javascript - Firestore 快照未正确更新

Question

我想知道如果该函数再次运行，是否正在刷新 Firestore 文档快照。

在这里，我试图读取返回 bool 值的“事件”属性。

不幸的是，如果我手动将文档中的值更改为“false”，读数仍然显示“true”，即使在重新加载(并且应该重新运行函数)之后也是如此。

// Check if user is logged in
auth.onAuthStateChanged(user => {
    if (user) {
        findSubscription(user);
    } else {
        console.log('logged out')
    }
})

const findSubscription = (user) => {

    // Get document
    db.collection('stripe_customers')
        .doc(user.uid)
        .collection('subscription_info')
        .doc('subscription_object')
        .get()
        .then((doc) => {

            // Get number of keys in document
            const numberOfKeys = Object.keys(doc.data()).length;

            // Check if numverOfKeys is > 0 (it is not if the user has never had a subscription before)
            if (numberOfKeys !== 0) {

                // Get subscription status
                const subscriptionStatus = doc.data().subscription.plan.active;
                console.log(subscriptionStatus);

偶尔我会收到以下控制台日志。

"XMLHttpRequest cannot load ('google api url') due to access control checks."

我的数据库仍处于测试的公共(public)模式，所以我不太确定这是怎么回事。

Answer 1

您需要调用 onSnapshot() 而不是 get() ( https://firebase.google.com/docs/firestore/query-data/listen )

let unsubscribe = null;

const addSubscription = (user) => {
    // Subscribe to document updates 
    // (called immediately & every subsequent change) 
    unsubscribe = db.collection('stripe_customers')
        .doc(user.uid)
        .collection('subscription_info')
        .doc('subscription_object')
        .onSnapshot((doc) => { ... })
}