错误：'User‘名称在'package:firebase_auth/firebase_auth.dart’和'package:quizmaker/models/user.dart‘中定义

Question

Dart分析显示以下错误：

错误:未定义的类'FirebaseUser‘。( quizmaker lib\services\auth.dart:7的undefined_class)

错误:名称'User‘在库'package:firebase_auth/firebase_auth.dart’和'package:quizmaker/models/user.dart‘中定义。( quizmaker lib\services\auth.dart:7的ambiguous_import)

错误:名称'User‘在库'package:firebase_auth/firebase_auth.dart’和'package:quizmaker/models/user.dart‘中定义。( quizmaker lib\services\auth.dart:8的ambiguous_import)

错误：'User‘不是一个函数。( quizmaker lib\services\auth.dart:8的invocation_of_non_function)

错误:名称'User‘在库'package:firebase_auth/firebase_auth.dart’和'package:quizmaker/models/user.dart‘中定义。( quizmaker lib\services\auth.dart:15的ambiguous_import)

代码如下：

import 'package:firebase_auth/firebase_auth.dart';
import 'package:quizmaker/models/user.dart';

class AuthService {
  FirebaseAuth _auth = FirebaseAuth.instance;

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

  Future signInEmailAndPassword(String email, password) async {
    try {
      UserCredential authResult = await _auth.signInWithEmailAndPassword(
          email: email, password: password);
      User? firebaseUser = authResult.user;
      return _userFromFirebaseUser(firebaseUser);
    } catch (e) {
      print(e.toString());
    }
  }
}

Answer 1

import 'package:quizmaker/models/user.dart' as u;
.
.
  u.User _userFromFirebaseUser(FirebaseUser user){
    return user != null ? u.User(uid: user.uid) : null;
  }

这个错误是因为在FirebaseAuth库中有一个User对象，在您的定制模型中也有一个。您必须从您的导入中指定哪个是哪个。将自定义模型中的一个作为u导入，就像在上面的代码中一样，当您在函数中使用它时，将它称为u.user。