Firestore query documents with only collections inside

Question

I have a firestore collection which has some documents inside it. The documents contains only collections not any fields. So when I try to get all documents inside the root coll

Answer 1

Adapted from Get Data with Cloud Firestore

db.collection("transactions").doc("2018-01-02").collection("education-1").get()
    .then(function(querySnapshot) {
        querySnapshot.forEach(function(doc) {
            // doc.data() is never undefined for query doc snapshots
            console.log(doc.id, " => ", doc.data());
        });
    })
    .catch(function(error) {
        console.log("Error getting documents: ", error);
    });