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Validate the user if the review for the book already exists or not in DRF

I'm using the Django rest framework to implement a books reviews app where I need to validate the user for 2nd review for that book using ModelViewSet .

What I have tried:

Here is my

class ReviewsSerializer(serializers.ModelSerializer):
        class Meta:
            fields = ('id', 'user', 'text', 'created_at','book','rating')
            model = Reviews

        def validate_user(self, user):

            data = Reviews.objects.filter(user=user)
            request = self.context['request']
            c =

            # if Reviews.objects.filter(book=request.user).exists():
            #     print("ex")
            # else:
            #  print("no")

            #g = Reviews.objects.get(book=request.user)

            #book= get_object_or_404(book, pk=request.c)

            book_id = self.instance
               #book_id = self.context['request'].get('book_id')
            book_id =

            ca = Reviews.objects.filter(company=book_id, user=request.user).exists()

               #g = Reviews.objects.filter(book__user__reviews=request)
               #g = Reviews.objects.filter(book=request.user).exists()
               # return user
                raise serializers.ValidationError(("user already submitted a review for that book"))

            return user
OriginalGriff 11-Dec-21 1:43am    
What does it do that you didn't expect, or not do that you did?
What have you tried to do to find out why?
Are there any error messages, and if so, where and when? What did you do to make them happen?

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