fix: business.object_id maybe null, missing parameters when plate-Order cloned

api_v2/views/stateflow.py

@@ -1,6 +1,8 @@
 from rest_framework import serializers, status, permissions
 from rest_framework.response import Response
 from rest_framework.views import APIView
+from django.core.exceptions import FieldDoesNotExist
+from django.db import transaction
 
 from stateflow import models as stateflow_models
 from stateflow import services as stateflow_services
@@ -49,11 +51,48 @@ class BusinessObjectCloneView(APIView):
             return Response({'detail': 'business_object 不存在'}, status=status.HTTP_404_NOT_FOUND)
 
         try:
-            cloned = stateflow_services.clone_business_object(
-                bo,
-                new_object_id=new_object_id,
-                expected_content_type_id=expected_content_type_id,
-            )
+            with transaction.atomic():
+                cloned = stateflow_services.clone_business_object(
+                    bo,
+                    new_object_id=new_object_id,
+                    expected_content_type_id=expected_content_type_id,
+                )
+
+                # 兼容 printing 的“克隆=新建后复制流程进度”工作流：
+                # 目标业务对象（PlateOrder/PrintingJob）本身持有 business_object 字段，
+                # 需要把克隆后的 BusinessObject 回写到目标对象上，否则前端看不到节点/参数历史。
+                try:
+                    target_obj = cloned.content_type.get_object_for_this_type(pk=cloned.object_id)
+                except Exception:
+                    target_obj = None
+
+                if target_obj is not None:
+                    try:
+                        bo_field = target_obj._meta.get_field('business_object')
+                    except FieldDoesNotExist:
+                        bo_field = None
+
+                    if bo_field is not None and bo_field.related_model is stateflow_models.BusinessObject:
+                        old_bo_id = getattr(target_obj, 'business_object_id', None)
+                        target_obj.business_object = cloned
+                        target_obj.save(update_fields=['business_object'])
+
+                        # 如果目标对象在创建时自动生成了一个“空 business_object”，这里做安全清理，
+                        # 避免同一个业务对象存在多个 BusinessObject 绑定导致后续审计/排查混乱。
+                        if old_bo_id and old_bo_id != cloned.id:
+                            old_bo = (
+                                stateflow_models.BusinessObject.objects
+                                .filter(id=old_bo_id)
+                                .select_related('content_type')
+                                .first()
+                            )
+                            if (
+                                old_bo
+                                and old_bo.state_logs.count() == 0
+                                and old_bo.content_type_id == cloned.content_type_id
+                                and old_bo.object_id == cloned.object_id
+                            ):
+                                old_bo.delete()
         except ValueError as e:
             return Response({'detail': str(e)}, status=status.HTTP_400_BAD_REQUEST)