fix: process id change when plate_order and printing_order update

api_v1/views/printing/test_api.py

@@ -514,6 +514,54 @@ class PrintingOrderAPITestCase(TestCase):
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         order.refresh_from_db()
         self.assertEqual(order.process.id, new_process.id)
+
+    def test_update_process_with_jobs_not_started_relinks_jobs(self):
+        """测试：有任务但均未开始时允许改流程，并对所有 jobs 重建/绑定新的 business_object"""
+        order = printing_models.PrintingOrder.objects.create(
+            merchant=self.merchant,
+            customer=self.customer,
+            fabric='测试布料',
+            width='150cm',
+            process=self.process,
+        )
+
+        category = basic_models.ProductCategory.objects.create(
+            name='测试类别2',
+            merchant=self.merchant,
+        )
+        product = basic_models.Product.objects.create(
+            name='测试产品2',
+            category=category,
+            merchant=self.merchant,
+        )
+
+        job = printing_models.PrintingJob.objects.create(
+            printing_order=order,
+            product=product,
+            quantity=10,
+            unit='件',
+        )
+        # 绑定一个旧的 business_object（未推进过，未开始）
+        old_bo = stateflow_models.BusinessObject.objects.create(
+            name=f'PrintingJob-{job.id}',
+            process=self.process,
+        )
+        job.business_object = old_bo
+        job.save()
+
+        new_process = stateflow_models.Process.objects.create(name='新流程2')
+        data = {'process': new_process.id}
+
+        response = self.client.patch(f'/api/v1/printing-orders/{order.id}/', data, format='json')
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+
+        order.refresh_from_db()
+        self.assertEqual(order.process.id, new_process.id)
+
+        job.refresh_from_db()
+        self.assertIsNotNone(job.business_object)
+        self.assertNotEqual(job.business_object.id, old_bo.id)
+        self.assertEqual(job.business_object.process.id, new_process.id)
     
     def test_cannot_update_process_when_job_started(self):
         """测试有已开始的任务时不能修改流程"""