flutter:检索firebase集合中存在的多个文档id

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^1.11.0
  cloud_firestore: ^2.5.4

import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

Future<List<String>> retrieveDocuments(List<String> documentIds) async {
  final CollectionReference collection = FirebaseFirestore.instance.collection('your_collection');

  List<String> existingDocumentIds = [];
  for (String documentId in documentIds) {
    final DocumentSnapshot document = await collection.doc(documentId).get();
    if (document.exists) {
      existingDocumentIds.add(documentId);
    }
  }

  return existingDocumentIds;
}