changes

app/signals.py

@@ -3,6 +3,7 @@ from django.dispatch import receiver
 from django.apps import apps
 from channels.layers import get_channel_layer
 from asgiref.sync import async_to_sync
+from django.db import transaction
 
 # Import hàm get_serializer đã có
 from .views import get_serializer
@@ -55,14 +56,25 @@ def generic_post_save_handler(sender, instance, created, **kwargs):
     """
     Hàm xử lý chung cho tín hiệu post_save từ BẤT KỲ model nào.
     """
-    change_type = "created" if created else "updated"
-    send_model_update(instance, change_type)
+    def send_update_after_commit():
+        change_type = "created" if created else "updated"
+        # Re-fetch the instance to ensure we have the committed data
+        refreshed_instance = sender.objects.get(pk=instance.pk)
+        send_model_update(refreshed_instance, change_type)
+
+    transaction.on_commit(send_update_after_commit)
 
 def generic_post_delete_handler(sender, instance, **kwargs):
     """
     Hàm xử lý chung cho tín hiệu post_delete từ BẤT KỲ model nào.
     """
-    send_model_update(instance, "deleted")
+    # For delete, the action happens immediately, so on_commit is not strictly necessary
+    # unless the delete is part of a larger transaction that could be rolled back.
+    # It's safer to use it anyway.
+    def send_delete_after_commit():
+        send_model_update(instance, "deleted")
+
+    transaction.on_commit(send_delete_after_commit)
 
 def connect_signals():
     """