Product matching query does not exist Django - django

Question

i am trying to insert product in my database using django custom fields, but it's showing me error that Product matching query does not exist.
it would be great if anybody could figure me out where should i make changes in my code. thank you so much in advance.
views.py
class ProductAdd(APIView):
def post(self, request, format=None):
data = request.data
title = data['title']
slug = data['slug']
description = data['description']
# created_on = data['created_on']
# status = data['status']
queryset = Product.objects.filter(title__contains=title,slug__contains=slug,description__contains=description)
query_slug = Product.objects.get(slug__exact=slug).first()
try:
if query_slug == None:
# queryset.annotate(Count(title,slug,description,created_on,status))
queryset.annotate()
Response({"msg":"product added succesfully!"}, status=HTTP_201_CREATED)
else:
print("query already exist!")
except ValueError:
return Response(status=HTTP_400_BAD_REQUEST)

Answer 1

As the error said, it could not find a product based on given slug. To prevent this error from raising, you can use .filter instead of .get:
query_slug = Product.objects.filter(slug__exact=slug).first()
Also, I would recommend using a serializer to serialize and store data in DB. More information can be found in documentation. Here is an example:
# serializer
from rest_framework import serializers
class ProductSerializer(serializers.ModelSerializer):
class Meta:
model = Product
fields = "__all__"
def validate_slug(self, value):
if Product.objects.filter(slug=slug).exists():
raise serializers.ValidationError("Product Exists")
return value
# view
from rest_framework import generics
class ProductAdd(generics.CreateAPIView):
serializer_class = ProductSerializer