prevent user creating if another create unsuccessful django - django

Question

Probably there is the answer to this question, but I couldn't find it.
How to prevent User - from django.contrib.auth.models import User, creation if userProfileSerializer creating is unsuccessful. I saw a database transaction is an option but it says
While the simplicity of this transaction model is appealing, it also
makes it inefficient when traffic increases. Opening a transaction for
every view has some overhead. The impact on performance depends on the
query patterns of your application and on how well your database
handles locking.
#api_view(['POST'])
#permission_classes([AllowAny])
def register(request):
'''
Registers user to the server. Input should be in the format:
{"username": "username", "password": "1234abcd"}
'''
# Put the data from the request into the serializer
serializer = CreateUserSerializer(data=request.data)
# Validate the data
if serializer.is_valid():
# If it is valid, save the data (creates a user).
serializer.save()
userProfileSerializer = UserProfileSerializer(data=request.data)
userProfileSerializer.context['user_id'] = serializer.data['id']
userProfileSerializer.is_valid(raise_exception=True)
userProfileSerializer.save()
Serializer classes
class CreateUserSerializer(serializers.ModelSerializer):
class Meta:
model = User
fields = ('id', 'username', 'email', 'password', 'first_name', 'last_name',)
extra_kwargs = {
'password': {'write_only': True}
}
def create(self, validated_data):
user = User.objects.create_user(**validated_data)
return user
class UserProfileSerializer(serializers.ModelSerializer):
class Meta:
model = UserProfile
fields = ('title', 'organization', 'user_id')
def create(self, validated_data):
user_id = self.context["user_id"]
user_profile = UserProfile(**validated_data, user_id=user_id)
user_profile.save()
return user_profile

Answer 1

You can do the following:
check that UserProfileSerializer is valid, as you doing already: userProfileSerializer.is_valid(raise_exception=True)
save user serializer as usual after UserProfileSerializer is validated: serializer.save()

Answer 2

Their are some ways,
use transaction.atomic, which you know.
delete the created user after userProfileSerializer unsuccessfull.
Not a way but a trick, Validate both serializers first, confirming everything is all right, then save the user, add user id in profile_serializer, then save the profile_serializer at last. This avoids the transaction.
But it is just a trick; Use transaction as your use case requires it. Its the best way.