优化查询温湿度数据

Controller/SensorGateway/SubDeviceController.py

@@ -400,13 +400,13 @@ class GatewaySubDeviceView(View):
             }
 
             device_type = sub_device_qs[0]['device_type']
-            if device_type == 215 or device_type == 218 or device_type == 219:    # 门磁,烟雾,人体传感器返回拆动状态
+            if device_type == 215 or device_type == 218 or device_type == 219:  # 门磁,烟雾,人体传感器返回拆动状态
                 res['is_tampered'] = sub_device_qs[0]['is_tampered']
             elif device_type == 220:  # 温湿度传感器返回温湿度数据
-                tem_record_qs = SensorRecord.objects.filter(gateway_sub_device_id=sub_device_id, event_type=18).\
-                    order_by('-created_time').values('alarm')
-                hum_record_qs = SensorRecord.objects.filter(gateway_sub_device_id=sub_device_id, event_type=19).\
-                    order_by('-created_time').values('alarm')
+                tem_record_qs = SensorRecord.objects.filter(gateway_sub_device_id=sub_device_id,
+                                                            event_type=18).order_by('-created_time').values('alarm')[:1]
+                hum_record_qs = SensorRecord.objects.filter(gateway_sub_device_id=sub_device_id,
+                                                            event_type=19).order_by('-created_time').values('alarm')[:1]
                 temperature = tem_record_qs[0]['alarm'] if tem_record_qs.exists() else ''
                 humidity = hum_record_qs[0]['alarm'] if tem_record_qs.exists() else ''
                 res['temperature'] = temperature