getData (ordering)

Firestore.instance
        .collection('collection_name')
        .orderBy('field_name', descending: true)
        .orderBy('field_name')

getData (all code)

• init state
• sub collection
• data ordering

  @override
  void initState() {
    super.initState();
    
    ...

    Firestore.instance
        .collection('collection_name')
        .document(_user.uid)
        .collection('collection_name')
        .orderBy('field_name', descending: true)
        .orderBy('field_name')
        .snapshots()
        .listen((data) {
      setState(() {
        _localEvents.clear();
        var datas = data?.documents ?? [];
        ...
      }
    }
  }

cf

https://firebase.google.com/docs/firestore/query-data/order-limit-data?hl=ko