I've been struggling to understand why my Firebase cloud function isn't working.
I'm deleting a reserved number in a collection called 'anglerNumbers' when a new user has registered and when that users' document has been created. I use this on the client to make sure a reserved number can't be used twice. I'm following the documentation here: https://firebase.google.com/docs/firestore/query-data/queries?authuser=0 (Using Node.js)
But I keep getting the Error: TypeError: snapshot.forEach is not a function
Here's the function:
exports.newUser = functions.firestore.document('users/{userId}')
.onCreate((snap, context) => {
const newUserNumber = snap.data().anglerNumber;
const anglersRef = admin.firestore().collection('anglerNumbers');
const snapshot = anglersRef.where('anglerNumber', '==', newUserNumber).get();
if (snapshot.empty) {
console.log('No matching documents.');
return;
}
snapshot.forEach(doc => {
console.log(doc.id, '=>', doc.data());
doc.delete();
});
})
It does not console log 'No matching documents'. So there are documents but I can't perform the forEach as indicated by the documentation. What am I missing? Thanks!
in this line in your code:
const snapshot = anglersRef.where('anglerNumber', '==', newUserNumber).get();
You assume that get resolves immediately to a snapshot but in fact get() returns a promise that will resolve into a snap shot. You need to wait for this async function.
Either use await if that is possible in your context or use:
anglersRef.where('anglerNumber', '==', newUserNumber).get().then((snapshot)=>{
//do you processing
});
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