参数类型“Player Function(Player)”不能分配给参数类型“Player Function(User)”

Question

我正在尝试将flutter项目迁移到Firebase的最新版本，当我使用最新的依赖项时，它现在告诉我，来自firebase的用户和来自我自己的Player类的播放器之间存在一些冲突。谢谢!

import 'package:final_firebase_test/models/player.dart';
import 'package:firebase_auth/firebase_auth.dart';



class AuthService {

  final FirebaseAuth _auth = FirebaseAuth.instance;

  Player _userFromFirebaseUser(Player player) {
    return player != null ? Player(uid: player.uid) : null;
  }

  // Auth change user stream
  Stream<Player> get player {
    return _auth.authStateChanges().map(
            (Player player) => _userFromFirebaseUser(player) //This is where it is giving me the error
    );
  }
}

Answer 1

这是因为

_auth.authStateChanges()

返回Stream<User>。要修复它，只需将player属性更改为

Stream<Player> get player {
  return _auth.authStateChanges().map((user) => _userFromFirebaseUser(user));
}

和你的_userFromFirebaseUser到

Player _userFromFirebaseUser(User user) {
  return user != null ? Player(uid: user.uid) : null;
}