firestore交易引发更新规则错误，该规则仅允许一个特定字段

问题描述

通过在网络上执行firestore runTransaction函数，它在下面发生错误.

by execution of firestore runTransaction function on the web,it occurs error below.

firestore.googleapis.com/v1beta1/projects/myproject/databases/(默认)/documents:commit:1 POST https://firestore.googleapis.com/v1beta1/projects/myproject/databases/(默认)/documents:commit 403

firestore.googleapis.com/v1beta1/projects/myproject/databases/(default)/documents:commit:1 POST https://firestore.googleapis.com/v1beta1/projects/myproject/databases/(default)/documents:commit 403

我只允许每个人更新一个字段，而其他则是登录用户的字段.

i want to allow only update one field for everyone and others are for login user.

因此更新规则将使用下一个.

so update rule uses next.

allow update: if request.resource.data.keys().hasOnly(["numPlayed"])
|| request.auth.uid != null;

和类似的交易代码

this.db.runTransaction(function(t) {
    return t.get(pubRef)
    .then(function(pub) {
        var numPlayed = pub.data().numPlayed + 1;
        t.update(pubRef, { numPlayed: numPlayed });
        return numPlayed;
    });
})

为什么会发生错误?

推荐答案

我终于明白了原因."runTransaction"要求写权限不像更新那样分散.

I finally got the reason.'runTransaction' requires write authority not a divided like update.

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