refactor: centralize product cache invalidation logic in _invalidate_product_cache function

tienda/views.py

@@ -37,6 +37,13 @@ STOCK_RESERVATION_SESSION_KEY = "stock_reservation_id"
 STOCK_RESERVATION_PAYMENT_SESSION_KEY = "stock_reservation_payment_method"
 
 
+def _invalidate_product_cache(product_ids):
+    unique_product_ids = {product_id for product_id in product_ids if product_id is not None}
+    if not unique_product_ids:
+        return
+    cache.delete_many([f"product_{product_id}" for product_id in unique_product_ids])
+
+
 def _normalize_location_text(value: str) -> str:
     normalized = unicodedata.normalize("NFD", (value or ""))
     without_accents = "".join(char for char in normalized if unicodedata.category(char) != "Mn")
@@ -442,7 +449,7 @@ def _create_stock_reservation_for_cart(request: HttpRequest, cart_items, payment
             for item in cart_items
         ])
 
-    cache.delete_many([f"product_{product_id}" for product_id in product_ids])
+    _invalidate_product_cache(product_ids)
 
     return reservation, []
 
@@ -594,7 +601,8 @@ def create_order_from_cart(request, payment_method, payment_reference="", shippi
             product_row = product_map.get(item.product_id)
             product_row.stock -= item.quantity
             product_row.save(update_fields=["stock"])
-            cache.delete(f"product_{product_row.id}")
+
+        _invalidate_product_cache(product_ids)
 
         cart.items.all().delete()
 
@@ -880,6 +888,7 @@ def crear_producto(request: HttpRequest):
             primary_image=primary_image,
             creator=request.user
         )
+        _invalidate_product_cache([producto.id])
         
         # Agregar imágenes secundarias si se proporcionan
         if secondary_images_files:
@@ -970,7 +979,7 @@ def editar_producto(request: HttpRequest, id: int):
             producto.primary_image = primary_image
 
         producto.save()
-        cache.delete(f"product_{producto.id}")
+        _invalidate_product_cache([producto.id])
 
         if secondary_images_files:
             producto.secondary_images.clear()
@@ -1000,7 +1009,7 @@ def borrar_producto(request: HttpRequest, id: int):
 
     producto = get_object_or_404(Product, id=id, creator=request.user)
     nombre = producto.name
-    cache.delete(f"product_{producto.id}")
+    _invalidate_product_cache([producto.id])
     producto.delete()
     messages.success(request, f"Producto '{nombre}' eliminado correctamente.")
     return redirect("mis_productos")