[Python] DRF Depth Only for Specified Fields for GET & POST

So, I have tried this Stack Overflow - Django REST Framework Depth Only For Specified Fields for specifying which field has depth, it's working, but when I want to do POST for insert new record, it can't because it's like django consider my field as required and set it to NULL. Here is my code...

../apps/models.py

class GroupingTypes(models.Model):
grouping_name = models.CharField(max_length=255, unique=True)
description = models.TextField(null=True, blank=True)

class Meta:
db_table = 'grouping_types'

class Templates(models.Model):
id = models.UUIDField(primary_key=True, default=None, editable=False)
...
name = models.CharField(max_length=255, default=None)
grouping = models.ForeignKey(GroupingTypes, on_delete=models.CASCADE)
file = models.FileField(upload_to="templates/")
...

class Meta:
db_table = 'templates'

def delete(self, *args, **kwargs):
if self.file and os.path.isfile(self.file.path):
os.remove(self.file.path)
super().delete(*args, **kwargs)


../apps/serializers.py

class GroupingTypesSerializer(serializers.ModelSerializer):
class Meta:
model = GroupingTypes
fields = "__all__"


class TemplatesSerializer(serializers.ModelSerializer):
# Extra fields that's not defined in models
unix_timestamp_added = serializers.SerializerMethodField()
datetime_added = serializers.SerializerMethodField()

def get_unix_timestamp_added(self, obj: Templates):
return int(obj.timestamp_added.timestamp())

def get_datetime_added(self, obj: Templates):
return obj.timestamp_added.strftime("%Y-%m-%d %H:%M:%S")

grouping = GroupingTypesSerializer(read_only=True)

class Meta:
model = Templates
fields = "__all__"
extra_kwargs = {
'file': {'write_only': True}
}


../apps/views.py

# `../utils/utils.py`
def post(request: HttpRequest, Serializer: serializers.ModelSerializer):
serializer = Serializer(data=request.data)
if serializer.is_valid():
serializer.save()
print(f"\033[92mPOST\033[0m")
return Response(
{
"success": True,
"msg": "added",
"data": None,
},
status=HTTP_201_CREATED
)
print(f"\033[91mPOST\033[0m")
return Response(
{
"success": False,
"msg": serializer.errors,
"data": None,
},
status=HTTP_400_BAD_REQUEST
)

# -------------------------------------------
# views.py
class TemplatesList(APIView):
def get(self, request: HttpRequest):
...
def post(self. request: HttpRequest):
return utils.utils.post(request, Serializer=TemplatesSerializer)


../apps/urls.py

urlpatterns = [
...
path("template/", TemplatesList.as_view()),
path("template/<str:uuid>/", TemplatesDetail.as_view()),
...
]


I tried to send POST normally in JSON object format but got error says:

django.db.utils.IntegrityError: null value in column "grouping_id" of relation "templates" violates not-null constraint
DETAIL: Failing row contains (828b0759-0642-4844-abfa-1b5b602a27d2, ..., TEMPLATE-NAME, null, templates/new-template_OQggWfx.xlsx, ...).


Body post I sent like this. Just normal:

{
"id": uuid.uuid4(),
...,
"name": "TEMPLATE-NAME",
"grouping": 7,
"file": InMemoryUploadedFile,
...
}


It's all working normal for GET & POST I remove this line

grouping = GroupingTypesSerializer(read_only=True)


But, it will not output as expected for specify filed depth.

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