check

printing/apps.py

@@ -1,5 +1,8 @@
+import logging
 from django.apps import AppConfig
 
+logger = logging.getLogger(__name__)
+
 
 class PrintingConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
@@ -16,4 +19,9 @@ class PrintingConfig(AppConfig):
         process_completed.connect(
             handlers.on_printing_job_process_completed,
             sender=PrintingJob
+        )
+        
+        logger.info(
+            f'[printing.apps] 已注册 process_completed 信号处理器, '
+            f'sender={PrintingJob}, handler={handlers.on_printing_job_process_completed}'
         )

printing/handlers.py

@@ -33,6 +33,11 @@ def on_printing_job_process_completed(sender, **kwargs):
     """
     from shipment.models import SalesItem, UnitChoices
     
+    logger.info(
+        f'[printing.handlers] 收到 process_completed 信号: '
+        f'sender={sender}, kwargs keys={list(kwargs.keys())}'
+    )
+    
     content_object = kwargs.get('content_object')
     business_object = kwargs.get('business_object')
     last_completed_by = kwargs.get('last_completed_by')
@@ -42,6 +47,7 @@ def on_printing_job_process_completed(sender, **kwargs):
         return
     
     printing_job = content_object
+    logger.info(f'[printing.handlers] 处理 PrintingJob #{printing_job.id}')
     
     # 从 settings 获取配置
     source_state_id = getattr(settings, 'PRINTING_SALES_ITEM_SOURCE_STATE_ID', None)