fix: [stateflow] query cancelled state with parameters failed

stateflow/tests/test_business_object_api.py

@@ -597,6 +597,38 @@ class BusinessObjectAPITestCase(TestCase):
         self.assertLessEqual(time1, time2)
         self.assertLessEqual(time2, time3)
     
+    def test_get_state_logs_api_cancelled_state_with_parameters(self):
+        """测试获取已撤销状态的工艺参数（bug修复验证）"""
+        # 推进并提供参数
+        self.client.post(
+            f'/api/v1/stateflow/business-objects/{self.business_object.id}/advance/',
+            {'parameters': {'temperature': '25.5', 'humidity': '60%'}},
+            format='json'
+        )
+        
+        # 回退（撤销该状态）
+        self.client.post(f'/api/v1/stateflow/business-objects/{self.business_object.id}/step_back/')
+        
+        # 使用 include_cancelled=true 和 include_parameters=true 获取状态记录
+        response = self.client.get(
+            f'/api/v1/stateflow/business-objects/{self.business_object.id}/state-logs/?include_cancelled=true&include_parameters=true'
+        )
+        
+        self.assertEqual(response.status_code, status.HTTP_200_OK)
+        
+        # 验证返回2条记录（撤销后原来的记录也在，只是标记为已撤销）
+        self.assertEqual(response.data['count'], 1)
+        
+        # 验证记录包含工艺参数
+        logs = response.data['state_logs']
+        self.assertEqual(len(logs), 1)
+        
+        state_log = logs[0]
+        self.assertTrue(state_log['is_cancelled'])
+        self.assertIn('parameters_summary', state_log)
+        self.assertEqual(state_log['parameters_summary']['temperature'], '25.5')
+        self.assertEqual(state_log['parameters_summary']['humidity'], '60%')
+    
     def test_advance_when_already_completed(self):
         """测试流程已完成时尝试推进（预期错误）"""
         # 完成所有状态