flutter firebase how do I get all the children of a node

问题

I am not very familiar with using dart and firebase and I was wondering how I could get all the children of a certain node and how I could check if a node exists

回答1:

Something like this should you get the list of users:

static Future<int> getUserAmount() async {
  final response = await FirebaseDatabase.instance
      .reference()
      .child("Users")
      .once();
  var users = [];
  reponse.value.forEach((v) => users.add(v));
  print(users);
  return users.length;
}

You can check with users what you need to check and then return a result;

来源：https://stackoverflow.com/questions/49799171/flutter-firebase-how-do-i-get-all-the-children-of-a-node