fix: process id change when plate_order and printing_order update

api_v1/views/printing/services.py

@@ -70,10 +70,40 @@ class PrintingOrderService:
         Returns:
             (success, message, updated_order)
         """
-        # 如果要修改 process，需要验证
+        # 如果要修改 process，需要验证并同步 relink 所有 jobs 的 BusinessObject
         if 'process' in data and data['process'] != printing_order.process:
+            new_process = data.get('process')
+            if new_process is None:
+                return False, '流程不能为空，无法修改流程', printing_order
+
+            # 只要存在任意 job 已开始（有未撤销进度）则拒绝
             if not printing_order.can_change_process():
                 return False, '存在已开始的印染任务，无法修改流程', printing_order
+
+            from stateflow.services import relink_business_object_for_instance
+
+            try:
+                with transaction.atomic():
+                    # relink 所有 jobs（jobs 未开始，允许重建并重新绑定 BO）
+                    for job in printing_order.printing_jobs.select_related('business_object').all():
+                        relinked = relink_business_object_for_instance(
+                            instance=job,
+                            new_process=new_process,
+                            default_name=f"PrintingJob-{job.pk}",
+                            default_description=f"印染任务 {job.pk} 的流程实例",
+                        )
+                        if relinked is None:
+                            raise RuntimeError(f'印染任务 {job.pk} 已存在有效进度，无法修改流程')
+
+                    # 最后更新订单流程
+                    printing_order.process = new_process
+                    printing_order.save(update_fields=['process'])
+
+            except RuntimeError as e:
+                return False, str(e), printing_order
+
+            # process 已处理完毕，避免后续通用字段更新再次覆盖
+            data = {k: v for k, v in data.items() if k != 'process'}
         
         # 更新字段
         for field, value in data.items():