firestore交易引发更新规则错误，该规则仅允许一个特定字段 [英] firestore transaction throws error for update rule which allows only has one specific field

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

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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