CODEWITHSUNDEEP
javascriptfirebasereact-nativegoogle-cloud-firestore
Marko
Marko

Reputation: 545

firebase where() not returning that docs data?

Here's what I'm trying to do, I'm trying to get the username of a user. I have the users email so I'm trying to search documents to find the document where that is the email, then get the username from that.

Code:

useEffect(() => {
        auth().onAuthStateChanged((user) => {
            if (user) {
                // User logged in already or has just logged in.
                updateUser(user.email)
            } else {
                // User not logged in or has just logged out.
            }
        });

        //get the username here
        firestore().collection('users').where("email", "==", userCurrent).get().then((doc) => {
            console.log(doc)
        }).catch((error) => { console.log(error) })
    })

when I try and do doc.data(), i get doc.data is not a function. When I try and remove that and just call doc to see what is printed out, I get this massive data dump:

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Just want to get access to the data for the document that's email field == the current user's email

Edit:

firestore().collection('users').where("email", "==", userCurrent).get()
            .then((querySnapshot) => {
                querySnapshot.forEach(doc => {
                    console.log(doc.data())
                })
            })
            .catch((error) => { console.log(error) })

Upvotes: 1

Views: 634

Answers (1)

Doug Stevenson
Doug Stevenson

Reputation: 317712

When you call get() on a Query object:

firestore().collection('users').where("email", "==", userCurrent).get()

It will yield a QuerySnapshot object (not a DocumentSnapshot). That QuerySnapshot can contain 0 or more documents. Even if you think it will contain a single document, you should at least check to see if it contains more than one document:

firestore().collection('users').where("email", "==", userCurrent).get()
.then((querySnapshot) => {
    if (querySnapshot.docs.length > 0) {
        const documentSnapshot = querySnapshot.docs[0];
        console.log(documentSnapshot.data());
    }
    else {
        // decide what you want to do if the query resulted in no documents.
    }
})
.catch((error) => { console.log(error) })

You should also know that onAuthStateChanged is asynchronous and returns immediately, before any user object is known. Your query might be in the wrong place if you're hoping to execute it only after a sign-in is complete.

Upvotes: 4

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