从 Firebase 读取 UserData 的问题

Question

下图显示了我的数据库的结构。每个模型类都是顶级集合。

在我的 userData 集合中，我在用户首次注册时保存了有关用户的其他信息，例如姓名、地址、电话号码等。我可以成功写入 firebase，但我在从 firebase 读取表单字段时遇到问题。

我在下面粘贴了我的 UserData 类模型和 Notifier 类，这样你就可以看到我做了什么。

请在我的 getUserData() 中遗漏什么？还是我做错了？有人可以告诉我一个更好的方法来实现从 Firebase 读取当前登录的用户数据吗？

class User {
 final String uid;
 final String email;
 final String password;
 User({this.uid, this.email, this.password});
}

class UserData {
  String id;
  String firstName;
  String lastName;
  String phoneNumber;
  String role;
  String businessName;
  String businessType;
  String streetAddress;
  String city;
  String state;
  String postcode;
  String country;
  Timestamp createdAt;
  Timestamp updatedAt;
  UserData(
    this.id,
    this.firstName,
    this.businessType,
    this.businessName,
    this.city,
    this.country,
    this.createdAt,
    this.lastName,
    this.phoneNumber,
    this.postcode,
    this.role,
    this.state,
    this.streetAddress,
    this.updatedAt,
  );
  UserData.fromMap(Map<String, dynamic> data) {
    id = data['id'];
    firstName = data['first_name'];
    lastName = data['last_name'];
    phoneNumber = data['phone_number'];
    role = data['role'];
    businessName = data['business_name'];
    businessType = data['business_type'];
    streetAddress = data['street_address'];
    city = data['city'];
    postcode = data['postcode'];
    state = data['state'];
    country = data['country'];
    createdAt = data['created_at'];
    updatedAt = data['updated_at'];
  }
  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'first_name': firstName,
      'last_name': lastName,
      'phone_number': phoneNumber,
      'role': role,
      'business_name': businessName,
      'business_type': businessType,
      'street_address': streetAddress,
      'city': city,
      'postcode': postcode,
      'state': state,
      'country': country,
      'created_at': createdAt,
      'updated_at': updatedAt,
    };
  }
}

//UserDataNotifier类

class UserDataNotifier with ChangeNotifier {

  UserData _currentLoggedInUserData;

  CollectionReference userDataRef = Firestore.instance.collection('userData');

  UserData get currentLoggedInUserData => _currentLoggedInUserData;

  Future<UserData> getUserData() async {
    String userId = (await FirebaseAuth.instance.currentUser()).uid;
    DocumentSnapshot variable =
        await Firestore.instance.collection('userData').document(userId).get();
    _currentLoggedInUserData = variable.data as UserData;
    notifyListeners();
  }

  Future createOrUpdateUserData(UserData userData, bool isUpdating) async {
    String userId = (await FirebaseAuth.instance.currentUser()).uid;
    if (isUpdating) {
      userData.updatedAt = Timestamp.now();
      await userDataRef.document(userId).updateData(userData.toMap());
      print('updated userdata with id: ${userData.id}');
    } else {
      userData.createdAt = Timestamp.now();
      DocumentReference documentReference = userDataRef.document(userId);
      userData.id = documentReference.documentID;
      await documentReference.setData(userData.toMap(), merge: true);
      print('created userdata successfully with id: ${userData.id}');
    }
    notifyListeners();
  }
}

Answer 1

_currentLoggedInUserData = variable.data() as UserData; 

调用 variable.data 作为 variable.data()

如果不工作，

UserData.fromMap(Map<String, dynamic> data) => UserData(
    id: data['id'];
    firstName: data['first_name'];
    lastName: data['last_name'];
    phoneNumber: data['phone_number'];
    role: data['role'];
    businessName: data['business_name'];
    businessType: data['business_type'];
    streetAddress: data['street_address'];
    city: data['city'];
    postcode: data['postcode'];
    state: data['state'];
    country: data['country'];
    createdAt: data['created_at'];
    updatedAt: data['updated_at'];
  })

_currentLoggedInUserData = UserData.fromMap(variable.data());