在 flutter 中获取 Firestore 集合时出现问题

Question

我在 Flutter 中有一个新项目正在处理现有的 Firestore 数据库。我似乎无法在列表视图中显示集合（甚至调试）。 Firestore 访问似乎还可以，因为我可以使用 Auth 模块。如果我使用调试器并进入集合 get 函数，我可以看到正在返回数据，但没有触发 .then 函数。我是飞镖的新手，所以我很难弄清楚为什么数据没有冒泡到 .then()

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class InviteView extends StatelessWidget {
  InviteView({Key? key}) : super(key: key);
  List<String> ids = [];
  @override
  Widget build(BuildContext context) {
    return Expanded(
        child: FutureBuilder(
          future: _getPlayers(),
          builder: (context, snapshot) {
            return ListView.builder(
              itemCount: ids.length,
              itemBuilder: (cxt, idx) {
                return ListTile(
                  title: Text(ids[idx]),
                );
              },
            );
          },
        ),
      );
  }

  Future<void> _getPlayers () async {
    const source = Source.server;

    await FirebaseFirestore.instance.collection('players').get(const GetOptions(source: source)).then(
            (snapshot) => snapshot.docs.map((document) {
              print(document.reference.id);
              ids.add(document.reference.id);
            }),
            onError: (e) => print (e.toString())
    );
  }
}

flutter doctor 的输出

[√] Flutter (Channel stable, 3.0.1, on Microsoft Windows [Version 10.0.22000.675], locale en-AU)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[√] Chrome - develop for the web
[X] Visual Studio - develop for Windows
    X Visual Studio not installed; this is necessary for Windows development.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including all of its default components
[√] Android Studio (version 2021.1)
[√] Android Studio (version 2021.2)
[√] Android Studio (version 4.1)
[√] VS Code (version 1.65.2)
[√] VS Code, 64-bit edition (version 1.32.3)
[√] Connected device (3 available)
[√] HTTP Host Availability

使用 cloud_firestore：^3.1.17

Answer 1

这有帮助吗：

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class InviteView extends StatelessWidget {
  InviteView({Key? key}) : super(key: key);
  List<String> ids = [];
  @override
  Widget build(BuildContext context) {
    return Expanded(
      child: FutureBuilder<Widget>(
        future: _getPlayers(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) return const Text('Oh no!');
          return snapshot.data!;
        },
      ),
    );
  }

  Future<ListView> _getPlayers() async {
    var snap = await FirebaseFirestore.instance.collection('players').get();
    return ListView(
        children: snap.docs
            .map((doc) => ListTile(
                  title: Text(doc.reference.id),
                ))
            .toList());
  }
}

在 flutter 中获取 Firestore 集合时出现问题

Problem getting Firestore collection in flutter

firebase

flutter

google-cloud-firestore