and device_list is the list of devices with id(token) and device name
        fields = ('id', 'name', 'device_list')

    def create(self, validated_data):
        print ('validated_data', validated_data)
        device_list_data = validated_data.pop('groups', [])
        # notice that I pop 'groups' because validation changes the input data 
        # to match the field names
        # Also since it is not required I've added a default value
        group = DeviceGroup.objects.create(**validated_data)
        devices = [BaseDevice(group=group, **device_list) for device_list in device_list_data] 
        BaseDevice.objects.bulk_create(devices)
        # Use bulk create when you have to create multiple objects
        # It hits the db only once instead of multiple times
        return group

class DeviceGroupAPIView(ModelViewSet):
    permission_classes = (permissions.IsAuthenticated,)
    serializer_class = DeviceGroupSerializer
    queryset = DeviceGroup.objects.all()
    # Although I have used ModelViewSet, you could use any other one
    # I used this so that I don't need to write the code for create,
    # update, delete or list


# urls.py
router = routers.DefaultRouter()
router.register(r'device_group', DeviceGroupAPIView, base_name='device_group')
# this gives the following urls
# /device_group/ POST to create, GET to list    
# /device_group/(?<pk>\d+)/  GET to retrieve single DeviceGroup, PATCH/PUT to update it, and DELETE to delete it

这是用于 POST 的 JSON 结构，用于创建带有一堆设备的新 DeviceGroup

{
   "name":"Group Name",
   "device_list":[
      {
         "name":"Device 1"
      },
      {
         "name":"Device 2"
      },
      {
         "name":"Device 3"
      }
   ]
}

希望对你有帮助

另外你应该阅读更多关于Django-Rest-Framework