Firestore：按文档数组中的项目查询 [英] Firestore: Query by item in array of document

问题描述

我有一个文档用户，它的键名为照片。这是一个要保存的字符串数组，即照片文档的ID。

I have a document "user" which has a key called "photos". Here is an array of strings being saved, namely the IDs of the "photo" documents.

我想通过照片字段查询用户：我想要所有在照片属性中拥有此ID的用户。

I want to query "user" by this "photos" field: I want all users who have this ID in the "photos" property.

是否可以通过Firestore做到这一点？

Is this possible through firestore?

推荐答案

添加了与 .where（）一起使用的数组包含查询运算符，以查找其中数组字段包含特定元素的文档。

Added 'array-contains' query operator for use with .where() to find documents where an array field contains a specific element.

https：// firebase .google.com / support / release-notes / js 5.3.0

更新：也可以在<$ c $中使用c> @ google-cloud / firestore ： https ：//github.com/googleapis/nodejs-firestore/releases/tag/v0.16.0

更新2 https://firebase.googleblog.com/2018/08/better-arrays-in-cloud-firestore.html

更新3 现在可以在Admin Node.js SDK v6.0.0中使用 https://github.com/firebase/firebase-admin-node/releases

Update 3 now available in Admin Node.js SDK v6.0.0 https://github.com/firebase/firebase-admin-node/releases

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