Firestore: Get subcollection of document found with where

Question

I am trying to get the documents inside an subcollection which is part of an document found with the .where function

Exemple:

• RootColl/
  • Doc A

Answer 1

A sub-collection lives under a specific document. A query as you've shared now points to a number of documents. You'll need to execute the query to determine what documents it points to, then loop over the results, and get the sub-collection for each document.

In code:

var query = db.collection("RootColl").where("field", "==", "1");
query.get().then((querySnapshot) => {
  querySnapshot.forEach((document) => {
    document.ref.collection("SubColl 1").get().then((querySnapshot) => {
      ...
    });
  });
});