StreamBuilder showing data only on hot reload in flutter

Question

I am facing a problem with Streambuilder. The workflow of my app is like there is a list of items when I press on add to favorites it adds the item to firestore. Then I am fetching data from firestore using stream and showing it on another screen using stream builder. The problem is that the stream builder is empty when I hot reload the app the data shows perfectly. this is the part where I am calling stream method this is streambuilder Thanks.

I have added some part of code please check the edited part. — foreverLearner

Tobotis Tobotis · Accepted Answer · 2021-08-04T08:00:50

Try removing the extra variable resultStream and directly use the function DatabaseManager.getUserCurrency() in your StreamBuilder like this:

StreamBuilder(
   stream: DatabaseManager.getUserCurrency(context),
   builder: (context, snapshot){...}
)

if this does not fix the issue, check your getUserCurrency() function for errors. This is an example for getting a Stream from Firestore:

Stream<UserData> getUserData(String uid) {
  try {
    return userCollection
        .doc(uid)
        .snapshots()
        .map((event) => event?.data() != null ? UserData.fromMap(event.data()) : null);
  } catch (e) {
    print(e);
    return null;
  }
}

Additionally you normally don’t have to await a Stream, which might cause the issue in your case, because you are calling the async function in your initState.

StreamBuilder showing data only on hot reload in flutter

1 Answers