optimze home page and product page

backend/home/admin.py

@@ -11,6 +11,10 @@ from django.utils.html import format_html
 from unfold.decorators import display
 from utils.admin import ModelAdmin
 from unfold.contrib.filters.admin import ChoicesDropdownFilter
+from django.core.cache import cache
+
+# Cache key for home page
+HOME_CACHE_KEY = 'home_view_data_anonymous'
 
 
 @admin.register(ShowCaseSlider)
@@ -27,6 +31,10 @@ class ShowCaseSliderAdmin(ModelAdmin, ImportExportModelAdmin):
             "widget": ArrayWidget,
         }
     }
+    
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
 
 @admin.register(LearnVideoModel)
 class LearnVideoAdmin(UnfoldModelAdmin):
@@ -49,6 +57,10 @@ class LearnVideoAdmin(UnfoldModelAdmin):
     def has_add_permission(self, request, obj=None):
         return request.user.video_uploader
 
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
+
 
     @display(description='دیده شده')
     def display_viewd(self, instance):
@@ -78,6 +90,10 @@ class SliderAdmin(ModelAdmin, ImportExportModelAdmin):
             "widget": ArrayWidget,
         }
     }
+    
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
 
 @admin.register(HomeImageModel)
 class HomeImageAdmin(ModelAdmin, ImportExportModelAdmin):
@@ -93,6 +109,10 @@ class HomeImageAdmin(ModelAdmin, ImportExportModelAdmin):
             "widget": ArrayWidget,
         }
     }
+    
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
 
 
 # admin.py

backend/home/migrations/0019_alter_slidermodel_id.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2 on 2026-05-04 06:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('home', '0018_remove_showcaseslider_image_and_more'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='slidermodel',
+            name='id',
+            field=models.BigAutoField(auto_created=True, db_index=True, primary_key=True, serialize=False, verbose_name='ID'),
+        ),
+    ]

backend/home/models.py

@@ -2,6 +2,7 @@ from django.db import models
 from django.urls import reverse
 
 class SliderModel(models.Model):
+    id = models.BigAutoField(auto_created=True, db_index=True, primary_key=True, serialize=False, verbose_name='ID')
     link = models.URLField(verbose_name='لینک')
     title = models.CharField(max_length=50, verbose_name='عنوان')
     description = models.TextField(verbose_name='توضیحات')

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)

backend/product/admin.py

@@ -15,6 +15,10 @@ from django.shortcuts import redirect, render
 from django.utils.html import format_html
 from .permissions import ProductDetailCategoryPermission, ProductAdminPermission, ProductVariantAdminPermission, ProductVariantInlineAdminPermission, InPackItemsAdminPermission, AttributeTypeAdminPermission, AttributeValueAdminPermission
 from django import forms
+from django.core.cache import cache
+
+# Cache key for home page
+HOME_CACHE_KEY = 'home_view_data_anonymous'
 
 @admin.register(ProductDetailCategory)
 class ProductDetailCategoryAdmin(ProductDetailCategoryPermission, ModelAdmin, ImportExportModelAdmin):
@@ -299,6 +303,10 @@ class ProductVariantInLine(ProductVariantInlineAdminPermission, StackedInline):
             return ['price', 'sell', 'price_in_dollor']
         else:
             return ['price', 'sell', 'price_in_dollor', 'slider_category']
+    
+    def save_formset(self, request, form, formset, change):
+        super().save_formset(request, form, formset, change)
+        cache.delete(HOME_CACHE_KEY)
 
 from unfold.contrib.filters.admin import RelatedDropdownFilter
 
@@ -330,6 +338,10 @@ class ProductVariantAdmin(ProductVariantAdminPermission, ModelAdmin, ImportExpor
     list_display = ('product', 'created_at')
     # inlines = [DetailModelInLine]
 
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
+
 
 @admin.register(ProductModel)
 class ProductModelAdmin(ProductAdminPermission, ModelAdmin, ImportExportModelAdmin):
@@ -369,6 +381,10 @@ class ProductModelAdmin(ProductAdminPermission, ModelAdmin, ImportExportModelAdm
         else:
             return ['show_in_bot', 'bot_banner',  'created_at', 'show_in_top_seller','show_in_trends', 'show_in_most_viewed', 'show_in_lot_of_discount','meta_description', 'meta_keywords', 'meta_rating', 'rating', 'view', 'slug']
 
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
+
     def display_price(self, obj):
         if obj.variants.all().first():
             return obj.variants.all().first().price
@@ -464,6 +480,11 @@ class MainCategoryModelAdmin(ModelAdmin, ImportExportModelAdmin):
         }
     }
 
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
+        cache.delete('all_categories_v2')
+
 @admin.register(SubCategoryModel)
 class SubCategoryModelAdmin(ModelAdmin, ImportExportModelAdmin):
     list_display = ['name', 'parent']
@@ -487,6 +508,20 @@ class SubCategoryModelAdmin(ModelAdmin, ImportExportModelAdmin):
 
     def has_view_permission(self, request, obj = ...):
         return True
+    
+    def has_add_permission(self, request):
+        return True
+    
+    def has_change_permission(self, request, obj=None):
+        return True
+    
+    def has_delete_permission(self, request, obj=None):
+        return False
+
+    def save_model(self, request, obj, form, change):
+        super().save_model(request, obj, form, change)
+        cache.delete(HOME_CACHE_KEY)
+        cache.delete('all_categories_v2')
 
 @admin.register(CommentModel)
 class CommentAdmin(ModelAdmin, ImportExportModelAdmin):

backend/product/serializers.py

@@ -122,12 +122,11 @@ class SubCategorySerializer(serializers.ModelSerializer):
                   'meta_description', 'product_count', 'parent', 'image']
 
     def get_product_count(self, obj):
-        # Use annotated product_count if available (from optimized query)
-        # Otherwise fall back to counting (for backward compatibility)
-        return getattr(obj, 'product_count', obj.products.count())
+        # Use annotated product_count from database annotation
+        return getattr(obj, 'product_count', 0)
 
     def get_parent(self, obj):
-        return obj.parent.name
+        return obj.parent.name if obj.parent else None
 
 
 class UnitCategorySerializer(serializers.ModelSerializer):
@@ -159,6 +158,7 @@ class DynamicProductSerializer(serializers.ModelSerializer):
     main_image = serializers.SerializerMethodField()
     customer_pickup_title = serializers.SerializerMethodField()
     customer_pickup_description = serializers.SerializerMethodField()
+    
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         view_type = self.context.get('view_type', 'all')
@@ -180,31 +180,48 @@ class DynamicProductSerializer(serializers.ModelSerializer):
             'chat': ['id', 'name', 'description', 'variants', 'image']
         }
 
+    def _get_best_deal_variant(self, obj):
+        """Get best deal variant from prefetched variants (pre-ordered by discount/price)"""
+        if not hasattr(self, '_best_deal_cache'):
+            self._best_deal_cache = {}
+        
+        if obj.id not in self._best_deal_cache:
+            # Get first from prefetched variants (already ordered by discount desc, price asc)
+            variants = list(obj.variants.all())
+            self._best_deal_cache[obj.id] = variants[0] if variants else None
+        
+        return self._best_deal_cache[obj.id]
+
     def get_main_image(self, obj):
         if obj.image:
             return obj.image.url
-        return obj.variants.first().images.first().image.url if obj.variants.exists() and obj.variants.first().images.exists() else None
+        # Use prefetched variants
+        variants = list(obj.variants.all())
+        if variants:
+            images = list(variants[0].images.all())
+            if images:
+                return images[0].image.url
+        return None
 
     def get_best_deal_price_before_discount(self, obj):
-        best_deal = obj.get_best_deal_variant()
+        best_deal = self._get_best_deal_variant(obj)
         if best_deal:
             return f'{best_deal.price:,.0f} تومانءءء'
         return 0
     
     def get_best_deal_price_after_discount(self, obj):
-        best_deal = obj.get_best_deal_variant()
+        best_deal = self._get_best_deal_variant(obj)
         if best_deal:
             price_after_discount = best_deal.price_after_discount
             return f'{price_after_discount:,.0f} تومانءءء'
         return 0
     
     def get_best_deal_discount(self, obj):
-        best_deal = obj.get_best_deal_variant()
+        best_deal = self._get_best_deal_variant(obj)
         if best_deal:
             return best_deal.discount
         return 0
 
-
     def get_customer_pickup_title(self, obj):
         if obj.shop:
             return obj.shop.customer_pickup_title
@@ -219,7 +236,7 @@ class DynamicProductSerializer(serializers.ModelSerializer):
         from account.models import UserFavorites
         request = self.context.get('request')
         if not request or not request.user.is_authenticated:
-            return False  # not logged in users haven't added anything
+            return False
 
         # Use exists() with filter instead of fetching all products
         return UserFavorites.objects.filter(user=request.user, products=obj).exists()
@@ -230,23 +247,24 @@ class DynamicProductSerializer(serializers.ModelSerializer):
             varients = obj.variants.filter(slider_category__isnull=False)
         else:
             varients = obj.variants.all()
-        colors = set(varient.color for varient in varients)
         return ProductVariantSerialzier(instance=varients, many=True, context=self.context).data
 
     def get_colors(self, obj):
-        # Use values_list to get only color field, reducing data transfer
-        colors = obj.variants.values_list('color', flat=True).distinct()
-        return list(filter(None, colors))  # Filter out None values
+        # Get colors from prefetched variants efficiently
+        variants = list(obj.variants.all())
+        colors = set()
+        for variant in variants:
+            if variant.color:
+                colors.add(variant.color)
+        return list(colors)
 
     def get_is_new(self, obj):
         return timezone.now() < obj.created_at + timedelta(days=7)
 
     def get_related_products(self, obj):
         if obj.related_products.all().count() >= 5:
-            # Limit to 10 related products
             related_products = obj.related_products.all()[:10]
         else:
-            # Limit category products and exclude current product
             related_products = obj.category.products.exclude(id=obj.id)[:10]
 
         serializer = DynamicProductSerializer(

backend/product/views.py

@@ -92,24 +92,41 @@ class AllCategoriesV2(APIView):
         },
     )
     def get(self, request):
+        from django.core.cache import cache
+        
+        # Check cache first
+        cache_key = 'all_categories_v2'
+        cached_data = cache.get(cache_key)
+        if cached_data:
+            return Response(cached_data, status=status.HTTP_200_OK)
+        
         # Optimize query with prefetch_related to avoid N+1 queries
         unit_categories = UnitCategoryModel.objects.prefetch_related(
             Prefetch(
                 'maincategorys',
-                queryset=MainCategoryModel.objects.prefetch_related(
+                queryset=MainCategoryModel.objects.only(
+                    'id', 'name', 'slug', 'icon', 'meta_title', 'meta_description', 'image', 'video'
+                ).prefetch_related(
                     Prefetch(
                         'subcategorys',
-                        queryset=SubCategoryModel.objects.annotate(
+                        queryset=SubCategoryModel.objects.only(
+                            'id', 'name', 'slug', 'icon', 'meta_title', 'meta_description', 'image', 'parent_id'
+                        ).annotate(
                             product_count=Count('products')
                         )
                     )
                 )
             )
-        ).all()
+        ).only('id', 'name', 'slug', 'icon', 'meta_title', 'meta_description', 'image').all()
 
         categories_ser = self.serializer_class(
             instance=unit_categories, many=True, context={'request': request})
-        return Response(categories_ser.data, status=status.HTTP_200_OK)
+        
+        response_data = categories_ser.data
+        # Cache for 10 minutes
+        cache.set(cache_key, response_data, 60 * 10)
+        
+        return Response(response_data, status=status.HTTP_200_OK)
 
 
 class ProductView(APIView):