CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-firestore
Dragonsnap
Dragonsnap

Reputation: 953

data() is not a function for querying firebase

I've been trying to figure out how to query a Firebase database for a while, but to no avail. Here's what I have right now:

async query(){
    const bar = firebase.firestore().collection('foo');
    const res = await bar.orderBy('gopher').limit(20).get();
}

res isn't the actual data, but rather some sort of internal object:

{
    o_: {
        J_ : {
             fromCache: false,
             ne: true,
             ...
        }
    },
    q_ : {
         ...
    }
}

For the data structure, I have a collection called foo, and multiple documents with unique ids - which each have a numerical field called gopher. I'm trying to sort by gopher and get 20 documents at the top, but res.data() is not a function and res.data is undefined.

Upvotes: 0

Views: 1117

Answers (2)

Doug Stevenson
Doug Stevenson

Reputation: 317352

res is a QuerySnapshot type object. If you want to see the results of the query, you can get the raw data using the pattern described in the documentation. I've renamed the variables to be more descriptive.

const fooCollection = firebase.firestore().collection('foo');
const querySnapshot = await fooCollection.orderBy('gopher').limit(20).get();
if (querySnapshot.size > 0) {
    querySnapshot.forEach(function(doc) {
        console.log(doc.id, " => ", doc.data());
    });
}
else {
    console.log("No documents in the results");
}

Upvotes: 2

JustRaman
JustRaman

Reputation: 1161

It should be res.docs not res.data

res.docs contains array firestore document snapshot.

To print all the data

console.log(res.docs.map(snap=>snap.data()));

Upvotes: 0

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