How to access GET data while posting data? - django-rest-framework

Question

I am writing an api for an image labelling game using Django Rest Framework's APIView class.
The game implies that a user will see a picture (resource) and label it with one or more labels (tagging). Since the picture is sent an an object through the GET request and a label references the picture the label was posted for, I somehow need to access the id of the picture when storing a label in the database.
Currently, I am testing my POST request, which is pretty standard:
def post(self, request, *args, **kwargs):
tag_serializer = TagSerializer(data=request.data)
tagging_serializer = TaggingSerializer(data=request.data)
if tagging_serializer.is_valid(raise_exception=True):
tagging_serializer.save(tagging=request.data)
return Response({"status": "success", "data": tagging_serializer.data}, status=status.HTTP_201_CREATED)
else:
return Response({"status": "error", "data": tag_serializer.errors}, status=status.HTTP_400_BAD_REQUEST)
I am handling most of the logic in the TaggingSerializer:
class TaggingSerializer(serializers.ModelSerializer):
tag = TagSerializer(required=False, write_only=False)
resource_id = serializers.PrimaryKeyRelatedField(queryset=Resource.objects.all(),
required=True,
source='resource',
write_only=False)
gameround_id = serializers.PrimaryKeyRelatedField(queryset=Gameround.objects.all(),
required=False,
source='gameround',
write_only=False)
user_id = serializers.PrimaryKeyRelatedField(queryset=CustomUser.objects.all(),
required=False,
source='user',
write_only=False)
class Meta:
model = Tagging
fields = ('id', 'user_id', 'gameround_id', 'resource_id', 'tag', 'created', 'score', 'origin')
depth = 1
def create(self, validated_data):
"""Create and return a new tagging"""
user = None
request = self.context.get("request")
if request and hasattr(request, "user"):
user = request.user
score = 0
tag_data = validated_data.pop('tag', None)
if tag_data:
tag = Tag.objects.get_or_create(**tag_data)[0]
validated_data['tag'] = tag
if not Tag.objects.all().filter(name=tag.name).exists():
score = 0
elif Tag.objects.all().filter(name=tag.name).exists():
score += 5
elif Tag.objects.all().filter(name=tag.name) in coordinated_gameround_tags:
score += 25
tagging = Tagging(
user=user,
gameround=validated_data.get("gameround"),
# resource=request.query_params['resource'].id,
resource=validated_data.get("resource"),
tag=validated_data.get("tag"),
created=datetime.now(),
score=score,
origin=""
)
tagging.save()
return tagging
def to_representation(self, instance):
rep = super().to_representation(instance)
rep['tag'] = TagSerializer(instance.tag).data
return rep
I have tried accessing the resource from the get request with request.query_params but this also does not seem to work. When testing my post request in Postman I keep getting the error "resource_id": ["This field is required"].
Am I using request.query_params the wrong way? Is there another way to access this particular object that I don't know of? How else can I solve this?