Question 120233 in Firebase Question posted in
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Flutter firebase: Bad state: field does not exist within the DocumentSnapshotPlatform

I’m getting this error:

Bad state: field does not exist within the DocumentSnapshotPlatform

with the following code:

static List<Report?> reportListFromSnapshot(QuerySnapshot snapshot) {
    return snapshot.docs.map<Report?>((report) {
      return Report(
        type: report['type'],
        reason: report['reason'],
        reportId: report['id'],
        chat:
            (report['chat'] == null) ? null : Chat.chatFromMap(report['chat']),
        stingray: Stingray.stingrayFromDynamic(report['stingray']),
        reporterUser: User.fromDynamic(report['reporterUser']),
        reportTime: report['reportTime'].toDate(),
      );
    }).toList();
  }

Its failing on the first map,

type: report['type'],

and when i look at it in debug mode, it shows the data i am looking for:
enter image description here

As you can see from the screenshot, ‘type’ exists with a value of ‘chat report’. Any idea why this is breaking?
Thanks!

Tags:

3

Answers


  1. Chosen as BEST ANSWER
    0

    The problem turned out to be larger in scope than i thought. I was uploading a map object to firebase rather than just a document, and that map was attempting to be read, which is where the error occurred due to it only having one value in the document snapshot.


  2. 0

    You are supposed to call .data() on report

    static List<Report> reportListFromSnapshot(QuerySnapshot snapshot) {
  final List<Report> reports = [];
  for (final doc in snapshot.docs) {
    final report = doc.data() as Map<String, dynamic>?; // you missed this line.
    if (report == null) continue;
    reports.push(
      Report(
        type: report['type'] as String,
        reason: report['reason'] as String,
        reportId: report['id'] as String,
        chat: (report['chat'] == null)
            ? null
            : Chat.chatFromMap(report['chat']),
        stingray: Stingray.stingrayFromDynamic(report['stingray']),
        reporterUser: User.fromDynamic(report['reporterUser']),
        reportTime: (report['reportTime'] as Timestamp).toDate(),
      ),
    );
  }
  return reports;
}
// I returned List<Report> not List<Report?>

    Check out this link on how to use withConverter so you do not have to manually convert models.

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  3. 0

    Maybe you have typo in your field which does not match with your model fields. So the idea is that, your fields in your model has to match with the fields in your firebase snapshot fields.
    enter link description here

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