Firestore orderBy Timestamp DESC

user_4499844 0
Viewed 9683

I'm trying to display the data from Firestore order by timestamp descending order, I follow the documentation but it seems that I did something wrong.

This is my try: 

const outputSnapShot = {};
        this.subscribe = firebase
            .firestore()
            .collection('orders')
            .where('restaurant_code', '==', this.state.restaurantCode)
            .orderBy('timestamp', 'desc')
            .onSnapshot((doc) => {
                doc.docs.map(function(documentSnapshot) {
                    return (outputSnapShot[documentSnapshot.id] = documentSnapshot.data());
                });
                if (this._isMounted) {
                    this.setState({ dataSource: Object.entries(outputSnapShot) });
                }
            });

the result from previous code is the data order by id ASC , Also I finish the INDEXING from Firebase console like so:

enter image description here

I hope I explained the issue clearly. Thanks

google-cloud-firestore react-native sorting javascript
1 Answers

With a help by my friend, we came with this solution and made the code work as we expected:

Going to share this:

this.subscribe = firebase
        .firestore()
        .collection('orders')
        .where('restaurant_code', '==', this.state.restaurantCode)
        .orderBy('timestamp', 'desc')
        .onSnapshot((docSnapshot) => {
            const dataSource = [];
            docSnapshot.forEach((doc) => {
                dataSource.push(doc.data());
            });
            if (this._isMounted) {
                this.setState({ dataSource });
            }
        });
user_44998440
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