CODEWITHSUNDEEP
firebasefluttergoogle-cloud-firestore
Milly Alfaro
Milly Alfaro

Reputation: 309

Why can't I update Firestore string value in Flutter?

I have a button, and when I press it I want it to update a null value with a string. In the code, you will notice a future builder, and just know I need that to determine what I should exactly update depending on the data status in Firestore. When a user is created the value of isPledged is set to null, but as you see by the if statement if that value is null, I want to update it with a string "true". However, when I do so, nothing changes in Firestore with the value remaning null. I'm a bit confused about where I messed up so any help would be much appreciated. Also, I know I could remove the if statement but I'm going to add another option if the value does have data, so that's why that's there.

onPressed: () {
  FutureBuilder(
    future: getPledgedStatus(),
    builder: (_, AsyncSnapshot snapshot) {
    if (!snapshot.hasData) {
      final CollectionReference
      users = FirebaseFirestore.instance.collection('UserNames');
      FirebaseAuth auth = FirebaseAuth.instance;
      String uid = auth.currentUser.uid.toString();
      users.doc(uid).update(
        {'isPledged': "true"}
      );
    }

    },
  );
  Navigator.of(context).pop();
},

Upvotes: 0

Views: 235

Answers (1)

Milly Alfaro
Milly Alfaro

Reputation: 309

Okay so after Muthu Thavamani reminded me that I could simply use the async function instead of a future builder it worked, here's the new code:

onPressed: () async {
  try {
    final CollectionReference users = firestore.collection('UserNames');
    final String uid = auth.currentUser.uid;
    final result = await users.doc(uid).get();

    var isPledged = result.data()['isPledged'];

    if (isPledged == null) {
      FirebaseFirestore.instance.collection('UserNames').doc(uid).update({
        "isPledged": "true",
      });
      Navigator.of(context).pop();
    } else {
      //Something else
    }
  } catch (e) {
    print(e);
  }
}

Upvotes: 2

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