Question

我对Firebase规则有麻烦。当我将以下读取和写入规则设置为true时，运行以下代码时，它们都可以正常运行。

但是，当我将两个规则都编辑为“ auth！= null”时，出现红色的死亡屏幕！用户已通过身份验证，我可以打印出快照数据。我尝试在Provider.of中打印提取的解码json数据，它显示为“ {错误：权限被拒绝}”

我收到以下错误：

The following NoSuchMethodError was thrown building FutureBuilder<List<void>>(dirty, state: _FutureBuilderState<List<void>>#16171):

'[]'
Dynamic call of null.
Receiver: null
Arguments: [0]

The relevant error-causing widget was
FutureBuilder<List<void>>

When the exception was thrown, this was the stack
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 216:49      throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 721:3   defaultNoSuchMethod
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 715:56  noSuchMethod
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 270:9   _checkAndCall
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 388:10  callMethod

════════════════════════════════════════════════════════════════════════════════

这是代码：

home: StreamBuilder<User>(
          stream: FirebaseAuth.instance.authStateChanges(),
          builder: (context, snapshot) {
           
            if (snapshot.connectionState == ConnectionState.waiting) {
              
              return Scaffold(
                  body: Center(
                      child: CircularProgressIndicator(
                valueColor: AlwaysStoppedAnimation<Color>(Colors.orange),
              )));
            } else if (snapshot.data == null) {
             
              return AuthScreen();
            } else {
             
              return FutureBuilder(
                future: Future.wait([
                  Provider.of<Products>(context, listen: false)
                      .fetchAndSetProducts(),
                  Provider.of<Orders>(context, listen: false)
                      .setAndFetchOrders(FirebaseAuth.instance.currentUser.uid),
                  Provider.of<Products>(context, listen: false)
                      .fetchAndSetBannerMessage(),
                  Provider.of<ProfileProvider>(context, listen: false)
                      .downloadContactAndAddressInfo(
                          FirebaseAuth.instance.currentUser),
                  Provider.of<AdminOrders>(context, listen: false)
                      .setAndFetchExpenses()
                ]),
                builder: (context, snapshot) {
                
                  if (snapshot.connectionState == ConnectionState.waiting) {
                 
                    return Scaffold(
                        body: Center(
                            child: CircularProgressIndicator(
                      valueColor: AlwaysStoppedAnimation<Color>(Colors.orange),
                    )));
                  } else if (snapshot.connectionState == ConnectionState.done &&
                      snapshot.data[0] == true) {
                 
                    return LandingPage();
                  } else {
                    
                    return NoInternetErrorDialog(h1: _h1);
                  }
                },
              );
            }
          },
        ),

Firebase实时数据库-错误消息：{错误：权限被拒绝}

0 个答案: