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Checking Firebase database for a key without downloading parent node?

I have a Firebase realtime database that's structured like this:

referrals
 Test1: 0
 Test2: 0

I'm trying to check if "referral_code" exists in the database, this is the code I'm using:

exports.validateReferral = functions.https.onCall((data, context) => {
    const referral_code = data.ref
    console.log("Cloud verifying referral code, code is " + referral_code)
    admin.database().ref().child("referrals").once("value", snapshot => {
        if (snapshot.hasChild(referral_code)) {
            console.log("referral code is valid");
            return true
        } else {
            console.log("referral code is not valid");
            return false
        }
    })
})

When I run it, it shows "Cloud verifying referral code, code is Test1" but it also returns not valid despite the key being in the database.

Any idea how I can debug this? I tried logging the value of "snapshot" but none of the contents of Firebase snapshots show the actual values. Can anyone help me figure out how to locate the problem?

almost 3 years ago · Juan Pablo Isaza
1 Respuestas
Responde la pregunta

0

You're missing a return at the top level of your code:

// 👇
return admin.database().ref().child("referrals").once("value").then((snapshot) => {
    if (snapshot.hasChild(referral_code)) {
        console.log("referral code is valid");
        return true
    } else {
        console.log("referral code is not valid");
        return false
    }
})

Without the top-level return, the return value from the asynchronous callback never reaches your client, and (worse) the code probably gets terminated before the result is ever read from the database.


But I recommend also changing the code to not download the entire referrals node just to check if one key exists. This accomplish the same and only downloads (at most) a single child node:

// 👇                                                👇
return admin.database().ref().child("referrals").child(referral_code).once("value").then((snapshot) => {
    //   👇 
    if (snapshot.exists()) {
        console.log("referral code is valid");
        return true
    } else {
        console.log("referral code is not valid");
        return false
    }
})
almost 3 years ago · Juan Pablo Isaza Denunciar
Responde la pregunta
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