Firestore按时间排序，但按ID排序 [英] Firestore order by time but sort by ID

问题描述

我一直试图找到一种查询文档列表的方法，其中我在一个字段上具有范围过滤器，而在另一个字段中排序，这当然是不可能的，请参见我的另一个问题:

I have been trying to figure out a way to query a list of documents where I have a range filter on one field and order by another field which of course isn't possible, see my other question: Order by timestamp with range filter on different field Swift Firestore

但是是否可以将带有时间戳的文档保存为id，然后默认将其排序?还是对ID进行硬编码，然后检索上一个创建的文档ID，然后将ID增加一个，以便下一个要上传的帖子?

But is it possible to save documents with the timestamp as id and then it would sort by default? Or maybe hardcode an ID, then retrieve the last created document id and increase id by one for the next post to be uploaded?

这显示了如何在集合中对文档进行排序

This shows how the documents is ordered in the collection

有什么想法如何存储文档，以便按集合中的创建顺序对其进行排序?

Any ideas how to store documents so they are ordered by created at in the collection?

推荐答案

Firebase控制台中显示的文档顺序与使用Firestore的代码的功能无关.该控制台仅用于浏览数据，并且该排序方案使其相对直观(如果您知道其ID)就可以找到您要查找的文档.您无法在控制台中更改此排序顺序.

The order of the documents shown in the Firebase console is mostly irrelevant to the functioning of your code that uses Firestore. The console is just for browsing data, and that sorting scheme makes it relatively intuitive to find a document you might be looking for, if you know its ID. You can't change this sort order in the console.

您的代码显然将有其他要求，这些要求应编码到您的查询中，而不考虑您在仪表板上看到的任何排序顺序.如果要对文档进行基于时间的排序，则必须在文档中存储某种时间戳字段，并将其用于排序.我不建议将时间戳记用作文档的ID，因为将来可能会给您带来麻烦.

Your code is obviously going to have other requirements, and those requirements should be coded into your queries, without regarding any sort order you see in the dashboard. If you want time-based ordering of your documents, you'll have to store some sort of timestamp field in the document, and use that for ordering. I don't recommend using the timestamp as the ID of a document, as that could cause problems for you in the future.

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