optimze home page and product page

backend/home/views.py

@@ -1,11 +1,13 @@
 from django.shortcuts import render, get_object_or_404, redirect
 from rest_framework.views import APIView, Response
-from product.models import ProductModel, SubCategoryModel, MainCategoryModel
+from product.models import ProductModel, SubCategoryModel, MainCategoryModel, ProductVariant
 from product.serializers import SubCategorySerializer, DynamicProductSerializer, MainCategorySerializer
 from .serializers import *
 from .models import *
 from rest_framework import status
 from django.views import View
+from django.db.models import Prefetch
+from django.core.cache import cache
 
 
 class ChangeViewVideo(View):
@@ -18,31 +20,87 @@ class ChangeViewVideo(View):
 
 class HomeView(APIView):
     authentication_classes = []
+    
     def get(self, request):
+        # Check cache first for anonymous users
+        cache_key = 'home_view_data_anonymous'
+        if not request.user.is_authenticated:
+            cached_data = cache.get(cache_key)
+            if cached_data:
+                return Response(cached_data, status=status.HTTP_200_OK)
 
-
-        sliders = SliderModel.objects.all()
+        sliders = SliderModel.objects.only('id', 'link', 'title', 'description', 'image', 'video')[:10]
         slider_ser = SliderSerializer(instance=sliders, many=True, context={'request': request})
 
-        main_categories = MainCategoryModel.objects.filter(show_in_home=True)
+        main_categories = MainCategoryModel.objects.filter(
+            show_in_home=True
+        ).prefetch_related('subcategorys')
         main_category_ser = MainCategorySerializer(instance=main_categories, many=True, context={'request': request})
 
-        top_seller_products = ProductModel.objects.filter(show_in_top_seller=True)
-        top_seller_products_ser = DynamicProductSerializer(instance=top_seller_products, many=True, context={'request': request, 'view_type': 'list'})
+        # Optimize variant prefetching - prefetch all variants, limit applied in serializer
+        variant_prefetch = Prefetch(
+            'variants',
+            ProductVariant.objects.prefetch_related('images').order_by('-discount', 'price')
+        )
 
-        lot_of_discount_products = ProductModel.objects.filter(show_in_lot_of_discount=True)
-        lot_of_discount_products_ser = DynamicProductSerializer(instance=lot_of_discount_products, many=True, context={'request': request, 'view_type': 'list'})
+        # Top seller products
+        top_seller_products = ProductModel.objects.filter(
+            show_in_top_seller=True
+        ).select_related('category', 'shop').prefetch_related(
+            variant_prefetch
+        ).only('id', 'name', 'image', 'rating', 'slug', 'category', 'shop')[:20]
+        top_seller_products_ser = DynamicProductSerializer(
+            instance=top_seller_products, 
+            many=True, 
+            context={'request': request, 'view_type': 'list'}
+        )
 
-        most_viewed_products = ProductModel.objects.filter(show_in_most_viewed=True)
-        most_viewed_products_ser = DynamicProductSerializer(instance=most_viewed_products, many=True, context={'request': request, 'view_type': 'list'})
+        # Lot of discount products
+        lot_of_discount_products = ProductModel.objects.filter(
+            show_in_lot_of_discount=True
+        ).select_related('category', 'shop').prefetch_related(
+            variant_prefetch
+        ).only('id', 'name', 'image', 'rating', 'slug', 'category', 'shop')[:20]
+        lot_of_discount_products_ser = DynamicProductSerializer(
+            instance=lot_of_discount_products,
+            many=True,
+            context={'request': request, 'view_type': 'list'}
+        )
 
-        trends_products = ProductModel.objects.filter(show_in_trends=True)
-        trends_products_ser = DynamicProductSerializer(instance=trends_products, many=True, context={'request': request, 'view_type': 'list'})
+        # Most viewed products
+        most_viewed_products = ProductModel.objects.filter(
+            show_in_most_viewed=True
+        ).select_related('category', 'shop').prefetch_related(
+            variant_prefetch
+        ).only('id', 'name', 'image', 'rating', 'slug', 'category', 'shop')[:20]
+        most_viewed_products_ser = DynamicProductSerializer(
+            instance=most_viewed_products,
+            many=True,
+            context={'request': request, 'view_type': 'list'}
+        )
 
-        home_image = HomeImageModel.objects.all().first()
+        # Trends products
+        trends_products = ProductModel.objects.filter(
+            show_in_trends=True
+        ).select_related('category', 'shop').prefetch_related(
+            variant_prefetch
+        ).only('id', 'name', 'image', 'rating', 'slug', 'category', 'shop')[:20]
+        trends_products_ser = DynamicProductSerializer(
+            instance=trends_products,
+            many=True,
+            context={'request': request, 'view_type': 'list'}
+        )
+
+        home_image = HomeImageModel.objects.only(
+            'id', 'image1', 'image2', 'title1', 'title2', 
+            'description1', 'description2', 'link1', 'link2', 
+            'video1', 'video2'
+        ).first()
         home_image_ser = HomeImageSerializer(instance=home_image, context={'request': request})
 
-        show_cases = ShowCaseSlider.objects.all()
+        show_cases = ShowCaseSlider.objects.only(
+            'id', 'title', 'description', 'image1', 'image2', 'image3', 'background_image'
+        )[:10]
         show_cases_ser = ShowCaseSliderSerialzier(instance=show_cases, many=True, context={'request': request})
 
         response = {
@@ -57,4 +115,8 @@ class HomeView(APIView):
             'show_case_slider': show_cases_ser.data
         }
 
+        # Cache for anonymous users only (avoid issues with user-specific data)
+        if not request.user.is_authenticated:
+            cache.set(cache_key, response, 60 * 5)  # 5 minutes cache
+
         return Response(response, status=status.HTTP_200_OK)