Firebase 颤振，FieldValue.removeArray（）不工作

我正试图从firestore db中的列表中删除元素，但它不起作用。我发现奇怪的是FieldValue.arrayUnion（）和FieldValue.delete（）工作正常。为什么FieldValue.arrayRemove（）是唯一不起作用的？谢谢

数据库服务

import'包：cloud_firestore/cloud_firestore.dart'；
导入“包：firebase_auth/firebase_auth.dart”；
导入“package:innovative_world/models/list_model.dart”；
类数据库服务{
//收藏参考
CollectionReference listCollection=Firestore.instance.collection（“列表”）；
//获取当前用户id
最后一个字符串uid；
数据库服务（{this.uid}）；
//将数据设置为firestore db
未来setUserData（列表）异步{
return wait listCollection.document（uid）.setData（{
“列表”：列表
});
}
//不希望删除元素
未来的deleteListArr（int索引）异步{
返回等待列表集合。文档（uid）
.updateData（{“列表”：FieldValue.arrayRemove（[index]）}）；
}
//用户列表快照
UserList\u userListFromSnapshot（文档快照快照）{
返回用户列表(
uid:uid，
列表：snapshot.data[“list”].cast（）.toList（）
); 
} 
//用于用户待办事项列表的流
流获取用户列表流{
返回listCollection.document（uid）.snapshots（）
.map（_userListFromSnapshot）；
}
}

家 导入“包装：颤振/材料.省道”； 导入“package:flatter/rendering.dart”； 导入“包：innovative_world/services/auth_service.dart”； 导入“package:innovative_world/models/list_model.dart”； 导入“package:innovative_world/services/database_service.dart”； 导入“包装：创新世界/共享/装饰.dart”； 导入“package:innovative_world/shared/loading.dart”； 导入“包：provider/provider.dart”； 导入“包：innovative_world/models/user_model.dart”； 导入“package:innovative_world/models/list_model.dart”； 类Home扩展了StatefulWidget{ @凌驾 _HomeState createState（）=>\u HomeState（）； } 类(HomeState扩展状态){ 字符串-文本； final _formKey=GlobalKey（）； 列表userDoc=[]； @凌驾 小部件构建（构建上下文）{ 最终用户=提供者（上下文）； 返回流生成器( 流：DatabaseService（uid:user.uid）.userListStream， 生成器：（上下文，快照）{ if（snapshot.hasData）{ UserList UserList=snapshot.data； //List userDoc=[userList.List.toString（）]； 返回脚手架( 背景颜色：颜色。蓝色[200]， appBar:appBar( 标题：正文( “创建列表”， 样式：TextStyle( 字体大小：23.0， ), ), 标高：0.0， 行动：[ FlatButton.icon( 已按下：（）{ AuthService（）.signOut（）； }, 图标：图标（Icons.person）， 标签：文本（“注销”）， ), ], ), 主体：填充物( 填充：LTRB（20.0,25.0,20.0,0.0）中的常数边集， 子：列( 儿童：[ 形式( 键：_formKey， 子：列( 儿童：[ TextFormField( 验证器：（val）=> val.isEmpty？“输入文本”：null， 一旦更改：（val）=>setState（（）=>_text=val）， 装饰：InputDecorationConst.copyWith( hintText:“创建列表…”）， ), 升起的按钮( onPressed:（）异步{ if（_formKey.currentState.validate（））{ userDoc.add（_text）； _formKey.currentState.reset（）； 等待数据库服务（uid:user.uid） .setUserData（userDoc？？userList.list）； } }, 颜色：颜色。粉红色， 子：文本( “添加到列表”， 样式：TextStyle( 字体大小：15.0，颜色：彩色。白色）， ), ), ], ), ), 尺寸箱（高度：15.0）， ListView.builder( 收缩膜：对， itemCount:userList.list.length， itemBuilder：（上下文，索引）{ returnforlist（索引：index，列表：userList.list）； }, ), ], ), ), ); }否则{ 返回加载（）； } }); } } 类ForList扩展了StatefulWidget{ 最终整数指数； 最终名单； ForList（{this.index，this.theList}）； @凌驾 _ForListState createState（）=>\u ForListState（）； } 类\u ForListState扩展了状态{ bool-isSelected=false；

 import 'package:cloud_firestore/cloud_firestore.dart';
    import 'package:firebase_auth/firebase_auth.dart';
    import "package:innovative_world/models/list_model.dart";

    class DatabaseService {
      // Collection Reference
      CollectionReference listCollection = Firestore.instance.collection("list");

      // Get current users id
      final String uid;
      DatabaseService({this.uid});

      // Set data to firestore db
      Future setUserData(List<String> list) async {
        return await listCollection.document(uid).setData({ 
          "list": list
        });
      }

      // DOES NOT WANT TO REMOVE ELEMENTS
      Future deleteListArr(int index) async {
        return await listCollection.document(uid)
          .updateData({ "list": FieldValue.arrayRemove([index]) });
      }

      // UserList snapshot
      UserList _userListFromSnapshot(DocumentSnapshot snapshot) {
        return UserList(
          uid: uid, 
          list: snapshot.data["list"].cast<String>().toList()
          ); 
      } 
      // Stream for user's to do list
      Stream<UserList> get userListStream {
        return listCollection.document(uid).snapshots()
          .map(_userListFromSnapshot);
      }
    }

  import "package:flutter/material.dart";
    import 'package:flutter/rendering.dart';
    import "package:innovative_world/services/auth_service.dart";
    import "package:innovative_world/models/list_model.dart";
    import 'package:innovative_world/services/database_service.dart';
    import "package:innovative_world/shared/decoration.dart";
    import 'package:innovative_world/shared/loading.dart';
    import 'package:provider/provider.dart';
    import "package:innovative_world/models/user_model.dart";
    import "package:innovative_world/models/list_model.dart";


    class Home extends StatefulWidget {
      @override
      _HomeState createState() => _HomeState();
    }

    class _HomeState extends State<Home> {
      String _text;
      final _formKey = GlobalKey<FormState>();
      List<String> userDoc = [];


      @override
      Widget build(BuildContext context) {
        final user = Provider.of<UserId>(context);

        return StreamBuilder<UserList>(
            stream: DatabaseService(uid: user.uid).userListStream,
            builder: (context, snapshot) {
              if (snapshot.hasData) {
                UserList userList = snapshot.data;
                // List<String> userDoc = [userList.list.toString()];
                return Scaffold(
                  backgroundColor: Colors.blue[200],
                  appBar: AppBar(
                    title: Text(
                      "Create List",
                      style: TextStyle(
                        fontSize: 23.0,
                      ),
                    ),
                    elevation: 0.0,
                    actions: <Widget>[
                      FlatButton.icon(
                        onPressed: () {
                          AuthService().signOut();
                        },
                        icon: Icon(Icons.person),
                        label: Text("Sign out"),
                      ),
                    ],
                  ),
                  body: Padding(
                    padding: const EdgeInsets.fromLTRB(20.0, 25.0, 20.0, 0.0),
                    child: Column(
                      children: <Widget>[
                        Form(
                          key: _formKey,
                          child: Column(
                            children: <Widget>[
                              TextFormField(
                                validator: (val) =>
                                    val.isEmpty ? "Enter text" : null,
                                onChanged: (val) => setState(() => _text = val),
                                decoration: InputDecorationConst.copyWith(
                                    hintText: "Create List..."),
                              ),
                              RaisedButton(
                                onPressed: () async {
                                  if (_formKey.currentState.validate()) {
                                    userDoc.add(_text);

                                    _formKey.currentState.reset();
                                    await DatabaseService(uid: user.uid)
                                        .setUserData(userDoc ?? userList.list);
                                  }
                                },
                                color: Colors.pink,
                                child: Text(
                                  "Add to list",
                                  style: TextStyle(
                                      fontSize: 15.0, color: Colors.white),
                                ),
                              ),
                            ],
                          ),
                        ),
                        SizedBox(height: 15.0),
                        ListView.builder(
                          shrinkWrap: true,
                          itemCount: userList.list.length,
                          itemBuilder: (context, index) {
                            return ForList(index: index, theList: userList.list);
                          },
                        ),
                      ],
                    ),
                  ),
                );
              } else {
                return Loading();
              }
            });
      }
    }

    class ForList extends StatefulWidget {
      final int index;
      final List<String> theList;

      ForList({this.index, this.theList});

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

    class _ForListState extends State<ForList> {
      bool isSelected = false;

      @override
      Widget build(BuildContext context) {
        final user = Provider.of<UserId>(context);

        return Column(
          children: <Widget>[
            Card(
              child: CheckboxListTile(
                title: Text(widget.theList[widget.index]),
                value: isSelected,
                onChanged: (bool val)  {
                  setState(() {
                    isSelected = val;
                    if (isSelected) {
                    DatabaseService(uid: user.uid).deleteListArr(widget.index);
                    }
                  });
                },
              ),
            ),
          ],
        );
      }
    }

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import "package:innovative_world/models/list_model.dart";

class DatabaseService {
  // Collection Reference
  CollectionReference listCollection = Firestore.instance.collection("list");

  // Get current users id
  final String uid;
  DatabaseService({this.uid});

  // Set data to firestore db
  Future setUserData(List<String> list) async {
    return await listCollection.document(uid).setData({ 
      "list": list
    });
  }

  // For deleting the lists
  Future deleteListArr(String index) async {
    return await listCollection.document(uid)
      .updateData({ "list": FieldValue.arrayRemove([index]) });
  }
  


  // UserList snapshot
  UserList _userListFromSnapshot(DocumentSnapshot snapshot) {
    return UserList(
      uid: uid, 
      list: snapshot.data["list"].cast<String>().toList()
      ); 
  } 
  // Stream for user's to do list
  Stream<UserList> get userListStream {
    return listCollection.document(uid).snapshots()
      .map(_userListFromSnapshot);
  }
}

import "package:flutter/material.dart";
import 'package:flutter/rendering.dart';
import "package:innovative_world/services/auth_service.dart";
import "package:innovative_world/models/list_model.dart";
import 'package:innovative_world/services/database_service.dart';
import "package:innovative_world/shared/decoration.dart";
import 'package:innovative_world/shared/loading.dart';
import 'package:provider/provider.dart';
import "package:innovative_world/models/user_model.dart";
import "package:innovative_world/models/list_model.dart";
import 'dart:async';

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  String _text;
  final _formKey = GlobalKey<FormState>();
  List<String> userDoc = [];
  // On every refresh the userDoc starts from 0, so it overrides the data

  @override
  Widget build(BuildContext context) {
    final user = Provider.of<UserId>(context);

    return StreamBuilder<UserList>(
        stream: DatabaseService(uid: user.uid).userListStream,
        builder: (context, snapshot) {
          if (snapshot.hasData) {
            UserList userList = snapshot.data;
            // List<String> userDoc = [userList.list.toString()];
            return Scaffold(
              backgroundColor: Colors.blue[200],
              appBar: AppBar(
                title: Text(
                  "Create List",
                  style: TextStyle(
                    fontSize: 23.0,
                  ),
                ),
                elevation: 0.0,
                actions: <Widget>[
                  FlatButton.icon(
                    onPressed: () {
                      AuthService().signOut();
                    },
                    icon: Icon(Icons.person),
                    label: Text("Sign out"),
                  ),
                ],
              ),
              body: Padding(
                padding: const EdgeInsets.fromLTRB(20.0, 25.0, 20.0, 0.0),
                child: Column(
                  children: <Widget>[
                    Form(
                      key: _formKey,
                      child: Column(
                        children: <Widget>[
                          TextFormField(
                            validator: (val) =>
                                val.isEmpty ? "Enter text" : null,
                            onChanged: (val) => setState(() => _text = val),
                            decoration: InputDecorationConst.copyWith(
                                hintText: "Create List..."),
                          ),
                          RaisedButton(
                            onPressed: () async {
                              if (_formKey.currentState.validate()) {
                                userDoc.add(_text);
                                _formKey.currentState.reset();
                                await DatabaseService(uid: user.uid)
                                    .setUserData(userDoc ?? userList.list);
                              }
                            },
                            color: Colors.pink,
                            child: Text(
                              "Add to list",
                              style: TextStyle(
                                  fontSize: 15.0, color: Colors.white),
                            ),
                          ),
                        ],
                      ),
                    ),
                    SizedBox(height: 15.0),
                    ListView.builder(
                      shrinkWrap: true,
                      itemCount: userList.list.length,
                      itemBuilder: (context, index) {
                        return ForList(listsIndex: userList.list[index], index: index, theList: userList.list);
                      },
                    ),
                  ],
                ),
              ),
            );
          } else {
            return Loading();
          }
        });
  }
}

class ForList extends StatefulWidget {
  final int index;
  final String listsIndex;
  final List<String> theList;

  ForList({ this.listsIndex, this.index, this.theList });

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

class _ForListState extends State<ForList> {
  bool isSelected = false;

  @override
  Widget build(BuildContext context) {
    final user = Provider.of<UserId>(context);

    return Column(
      children: <Widget>[
        Card(
          child: CheckboxListTile(
            title: Text(widget.theList[widget.index]),
            value: isSelected,
            onChanged: (bool val) {
              setState(() {
                isSelected = val;
                Timer(Duration(seconds: 1), () {
                  setState(() async {
                  if (isSelected) {
                    await DatabaseService(uid: user.uid).deleteListArr(widget.listsIndex);
                   
                    }
                  });
                });
              });
            },
          ),
        ),
      ],
    );
  }
}