Question

enter image description here 已经尝试了几天从我的 Flutter 应用程序中获取 Firestore 中文档的文档 ID。我想要的是更新或删除文档，但必须先通过他的 id 来识别它。当我打开 Firestore 时，我有该 ID 和其他值，如姓名、地址等。

现在我想了解如何将文档 ID 放入一个变量中，然后在我的函数中使用它来删除或更新文档。

getDocIndex() {
  var documentID = Firestore.instance
      .collection('Requests')
      .document(widget.data['Document ID'].toString())
      .get();
  print(documentID);
}

我知道函数中的小部件不可用。也许有snapshot.data ....但它也被标记为红色。

这是我的功能，然后应该可以工作：

deleteDocument(){

Firestore.instance.collection('Requests').document(documentID).delete();

}

enter image description here enter image description here

Answer 1

getDocIndex() {
  var document = Firestore.instance
      .collection('Requests')
      .document(widget.data['Document ID'].toString())
      .get();
  print(document.id);
}

Answer 2

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:kuechenrechner/card_widget.dart';
import 'package:kuechenrechner/gmaps.dart';
import 'package:geocoder/geocoder.dart';
import 'adminslogin.dart';

//final documentsRef = Firestore.instance.collection('Requests');

class Admins extends StatefulWidget {
  @override
  _AdminsState createState() => _AdminsState();
}

class _AdminsState extends State<Admins> {
  /*geoConvert() async {
// Geocoding for Address
// final query = "1600 Amphiteatre Parkway, Mountain View";
    var addresses = await Geocoder.local.findAddressesFromQuery(query);
    var first = addresses.first;
    print("${first.featureName} : ${first.coordinates}");
  }
*/
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: IconButton(
            icon: Icon(Icons.arrow_back),
            onPressed: () {
              Navigator.push(context,
                  MaterialPageRoute(builder: (BuildContext context) {
                return AdminsLogin();
              }));
            }),
        title: Text(
          'Anfragen',
          style: GoogleFonts.lexendDeca(),
        ),
        centerTitle: true,
        actions: [
          IconButton(
              icon: Icon(Icons.refresh),
              onPressed: () {
                setState(() {});
              })
        ],
      ),
      body: AdminsList(),
    );
  }
}

Future getPosts() async {
  var firestore = Firestore.instance;
  QuerySnapshot qn = await firestore
      .collection("Requests")
      .orderBy('Anfrage vom')
      .getDocuments();

  return qn.documents;
}

//Abfrage DocumentID
getDocIndex() async {
  /* var documentID = Firestore.instance
      .collection('Requests')
      .document(widget.data['Document ID'].toString())
      .get();
  print(documentID);
  */

  var document = await Firestore.instance
      .collection('Requests')
      .document(widget.data['Document ID'].toString())
      .get();
  print(document.id);
}

class AdminsList extends StatefulWidget {
  @override
  _AdminsListState createState() => _AdminsListState();
}

class _AdminsListState extends State<AdminsList> {
  navigateToDetail(DocumentSnapshot post) {
    Navigator.push(context,
        MaterialPageRoute(builder: (context) => AdminsDetails(post: post)));
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: FutureBuilder(
          future: getPosts(),
          builder: (context, snapshot) {
            if (!snapshot.hasData) {
              return Center(
                child: Text('Loading...'),
              );
            } else {
              return ListView.separated(
                reverse: true,
                shrinkWrap: true,
                itemCount: snapshot.data.length,
                itemBuilder: (_, index) {
                  return ListTile(
                    title: Text(
                      '${snapshot.data[index].data['Name']}',
                      style: GoogleFonts.lexendDeca(),
                    ),
                    subtitle: Text(
                      '${snapshot.data[index].data['Anfrage vom']}',
                      style: GoogleFonts.lexendDeca(),
                    ),
                    onTap: () => navigateToDetail(snapshot.data[index]),
                    leading: Icon(
                      Icons.business_center,
                      color: Colors.blue,
                    ),
                    trailing: IconButton(
                        icon: Icon(Icons.sort),
                        onPressed: () {
                          getDocIndex();
                        }),
                  );
                },
                separatorBuilder: (BuildContext context, int index) {
                  return Divider();
                },
              );
            }
          }),
    );
  }
}

class AdminsDetails extends StatefulWidget {
  final DocumentSnapshot post;
  AdminsDetails({this.post});

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

String keyID;

class _AdminsDetailsState extends State<AdminsDetails> {
  //Anfragen löschen intern
  deleteDocument() async {
    /* CollectionReference collectionReference =
        Firestore.instance.collection("Requests");
    QuerySnapshot querySnapshot = await collectionReference.getDocuments();

    querySnapshot.documents[0].reference.delete();
*/

    Firestore.instance.collection('Requests').document(keyID).delete();
  }

  //Anfragen intern ändern, anpassen! Button in der Appbar!
  TextEditingController adminComment = TextEditingController();
  updateData() async {
    CollectionReference collectionReference =
        Firestore.instance.collection("Requests");
    QuerySnapshot querySnapshot = await collectionReference.getDocuments();
    querySnapshot.documents[0].reference
        .updateData({'Administrator Anmerkung': adminComment.text});
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          'Anfrage von ${widget.post.data["Name"]}',
          style: GoogleFonts.lexendDeca(),
        ),
        centerTitle: true,
        actions: [
          IconButton(
              icon: Icon(Icons.edit),
              onPressed: () {
                setState(() {
                  updateData();
                });
              })
        ],
      ),
      body: SingleChildScrollView(
        child: Container(
          child: Padding(
            padding: const EdgeInsets.all(24.0),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Kontaktdaten des Kunden: ',
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.w200),
                ),
                TextButton(
                  onPressed: () => customLaunch(
                      'mailto:${widget.post.data["Email"]}?subject=Feed%20back&body=Write your%20feedback'),
                  child: Text('Email: ${widget.post.data["Email"]}',
                      style: TextStyle(fontSize: 18)),
                ),
                SizedBox(
                  child: Container(color: Colors.amber),
                ),
                TextButton(
                  onPressed: () =>
                      customLaunch('tel: ${widget.post.data["Telefon"]}'),
                  child: Text('Telefon: ${widget.post.data["Telefon"]}',
                      style: TextStyle(fontSize: 18)),
                ),
                Divider(),
                Text(
                  'Kundenanschrift: ',
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.w200),
                ),
                SizedBox(
                  height: 8.0,
                ),
                TextButton(
                  child: Text('${widget.post.data["Anschrift"]}'),
                  onPressed: () => Navigator.push(context,
                      MaterialPageRoute(builder: (BuildContext context) {
                    return MapsDemo();
                  })),
                ),
                SizedBox(
                  height: 8.0,
                ),
                Divider(),
                Text(
                  'Kommentar:',
                  style: TextStyle(fontWeight: FontWeight.w200, fontSize: 18.0),
                ),
                SizedBox(
                  height: 16.0,
                ),
                Text('${widget.post.data["Kommentar"]}',
                    style: GoogleFonts.lexendDeca()),
                Divider(),
                Text(
                  'Details der Anfrage: ',
                  style: TextStyle(fontSize: 18, fontWeight: FontWeight.w200),
                ),
                SizedBox(
                  height: 16.0,
                ),
                Text('Anfrage vom: ${widget.post.data["Anfrage vom"]}',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text('Küchenlänge: ${widget.post.data["Küchenlaenge"]} Meter',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text('Hängeschränke: ${widget.post.data["Hängeschränke"]}',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                    'Gebrauchte Küche: ${widget.post.data["Gebrauchte Küche"]}',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                    'Arbeitsplatte schneiden: ${widget.post.data["Arbeitsplatte bearbeiten"]}',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                    'Anschluss Waschmaschine: ${widget.post.data["Anschluss WaMa"]}',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                    'Anschluss Spülmaschine: ${widget.post.data["Anschluss Spuel"]}',
                    style: GoogleFonts.lexendDeca()),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                  'Anschluss Herd: ${widget.post.data["Anschluss Herd"]}',
                  style: GoogleFonts.lexendDeca(),
                ),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                  'Wunschdatum Montage: ${widget.post.data["Wunschdatum"]}',
                  style: GoogleFonts.lexendDeca(),
                ),
                SizedBox(
                  height: 16.0,
                ),
                Text(
                  'Gesamt geschätzt: ${widget.post.data["Gesamt geschätzt"]} Euro',
                  style: GoogleFonts.lexendDeca(
                      fontSize: 18,
                      fontWeight: FontWeight.bold,
                      decoration: TextDecoration.underline),
                ),
                TextField(
                    controller: adminComment,
                    decoration: InputDecoration(
                      hintText: 'Anmerkung Administrator:',
                    )),
                //Kommentare von Administratoren:
                Container(
                    child: Text(
                  '${widget.post.data['Administrator Anmerkung']}',
                  style: GoogleFonts.lexendDeca(),
                )),
                Column(
                  children: [
                    Center(
                      child: ElevatedButton(
                          style: ElevatedButton.styleFrom(
                            primary: Colors.red,
                          ),
                          onPressed: () {
                            Navigator.push(context, MaterialPageRoute(
                                builder: (BuildContext context) {
                              return AlertDialog(
                                title: Text('Diese Anfrage wirklich löschen?',
                                    style: GoogleFonts.lexendDeca()),
                                actions: [
                                  TextButton(
                                      onPressed: () {
                                        Navigator.pop(context);
                                      },
                                      child: Text('Abbrechen')),
                                  TextButton(
                                      onPressed: () async {
                                        setState(() {
                                          deleteDocument();
                                          Navigator.push(context,
                                              MaterialPageRoute(builder:
                                                  (BuildContext context) {
                                            return Admins();
                                          }));
                                        });
                                      },
                                      child: Text('Löschen')),
                                ],
                              );
                            }));
                          },
                          child: Text('Anfrage löschen')),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

Answer 3

let data = [{"Products":{"xcs2":{"de_DE":{"cat":"45","title":"deutsch - Umrichter","description":"Die Einzelachs-Umrichter .","link":"example.com"},"en_US":{"cat":"4","title":"1ctrlX ","description":"1The single-axis ","link":"1example.com"}},"XCD1":{"de_DE":{"cat":"435","title":"ctrlX ","description":"Die ","link":"example.com"},"en_US":{"cat":"4","title":"2ctrlX ","description":"2The single-axis ","link":"2example.com"}}}}];

const get_found_object = ({ cat: category_id, title, description, link }, material_id) => ({
  material_id, category_id, title, description, link
});

function iterateObject(obj, parent_keys = []) {
  let result = null;
  
  for (prop in obj) { // prop is the key here (should have de_DE and object)
    if (typeof(obj[prop]) == "object") { //  obj[prop] is the  value.
      result = iterateObject(obj[prop], [prop, ...parent_keys]);
      if(result) return result;
    } else if (prop == "cat" && obj[prop] == 4) {
      return get_found_object(obj, parent_keys[1]);
    }
  }
  
  return null;
}

const result = data.reduce((acc, item) => acc || iterateObject(item), null);

console.log(result);

Answer 4

如果您知道文档中的值，则可以使用 where 查询来查找具有这些参数的所有文档。

Firestore.instance.collection('requests').where('Document ID', isEqualTo: "ID")
    .snapshots().listen(
          (data) => print('grower ${data.documents[0]['name']}')
    );

但是，如果您已经可以在本地访问文档数据，则可以从文档快照中提取参考路径（如果您已将其存储在本地）。只是在那时从您的应用中恢复该数据的问题。

Answer 5

谢谢大家！我知道了！

return ListTile(
                        title: Text(
                          '${snapshot.data[index].data['Name']}',
                          style: GoogleFonts.lexendDeca(),
                        ),
                        subtitle: Text(
                          '${snapshot.data[index].data['Anfrage vom']}',
                          style: GoogleFonts.lexendDeca(),
                        ),
                        onTap: () {
                          navigateToDetail(snapshot.data[index]);
                          keyID = snapshot.data[index].data['Document ID'];
                          print(keyID.toString());

下面我在 keyID 中获取文档中的文档 ID 字段。之后我就可以使用带有ID引用的删除功能了。

Firestore.instance.collection('Requests').document(keyID).delete();

获取 Firestore 文档的文档 ID (Flutter)

5 个答案: