[英]I'm getting an [] isn't defined for Object error in dart when following a Flutter Firebase tutorial?
[英]Error on Tutorial of Firebase for Flutter
在遵循 Firebase for Flutter 的教程后,我收到了錯誤: https ://codelabs.developers.google.com/codelabs/flutter-firebase/#4 。
我使用的是 Andriod Studio 4.0.1。
dev_dependencies:
flutter_test:
sdk: flutter
cloud_firestore: ^0.14.0+2
錯誤:
lib/main.dart:84:31: Error: The argument type 'Map<String, dynamic> Function()' can't be assigned to the parameter type 'Map<String, dynamic>'.
- 'Map' is from 'dart:core'.
: this.fromMap(snapshot.data, reference: snapshot.reference);
^
來自@Peter Haddad 的解決方案:
this.fromMap(snapshot.data(), reference: snapshot.reference);
另一個錯誤:
The following FirebaseException was thrown building MyHomePage(dirty, state: _MyHomePageState#257aa):
[core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()
The relevant error-causing widget was:
MyHomePage file:///D:/Private/Project/workspace_flutter/baby_names/lib/main.dart:12:13
When the exception was thrown, this was the stack:
#0 MethodChannelFirebase.app (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:118:5)
#1 Firebase.app (package:firebase_core/src/firebase.dart:52:41)
#2 FirebaseFirestore.instance (package:cloud_firestore/src/firestore.dart:43:21)
#3 Firestore.instance (package:cloud_firestore/src/firestore.dart:246:30)
#4 _MyHomePageState._buildBody (package:baby_names/main.dart:35:25)
您正在使用新版本的 Cloud Firestore。 因此,您現在必須執行以下操作:
this.fromMap(snapshot.data(), reference: snapshot.reference);
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