The operator '[]' isn't defined for the type 'Object'

user_12781880 0
Viewed 8594

I'm trying to get documents in brews collection from Firestore.

What is wrong with my code?

Help me somebody who is used to Flutter and Firebase.

////brew list from snapshot
List<Brew> _brewListFromSnapshot(QuerySnapshot snapshot) {
    return snapshot.docs.map((document) {
      return Brew(
        name: document.data()['name'] ?? '',
        strenght: document.data()['strength'] ?? 0,
        sugars: document.data()['sugars'] ?? '0',
      );
    }).toList();
  }

Attached screenshots regarding error:

google-cloud-firestore firebase flutter snapshot
2 Answers

According to the cloud_firestore plugin github:

/// A [DocumentSnapshot] contains data read from a document in your [FirebaseFirestore]
/// database.
///
/// The data can be extracted with the data property or by using subscript
/// syntax to access a specific field.

So perhaps this modification to your code would work:

List<Brew> _brewListFromSnapshot(QuerySnapshot snapshot) {
    return snapshot.docs.map((document) {
      return Brew(
        name: document['name'] ?? '',
        strength: document['strength'] ?? 0,
        sugars: document['sugars'] ?? '0',
      );
    }).toList();
  }
user_68419620

You're probably looking for document.data[] instead of document.data()[]

document.data is a getter that returns Map<String, dynamic>, so you'd just query it as document.data['someKey'] instead of document.data()['someKey']

So this code should work:

List<Brew> _brewListFromSnapshot(QuerySnapshot snapshot) {
    return snapshot.docs.map((document) {
      return Brew(
        name: document.data['name'] ?? '',
        strength: document.data['strength'] ?? 0,
        sugars: document.data['sugars'] ?? '0',
      );
    }).toList();
  }
user_68419620
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