Flutter Firestore Nested Query

Question

Is there a way to read a nested collection in Firestore using Flutter? I have the following data structure

Users:
 - userId:
     - name: value,
     - surname: value;
     - addresses:
         - addressId:
              - street:value,
              - city: value

I can read the first collection with the following code:

Firestore.instance.collection("users").document("userId")
        .snapshots().listen((snapShot) {});

Is there a way for me to access the addresses from the code above or must I run another command that directly gets the addresses like below:

Firestore.instance.collection("users").document("userId").
        collections("addresses").snapshots().listen((snapShot) {});

Firestore.instance .collection('abc') .document("aa") . collection('xyz') .getDocuments() .then((QuerySnapshot snapShot) { snapShot.documents.forEach((doc) { print('${doc.documentID}'); print(('${ei.data['name of your field']}')); }); }); — Speedy11, Dec 13 '19 at 14:45

score 4 · Accepted Answer · answered Jun 16 '18 at 13:25

4

Reading a document from Firestore does not automatically read data from subcollections of that document. If you want the data from the subcollections, you willl need to do an additional read for that.

answered Jun 16 '18 at 13:25

Frank van Puffelen

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score 1 · Answer 2 · answered Jun 27 '18 at 07:51

I am reading a nested collection in Firestore to populate an Expansion widget. See my solution in https://stackoverflow.com/a/51057195/5013735

The trick is in to create a structure like:

  List<Widget> _getChildren() {
    List<Widget> children = [];
    documents.forEach((doc) {
      children.add(
        ProjectsExpansionTile(
          name: doc['name'],
          projectKey: doc.documentID,
          firestore: firestore,
        ),
      );
    });
    return children;
  }

Flutter Firestore Nested Query

2 Answers2