Question

我正在使用Flutter和Firestore开发社交媒体应用程序。我所做的是，

为用户创建UserAttributes模型类。这是我的模型类代码。

class UserAttributes {
  final String firstName;
  final String secondName;
  final String mobileNumber;
  final String city;
  final String country;
  final int playerPoints;
  final String playerType;
  final String gender;

  UserAttributes(
      {this.firstName,
      this.secondName,
      this.mobileNumber,
      this.city,
      this.country,
      this.playerPoints,
      this.playerType,
      this.gender});
}

2。从Firestore快照获取UserAttributes

List<UserAttributes> _userAttributesFromSnapShot(QuerySnapshot snapshot) {
    return snapshot.documents.map((doc) {
      return UserAttributes(
        firstName: doc.data['First Name'] ?? '',
        secondName: doc.data['Last Name'] ?? '',
        mobileNumber: doc.data['Player Number'] ?? '',
        city: doc.data['Player City'] ?? '',
        country: doc.data['Player Country'],
        playerPoints: doc.data['Player Points'] ?? 0,
        playerType: doc.data['Player Type'] ?? '',
        gender: doc.data['Gender'] ?? '',
      );
    }).toList();
  }

获取UserAttributs流

Stream<List<UserAttributes>> get userdata  {
    return userCollection.snapshots().map(_userAttributesFromSnapShot);
  }

4。在所需页面中设置StreamProvider（用星号标记）

class MapPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    **return StreamProvider<List<UserAttributes>>.value(
      value: DatabaseService().userdata,**
          child: Scaffold( 
backgroundColor: Color(0xff09031D),
appBar: PreferredSize(
  preferredSize: Size.fromHeight(30.0),

  child: header()),
drawer: myDrawer(),
body: Container(child: MyUserData()),
      ),
    );
  }

5。从UserAttributes列表中打印值

class MyUserData extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    final userData = Provider.of<List<UserAttributes>>(context);

    userData.forEach((doc) {
      print(doc.firstName);
      print(doc.secondName);
      print(doc.city);
      print(doc.country);
      print(doc.gender);
      print(doc.playerPoints);
      print(doc.playerType);
    });

    return Container();
  }
}

我的问题是在打印UserAttributes时，我从数据库中获取所有集合。我只想登录用户的UserAttributes。我该如何实现？

Flutter和Cloud Firestore：使用用户模型时，可以从Firestore中的用户获取特定的用户数据

0 个答案: