如何使用Flutter删除Firestore中集合中的所有文档 [英] How to Delete all documents in collection in Firestore with Flutter

问题描述

我有一个Firestore数据库.我的项目插件:

I have a firestore database. My project plugins:

cloud_firestore:^ 0.7.4 firebase_storage:^ 1.0.1

cloud_firestore: ^0.7.4 firebase_storage: ^1.0.1

这有一个包含多个文档的邮件"集合. 我需要删除邮件集中的所有文档.但是此代码失败:

This have a collection "messages" with a multiple documents. I need to delete all documents in the messages collection. But this code fail:

Firestore.instance.collection('messages').delete();

但删除未定义

正确的语法如何?

推荐答案

啊.第一个答案是几乎是正确的.该问题与dart中的map方法及其与Futures的工作方式有关.无论如何，尝试像这样使用for循环，您应该会很好:

Ah. The first answer is almost correct. The issue has to do with the map method in dart and how it works with Futures. Anyway, try using a for loop instead like so and you should be good:

firestore.collection('messages').getDocuments().then((snapshot) {
  for (DocumentSnapshot ds in snapshot.documents){
    ds.reference.delete();
  });
});

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