POST id objects and retriving nested tables related to it - django

Question

Can someone advise me on how to deal with how to retrieve data such as this example
JSON:
[
{
"deviceid": 4,
"devicename": "###",
"device_measurment": {
"deviceid": 4,
"measurement": "31.8",
}
},
]
How is it right now:
[
{
"deviceid": 4,
"devicename": "###",
},
{
"deviceid": 4,
"measurement": "31.8",
},
]
I understand the problem and why I am getting such a response, but I cannot handle this problem via the serializer. at the moment, I have the following
Views
from itertools import chain
class RetrieveSpecificDevicesView(APIView):
permission_classes = [permissions.IsAuthenticated]
serializer_class = SpecificDeviceSerializer
def post(self, request):
if self.request.method == 'POST':
serializer = SpecificDeviceSerializer(data=request.data)
if serializer.is_valid():
obj1= Devices.objects.using('###').filter(deviceid=serializer.data.get("deviceid"))
obj2= Measurements.objects.using('###').filter(deviceid=serializer.data.get("deviceid"))
dats= chain(obj1, obj2)
data = serializers.serialize('json', dats)
return HttpResponse(data, content_type="application/json")
return JsonResponse(serializer.erorr, status=status.HTTP_201_CREATED)
Serializer
class SpecificDeviceSerializer(serializers.Serializer):
deviceid = serializers.CharField(required=True)
class MeasurmentsSerializer(serializers.ModelSerializer):
class Meta:
model = Measurements
fields = ('measurementid','measurement')
Models
enter image description here
Update:
I am trying to implement via serializer but something is going wrong:
Note: By wrong I mean => *Got AttributeError when attempting to get a value for field devicesname on serializer SpecificDeviceSerializer*.
Views
class RetrieveSpecificDevicesView(APIView):
permission_classes = [permissions.IsAuthenticated]
serializer_class = SpecificcDeviceSerializer
def post(self, request):
if self.request.method == 'POST':
data = self.serializer_class.get_device(self, obj=request.data)
user = SpecificDeviceSerializer(data)
return HttpResponse(user)
Serializers
class SpecificDeviceSerializer(serializers.ModelSerializer):
class Meta:
model = Devices
fields = ( 'deviceid', 'devicename')
class SpecificcDeviceSerializer(serializers.ModelSerializer):
def get_device(self, obj):
device = Devices.objects.using('###').filter(deviceid=obj.get("deviceid"))
return device
class Meta:
model = Devices
fields = ( 'deviceid', 'devicename')

Answer 1

Solution:
Serializer
class SpecificDeviceSerializer(serializers.ModelSerializer):
measurments = serializers.SerializerMethodField()
def get_measurments(self, obj):
device_measurements = obj.measurment_details.last()
serializer = MeasurmentsSerializer(device_measurements)
return serializer.data
class Meta:
model = Devices
fields = ('devicename','measurments')
Views
class RetrieveSpecificDevicesView(viewsets.ModelViewSet):
permission_classes = [permissions.IsAuthenticated]
serializer_class = SpecificDeviceSerializer
def get_queryset(self):
return Devices.objects.using('###').filter(deviceid=self.request.data.get("deviceid"))
JSON:
[
{
"devicename": "RTMU 3068",
"measurments": {
"measurementid": 2980465,
"measurement": "25.6"
}
}
]
Documentation: Best for this case