如何获取Cloud Firestore集合中的第一个文档(Flutter/Dart)

dependencies:
  cloud_firestore: ^2.5.0

import 'package:cloud_firestore/cloud_firestore.dart';

Future<DocumentSnapshot<Map<String, dynamic>>> getFirstDocument() async {
  QuerySnapshot<Map<String, dynamic>> snapshot = await FirebaseFirestore.instance
      .collection('your_collection_name')
      .limit(1)
      .get();

  if (snapshot.docs.isNotEmpty) {
    return snapshot.docs.first;
  } else {
    return null;
  }
}

void main() async {
  DocumentSnapshot<Map<String, dynamic>> firstDocument = await getFirstDocument();
  if (firstDocument != null) {
    // 处理第一个文档
    print(firstDocument.data());
  } else {
    // 集合中没有文档
    print('集合中没有文档。');
  }
}