允许更新 Firestore 中的单个字段 [英] Allow update on single field in firestore

问题描述

我想授予用户更新文档的权限.但仅当用户更新此文档的一个特定字段时.此用户不应更改所有其他字段.

I want to give a user the right to update a document. But ONLY if the user updates one specific field of this document. All other fields shouldn't be changed by this user.

这可以在 Firestore 中实现吗?

Is this possible in firestore?

我尝试过这样的事情:

function isUpdateToOpenField(attr) {
    return attr == get(/databases/$(database)/documents/stores/$(store)).data.open;
}

allow update: if isUpdateToOpenField(request.resource.data);

但我不知道如何比较更新是否对应于正确的字段.

But I don't know how to compare if the update corresponds to the right field.

推荐答案

Rules 语言中的 Map diffs 被引入来解决这个问题:

Map diffs in the Rules language were introduced to solve this:

function isUpdateToOpenField() {
    return request.resource.data.diff(resource.data).affectedKeys().hasOnly(['open']);
}

allow update: if isUpdateToOpenField();

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