fix product filters

backend/product/views.py

@@ -20,6 +20,7 @@ from django.db.models import Min, Max, Count, Prefetch
 from home.models import ShowCaseSlider
 from home.serializers import ShowCaseSliderSerialzier
 from order.models import Cart, CartItem
+from django.db.models import Min, Max, Value
 # class APIView(APIView):
 #     def __init__(self, *args, **kwargs):
 #         super().__init__(*args, **kwargs)
@@ -272,61 +273,85 @@ class AllProductsView(APIView):
             if in_stock is not None:
                 if in_stock.lower() == 'true':
                     products = products.filter(
-                        variants__in_stock__gt=0).distinct()
+                        variants__in_stock__gt=0
+                    ).distinct()
                 elif in_stock.lower() != 'false':
-                    return Response({'detail': 'in_stock must be "true" or "false".'}, status=status.HTTP_400_BAD_REQUEST)
+                    return Response(
+                        {'detail': 'in_stock must be "true" or "false".'},
+                        status=status.HTTP_400_BAD_REQUEST
+                    )
 
-            # Filter by discount
+            # Discount filter
             has_discount = request.query_params.get('has_discount')
             if has_discount is not None:
                 if has_discount.lower() == 'true':
                     products = products.filter(
-                        variants__discount__gt=0).distinct()
+                        variants__discount__gt=0
+                    ).distinct()
                 elif has_discount.lower() != 'false':
-                    return Response({'detail': 'has_discount must be "true" or "false".'}, status=status.HTTP_400_BAD_REQUEST)
+                    return Response(
+                        {'detail': 'has_discount must be "true" or "false".'},
+                        status=status.HTTP_400_BAD_REQUEST
+                    )
 
-            # Search filter
+            # Search
             search_query = request.query_params.get('search')
             if search_query:
                 products = products.annotate(
                     similarity=(
-                        TrigramSimilarity('name', search_query)
-                        + TrigramSimilarity(Coalesce('description', Value('')), search_query)
+                        TrigramSimilarity('name', search_query) +
+                        TrigramSimilarity(
+                            Coalesce('description', Value('')),
+                            search_query
+                        )
                     )
                 ).filter(similarity__gt=0.1)
 
+            # Price annotation (IMPORTANT for sorting)
+            products = products.annotate(
+                min_price=Min('variants__price'),
+                max_price=Max('variants__price')
+            )
+
             # Price filters
             price_gte = request.query_params.get('price_gte')
-            price_lte = request.query_params.get('price_lte')
-
-            products = products.annotate(min_price=Min(
-                'variants__price'), max_price=Max('variants__price'))
-
             if price_gte:
                 try:
-                    price_gte = float(price_gte)
-                    products = products.filter(max_price__gte=price_gte)
+                    products = products.filter(
+                        max_price__gte=float(price_gte)
+                    )
                 except ValueError:
-                    return Response({'detail': 'price_gte must be a number.'}, status=status.HTTP_400_BAD_REQUEST)
+                    return Response(
+                        {'detail': 'price_gte must be a number.'},
+                        status=status.HTTP_400_BAD_REQUEST
+                    )
 
+            price_lte = request.query_params.get('price_lte')
             if price_lte:
                 try:
-                    price_lte = float(price_lte)
-                    products = products.filter(min_price__lte=price_lte)
+                    products = products.filter(
+                        min_price__lte=float(price_lte)
+                    )
                 except ValueError:
                     return Response({'detail': 'price_lte must be a number.'}, status=status.HTTP_400_BAD_REQUEST)
 
             # Sorting
             sort_by = request.query_params.get('sort')
+            if sort_by == 'newest':
+                sort_by = '-created_at'
+            elif sort_by == 'oldest':
+                sort_by = 'created_at'
             if sort_by in ['name', '-name', 'created_at', '-created_at']:
                 products = products.order_by(sort_by)
+
+            elif sort_by in ['price', '-price']:
+                products = products.order_by('min_price' if sort_by == 'price' else '-min_price')
             elif search_query:
                 products = products.order_by('-similarity', 'name')
             else:
                 products = products.order_by('name')
 
             # Pagination
-            products.order_by('category')
             paginator = self.pagination_class()
             paginated_products = paginator.paginate_queryset(products, request)
             serializer = self.serializer_class(