Django Rest Framework - Помощь по вложенному сериализатору - Невозможно присвоить OrderedDict

Я работаю над созданием вложенного записываемого сериализатора для своего проекта и столкнулся с проблемой. Я следую фрагменту кода здесь DRF Writeable Nested Serializers, но я сталкиваюсь с этой ошибкой, когда пытаюсь отправить полезную нагрузку в конечную точку API через postman:

Cannot assign "OrderedDict([('first_name', 'Mike'), ('last_name', 'Doe'), ('phone_number', '123-456-7890'), ('company_name', 'Trucking Company')])": "Load.primary_driver" must be a "Driver" instance.

В принципе, в данном конкретном сценарии мне нужно иметь возможность создать объект "Load" (или, другими словами, объект отгрузки), а также создать объект "Driver", который связан с "Load" одним POST-запросом. Driver - это FK в модели Load.

Models.py (модель загрузки находится в конце)

views.py (частичный фрагмент кода, но важный кусок

)

class LoadViews(APIView):
    def get(self,request,id=None):
        if id:
            load = Load.objects.get(id=id)
            serializer = LoadSerializer2(load)
            return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)
        else:
            loads = Load.objects.all()
            serializer = LoadSerializer2(loads, many=True)
            return Response({"status": "success", "data": serializer.data}, status=status.HTTP_200_OK)

    def post(self,request):
        serializer = LoadSerializer2(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response({"status":"success", "data":serializer.data}, status=status.HTTP_200_OK)
        else:
            return Response({"status": "Error", "data": serializer.errors}, status=status.HTTP_400_BAD_REQUEST)
    
    def patch(self,request,id=None):
        load = Load.objects.get(id=id)
        serializer = LoadSerializer2(load,data=request.data,partial=True)
        if serializer.is_valid():
            serializer.save()
            return Response({"status": "success", "data": serializer.data})
        else:
            return Response({"status": "error", "data": serializer.errors})

serializers.py

class ContainerSerializer(serializers.ModelSerializer):
    # container_number = serializers.CharField()

    class Meta:
        model = Container
        fields = '__all__'
        depth = 1

class DriverSerializer(serializers.ModelSerializer):

    class Meta:
        model = Driver
        fields = '__all__'
        depth = 1

class BrokerSerializer(serializers.ModelSerializer):

    class Meta:
        model = Broker
        fields = '__all__'
        depth = 1

class EmployeeSerializer(serializers.ModelSerializer):

    class Meta:
        model = Employee
        fields = '__all__'
        depth = 1

class DeliveryLocationSerializer(serializers.ModelSerializer):

    class Meta:
        model = Delivery_Location
        fields = '__all__'
        depth = 1

class PickupLocationSerializer(serializers.ModelSerializer):

    class Meta:
        model = Pickup_Location
        fields = '__all__'
        depth = 1

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = '__all__'
        depth = 1

class LoadSerializer2(serializers.ModelSerializer):

    primary_driver = DriverSerializer(read_only=False)
    bnsf_container_number = ContainerSerializer(read_only=False)
    pickup_location = PickupLocationSerializer(read_only=False)
    delivery_location = DeliveryLocationSerializer(read_only=False)
    broker = BrokerSerializer(read_only=False)
    booked_by = EmployeeSerializer(read_only=False) 

    class Meta:
        model = Load
        fields = '__all__'
        depth = 1

    #custom create method for drivers
    def create(self, validated_data):
        drivers_data = validated_data.pop('primary_driver')
        load = Load.objects.create(**validated_data)
        for driver_data in drivers_data:
            Driver.objects.create(load=load, **driver_data)
        return load 

json я пытаюсь отправить

{
    "primaryDriver": {
        "firstName": "Mike",
        "lastName": "Doe",
        "phoneNumber": "123-456-7890",
        "companyName": "Trucking Company"
        },
    "bnsfContainerNumber": {
        "containerNumber": "CFQU1111"
        },
    "pickupLocation": {
        "streetAddress": "9999 Pickup Street",
        "state": "Wisconsin",
        "zipCode": 55555,
        "city": "Madison"
        },
    "deliveryLocation": {
        "streetAddress": "5568 Delivery Street",
        "state": "California",
        "zipCode": 90210,
        "city": "Los Angeles"
        },
    "broker": {
        "firstName": "Postman",
        "lastName": "Guy",
        "eMail": "plswork@work.com",
        "companyName": "Hot Brokers 4 u",
        "phoneNumber": "123-456-7890"
        },
    "bookedBy": {
        "firstName": "Dane",
        "lastName": "Doe",
        "eMail": "danedoe@email.com",
        "phoneNumber": "123-456-7890"
        },
    "deliveryDate": "2021-10-21",
    "deliveryTime": "12:00:00",
    "pickupDate": "2021-10-09",
    "pickupTime": "12:00:00",
    "loadNumber": "789045",
    "trailerNumber": 776543,
    "sealNumber": 545156,
    "shipmentCost": "900.00",
    "shipmentRevenue": "1500.00"
}

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