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flutter - 未处理的异常 : type 'Future<void>' is not a subtype of type 'Future<Photography>' on Firestore

我需要从firestore数据库中获取所有数据。我是这样走的,https://stackoverflow.com/a/55865045/9139407FuturegetPhotography(){Futuredata=awaitdb.collection('photography').document('0yUc5QBGHNNq6WK9CyyF').setData(jsonDecode(jsonEncode(Photography([AllImages(["list"])],"image_url","Shanika","image_url","lovelycouple","Bhanuk

flutter - 未处理的异常 : type 'Future<void>' is not a subtype of type 'Future<Photography>' on Firestore

我需要从firestore数据库中获取所有数据。我是这样走的,https://stackoverflow.com/a/55865045/9139407FuturegetPhotography(){Futuredata=awaitdb.collection('photography').document('0yUc5QBGHNNq6WK9CyyF').setData(jsonDecode(jsonEncode(Photography([AllImages(["list"])],"image_url","Shanika","image_url","lovelycouple","Bhanuk

flutter - 如何解决 List<dynamic> is not a subtype of type 'Map<String, dynamic>?

错误说它无法创建ApplicableFlightFlightSegmentReference有问题Listdynamicisnotasubtypeoftype'MapString,dynamic这是使用json.decode和fromJson的地方varmap=json.decode(response.body)asMap;ResponseGateresponseGate=newResponseGate.fromJson(map);这是json.decode的输出片段..,ApplicableFlight:{FlightReferences:F1,FlightSegmentRefere

flutter - 如何解决 List<dynamic> is not a subtype of type 'Map<String, dynamic>?

错误说它无法创建ApplicableFlightFlightSegmentReference有问题Listdynamicisnotasubtypeoftype'MapString,dynamic这是使用json.decode和fromJson的地方varmap=json.decode(response.body)asMap;ResponseGateresponseGate=newResponseGate.fromJson(map);这是json.decode的输出片段..,ApplicableFlight:{FlightReferences:F1,FlightSegmentRefere

http - 未处理的异常 : type 'List<String>' is not a subtype of type 'String' in type cast

我正在尝试在我的api中发布一个字符串列表。以下是我的网络代码classDashboardFeeCountApiProviderimplementsDashboardFeeCountSource{@overrideFuturegetDashboardFees(Stringtype,StringuserId,StringyearId,ListfeeCategoryId)async{finalresponse=awaithttp.post(DASHBOARD_FEE_URL,body:{"type":"1","userid":userId,"yearId":yearId,"fee_cat_

http - 未处理的异常 : type 'List<String>' is not a subtype of type 'String' in type cast

我正在尝试在我的api中发布一个字符串列表。以下是我的网络代码classDashboardFeeCountApiProviderimplementsDashboardFeeCountSource{@overrideFuturegetDashboardFees(Stringtype,StringuserId,StringyearId,ListfeeCategoryId)async{finalresponse=awaithttp.post(DASHBOARD_FEE_URL,body:{"type":"1","userid":userId,"yearId":yearId,"fee_cat_

firebase - flutter 问题 : type 'Timestamp' is not a subtype of type 'DateTime'

我正在为我和我的团队正在开发的应用程序寻求帮助。数周以来,我们一直面临以下问题:fluttertype'Timestamp'isnotasubtypeoftype'DateTime'我们想从CloudFirestore获取这些用户数据:出生[日期时间]性别[字符串]许可[日期时间]姓名[字符串]大小[字符串]重量[字符串]只有birth和license在CloudFirestore中存储为1681720252,因此我们将这些数据解析为[DateTime]。这是获取用户数据的代码:import'package:cloud_firestore/cloud_firestore.dart';c

firebase - flutter 问题 : type 'Timestamp' is not a subtype of type 'DateTime'

我正在为我和我的团队正在开发的应用程序寻求帮助。数周以来,我们一直面临以下问题:fluttertype'Timestamp'isnotasubtypeoftype'DateTime'我们想从CloudFirestore获取这些用户数据:出生[日期时间]性别[字符串]许可[日期时间]姓名[字符串]大小[字符串]重量[字符串]只有birth和license在CloudFirestore中存储为1681720252,因此我们将这些数据解析为[DateTime]。这是获取用户数据的代码:import'package:cloud_firestore/cloud_firestore.dart';c

使用flask,关于WARNING: This is a development server. Do not use it in a production deployment问题

当flask开发web服务,本地开发完成后,部署线上环境,运行,也会和本地一样,控制台会打印以下信息:WARNING:Thisisadevelopmentserver.Donotuseitinaproductiondeployment.UseaproductionWSGIserverinstead.提示信息很明显,意思就是在生产环境,不要再用这种方式运行程序,最好用WSGI服务来替代运行。解决办法:就是使用pywsgi来代替app.run(host=“0.0.0.0”,port=5000)fromflaskimportFlaskfromgeventimportpywsgiapp=Flask(_

flask解决WARNING: This is a development server. Do not use it in a production deployment.

解决pycharm flask项目无法正常运行报错如下:WARNING:Thisisadevelopmentserver.Donotuseitinaproductiondeployment.解决方法:更改启动服务器使用WSGI.我的python版本为python3.7所以只能使用gevent包来启用WSGI下载gevent包:在控制台输入:pipinstallgevent 之后在代码中导入个gevent后调用,再runapp就ok了fromgeventimportpywsgiif__name__=='__main__':server=pywsgi.WSGIServer(('0.0.0.0',5