I have a OneToMany relation. One Construction and many Cameras. I want to return all Building object fields in CameraSerializer
Problem
When I perform POST request (create new Camera object)
{
"name": "CameraName",
"url": "CameraUrl",
"building": 2
}
I have an error
{
"building": {
"nonFieldErrors": [
"Invalid data. Expected a dictionary, but got int."
]
}
}
Reason of error -- Django expects FULL Construction object, but I want to set only ID
How can I fix the error?
models.py
class Construction(models.Model):
""" Объект строительства"""
developer = models.ForeignKey(
Developer, related_name="constructions", on_delete=models.CASCADE
)
name = models.CharField(max_length=100)
plan_image = models.ImageField(upload_to=name_image, blank=True, null=True)
...
def __str__(self):
return self.name
class Camera(models.Model):
building = models.ForeignKey(
Construction, related_name="cameras", on_delete=models.CASCADE
)
name = models.CharField(max_length=100)
url = models.CharField(max_length=100)
...
def __str__(self):
return self.name
serializers.py
class ConstructionSerializer(serializers.ModelSerializer):
coordinates = MyPointField()
deadline = serializers.DateTimeField(format=TIME_FORMAT)
cameras_number = serializers.SerializerMethodField()
developer_name = serializers.SerializerMethodField()
events = serializers.SerializerMethodField()
class Meta:
model = Construction
fields = (
'id', 'developer', 'developer_name', 'name', 'plan_image', 'address', 'coordinates', 'deadline',
'workers_number', 'machines_number', 'cameras_number', 'events'
)
read_only_fields = ('workers_number', 'machines_number', 'cameras_number', 'events')
def create(self, validated_data):
instance = super().create(validated_data=validated_data)
return instance
class CameraSerializer(serializers.ModelSerializer):
frames = FrameSerializer(many=True, read_only=True)
building = ConstructionSerializer()
class Meta:
model = Camera
fields = (
'id', 'building', 'name', 'url', 'zone_id_x', 'zone_id_y',
'proc_id', 'path_frames', 'frames'
)
read_only_fields = ('proc_id', 'path_frames', 'frames')
def create(self, validated_data):
instance = super().create(validated_data=validated_data)
instance.set_proc_id()
instance.set_path_frame()
return instance
views.py
class CameraView(viewsets.ModelViewSet):
serializer_class = CameraSerializer
queryset = Camera.objects.all()
def get_camera_create_serializer(self, *args, **kwargs):
kwargs["context"] = self.get_serializer_context()
return self.serializer_class(*args, **kwargs)
def create(self, request, *args, **kwargs):
serializer = self.get_camera_create_serializer(data=request.data)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
response = {"result": serializer.data}
return Response(
response, status=status.HTTP_201_CREATED, headers=headers
)
