Fix Docker setup: add gunicorn, fix permissions, update docker-compose and entrypoint, add deployment instructions

myproject/products/views/product_views.py

@@ -161,10 +161,14 @@ class ProductDetailView(LoginRequiredMixin, ManagerOwnerRequiredMixin, DetailVie
     context_object_name = 'product'
 
     def get_queryset(self):
-        # Предзагрузка фотографий и аннотация остатков
+        # Предзагрузка фотографий, категорий, тегов и аннотация остатков
         total_available = Coalesce(Sum('stocks__quantity_available'), Value(0), output_field=DecimalField())
         total_reserved = Coalesce(Sum('stocks__quantity_reserved'), Value(0), output_field=DecimalField())
-        return super().get_queryset().prefetch_related('photos').annotate(
+        return super().get_queryset().prefetch_related(
+            'photos',
+            'categories',
+            'tags'
+        ).annotate(
             total_available=total_available,
             total_reserved=total_reserved,
             total_free=total_available - total_reserved,
@@ -172,9 +176,16 @@ class ProductDetailView(LoginRequiredMixin, ManagerOwnerRequiredMixin, DetailVie
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
-        # Добавляем фотографии товара в контекст
-        context['product_photos'] = self.object.photos.all().order_by('order', 'created_at')
-        context['photos_count'] = self.object.photos.count()
+        # Добавляем фотографии товара в контекст (используем уже загруженные через prefetch_related)
+        product_photos = list(self.object.photos.all())
+        product_photos.sort(key=lambda x: (x.order, x.created_at))
+        context['product_photos'] = product_photos
+        context['photos_count'] = len(product_photos)
+        
+        # Кешируем cost_price_details, чтобы не делать множественные запросы к БД
+        from ..services.cost_calculator import ProductCostCalculator
+        context['cost_price_details'] = ProductCostCalculator.get_cost_details(self.object)
+        
         return context