Question

我是新手，请多多包涵，我正尝试在卡片上显示用户创建的信息。我将该信息存储在Firestore中，我想检索它。

我的firebase云存储的组织方式如下： posts / currentUserId / usersPost / INFO

但是我不知道如何在与云交互时在currentUsersId中增加价值。所以说文档旁边是currentUserId，但是我找不到如何增加价值。

import 'package:flutter/material.dart';
import 'package:expandable_card/expandable_card.dart';
import 'dart:async';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'post_details.dart';

class FeedScreen extends StatefulWidget {
  static final String id = 'feed_screen';

  final String userId;
  FeedScreen({this.userId});

  @override
  _FeedScreenState createState() => _FeedScreenState();
}

class _FeedScreenState extends State<FeedScreen> {

  StreamSubscription<QuerySnapshot> subscription;
  List<DocumentSnapshot> snapshot;
  CollectionReference collectionReference =

 Firestore.instance.collection('posts').document(**CurrentUserId**).collection('usersPosts');

  passData(DocumentSnapshot snap) {
    Navigator.of(context).push(new MaterialPageRoute(
        builder: (context) => PostDetails(
              snapshot: snap,
            )));
  }

  @override
  void initState() {
    super.initState();

    subscription = collectionReference.snapshots().listen((datasnapshot) {
      setState(() {
        snapshot = datasnapshot.documents;
      });
    });
  }

Answer 1

要在firebase中获取currentuser ID，您需要firebase_auth，然后可以按如下方式获取currentuserId的值

  final FirebaseUser user = await FirebaseAuth.instance.currentUser();
        final CurrentUserId = user.uid;
//then
Firestore.instance.collection('posts').document(CurrentUserId).collection('usersPosts');

从当前用户的ID中获取价值，以便在带有波动和火灾储备的Feed中显示

1 个答案: