comment rate added to serilizer and user detail added too

backend/product/views.py

@@ -590,8 +590,30 @@ class CommentView(APIView):
         ).select_related('user')
         paginator = self.pagination_class()
         paginated_comments = paginator.paginate_queryset(comments, request)
+
+        # OPTIMIZATION: Fetch all user ratings in a single query
+        # Get user IDs from paginated comments to only fetch ratings for displayed comments
+        user_ids = [comment.user_id for comment in paginated_comments]
+
+        # Single query to get all ratings for these users on this product
+        user_ratings = ProductRating.objects.filter(
+            product=product,
+            user_id__in=user_ids
+        ).values_list('user_id', 'rating')
+
+        # Build cache dictionary for O(1) lookups in serializer
+        user_ratings_cache = {user_id: rating for user_id, rating in user_ratings}
+
+        # Pass cache to serializer context to avoid N queries
         comments_ser = self.serializer_class(
-            instance=paginated_comments, many=True)
+            instance=paginated_comments,
+            many=True,
+            context={
+                'request': request,
+                'user_ratings_cache': user_ratings_cache,
+                'product': product
+            }
+        )
         return paginator.get_paginated_response(comments_ser.data)
 
     def post(self, request, slug):