CODEWITHSUNDEEP
node.jsfirebasefirebase-realtime-databasegoogle-cloud-functions
e.iluf
e.iluf

Reputation: 1659

how to fix firebase function Unhandled error Error

i am trying to fetch firebase database in functions but I can't figure out what's causing the error. here's my code

exports.test = functions.https.onCall(async (data, context) => {
console.log(data)
const sessionID = data.sessionID

const snapshot = await admin.database().ref('/test/'+sessionID).once('v‌​alue');
 console.log(snapshot);
 return snapshot

})

this is how I am calling it from client side javascript

function callServer(){

    var signInCartIn = firebase.functions().httpsCallable('signInCartIn');

        var cartInfo = {
            "sessionID":"23234",
            "log":"6425",
            "cuso_id":"cus_IP83EOJ9843s",
            "pjo_id":"tm_1HoKt34xY1b"
        }

        signInCartIn(paymentInfo).then(function(result) {
          // Read result of the Cloud Function.

 
        }).catch(function(error) {
          // Getting the Error details.
          var code = error.code;
          var message = error.message;
          var details = error.details;

          console.log(message)
          // ...
        })

}

I keep getting this error when I call the function

Unhandled error Error: Query.once failed: First argument must be a valid event type = "value", "child_added", "child_removed", "child_changed", or "child_moved".

what is causing the error and how can I fix it?

Upvotes: 1

Views: 585

Answers (1)

Stratubas
Stratubas

Reputation: 3067

What seems to be value is not really value.

There are hidden characters in there, a \u200c and a \u200b.

Looks like a nasty copy-paste. Delete it and type it yourself.

const yourValue = 'v‌​alue';
const realValue = 'value';

const yourCharCodes = yourValue.split('').map(c => c.charCodeAt(0)).join(',');
const realCharCodes = realValue.split('').map(c => c.charCodeAt(0)).join(',');
console.log('yourCharCodes:', yourCharCodes);
console.log('realCharCodes:', realCharCodes);

Upvotes: 2

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