Firestore query subcollections

Question

I thought I read that you can query subcollections with the new Firebase Firestore, but I don\'t see any examples. For example I have my Firestore setup in the following way

Answer 1

I have found a solution. Please check this.

var museums = Firestore.instance.collectionGroup('Songs').where('songName', isEqualTo: "X");
        museums.getDocuments().then((querySnapshot) {
            setState(() {
              songCounts= querySnapshot.documents.length.toString();
            });
        });

And then you can see Data, Rules, Indexes, Usage tabs in your cloud firestore from console.firebase.google.com. Finally, you should set indexes in the indexes tab.

Fill in collection ID and some field value here. Then Select the collection group option. Enjoy it. Thanks