Cloud Firestore和Ionic

本文介绍了Cloud Firestore和Ionic的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如何获取Cloud Firestore中存在的集合的文档ID？

How can I get the document id of a collection present in the cloud Firestore?

我试图通过

firebase.firestore().collection("collectionName").doc().id

但我没有得到适当的结果。

but I didn't get the appropriate result.

推荐答案

firebase.firestore（）。collection（ societies）。doc（）。id，它返回的ID与社会documentId不等价

firebase.firestore().collection("societies").doc().id and it returns a id which is not equivalent to society documentId

这是正确的，因为每次使用上面的代码行时，您都会生成一个 new 文档ID，该ID永远不会与数据库中已经存在的ID相同

That's correct because everytime when you are using the above line of code, you are generating a new document id which will never be the same with one that already exist in your database.

要使用新的文档ID，首先需要生成它（就像已经做的那样），然后将其存储在变量中。有了包含该ID的变量，您可以通过将ID作为参数传递给 doc（id）函数来使用它来从数据库中获取特定文档：

In order to use a new document id, first you need to generate it (as you already do) and then store it in a variable. Having that varaible which holds that id, you can use it to get that particular document from the database by passing this id as an argument to the doc(id) function:

firebase.firestore().collection("societies").doc(this.myId)