Firebase Cloud Functions Check Db For Non-existant Data

I'm looking for how to check if a documents exists in my cloud functions My functions belows works fine when just incrementing an existing value, but now I'm trying to add function

Solution 1:

It seems like docRef either points to a collection or is a query. In that case your snapshot is of type QuerySnapshot.

To check if a query has any result, use QuerySnapshot.empty.

Solution 2:

I kept getting errors saying either empty or exists were not functions (tried many iterations) so eventually I landed on just using an undefined check and it works perfectly.

var db = event.data.ref.firestore;

    var docRef = db.collection(userID).doc("joined").collection("total").doc("count");


    var getDoc = docRef.get()
        .then(snapshot => {
            console.log("augu1", snapshot)
            if (snapshot._fieldsProto === undefined) {
                console.log("digimon1")
                docRef.set({
                        count: 1
                    });
            }
            else {      
                console.log("haha31", snapshot._fieldsProto.count)

                var count = Number(jsonParser(snapshot._fieldsProto.count, "integerValue"));

                docRef.set({
                        count: count + 1
                    });
            }

        });

Solution 3:

It turns out the problem is much simpler than I imagined: DocumentSnapshot.exists is a read-only property, not a function. So the proper way to use it is:

if snapshot.exists()