fix: process id change when plate_order and printing_order update

api_v1/views/printing/serializers.py

@@ -475,6 +475,12 @@ class PrintingJobCreateUpdateSerializer(serializers.ModelSerializer):
     
     def update(self, instance, validated_data):
         """更新任务，使用 service 层"""
+        # 不允许修改 printing_order 绑定关系（避免业务对象流程不一致）
+        if 'printing_order' in validated_data:
+            new_order = validated_data.get('printing_order')
+            if new_order and new_order.id != getattr(instance, 'printing_order_id', None):
+                raise serializers.ValidationError({'printing_order': '不允许修改印染订单绑定关系'})
+
         user = self.context['request'].user
         success, message, updated_instance = PrintingJobService.update_printing_job(
             instance, validated_data, user
@@ -772,6 +778,27 @@ class PlateOrderCreateUpdateSerializer(serializers.ModelSerializer):
         return super().create(validated_data)
     
     def update(self, instance, validated_data):
+        # 若更新涉及 process 变更，需要重建并重新绑定 BusinessObject（若有未撤销进度则拒绝）
+        new_process_id = validated_data.get('process', None)
+        if new_process_id is not None and new_process_id != getattr(instance, 'process', None):
+            from stateflow.models import Process
+            from stateflow.services import relink_business_object_for_instance
+
+            try:
+                new_process = Process.objects.get(id=new_process_id)
+            except Process.DoesNotExist:
+                # 理论上 validate_process 已校验；这里兜底
+                raise serializers.ValidationError({'process': '流程不存在'})
+
+            relinked = relink_business_object_for_instance(
+                instance=instance,
+                new_process=new_process,
+                default_name=f"PlateOrder-{instance.pk}",
+                default_description=f"开版订单 {instance.pk} 的流程实例",
+            )
+            if relinked is None:
+                raise serializers.ValidationError({'process': '该订单流程已存在有效进度，无法修改流程'})
+
         plate_images = validated_data.pop('plate_image', None)
         if plate_images is not None:
             validated_data['plate_image'] = _build_plate_image_payload(plate_images, self._request_user)