database - 尝试使用 Flutter 中的 Dart 从 Firestore 集合中的文档访问和打印数据时出现错误状态错误？

Question

这是错误：

引发了以下断言：_MapStream<QuerySnapshot<Map<String, dynamic>> 引发异常，List<WeightliftingLogs?>> 被监听

StreamProvider<List<WeightliftingLogs?>>，但没有catchError提供。

异常：错误状态：DocumentSnapshotPlatform 中不存在字段

这是我的代码：

final CollectionReference usersCollection = FirebaseFirestore.instance.collection('users');
var wLCollection = FirebaseFirestore.instance.collectionGroup('Weightlifting');

List<WeightliftingLogs?> _WLlistFromSnapshot(QuerySnapshot snapshot){
return snapshot.docs.map((doc){
  return WeightliftingLogs(
      date: doc.get('date') ?? Timestamp.now(),
      deadLiftWeight: doc.get('deadLiftWeight') ?? 0,
    deadLiftReps: doc.get('deadLiftReps') ?? 0,
    backSquatWeight: doc.get('backSquatWeight') ?? 0,
    backSquatReps: doc.get('backSquatReps') ?? 0,
    hipThrustWeight: doc.get('hipThrustWeight') ?? 0,
    hipThrustReps: doc.get('hipThrustReps') ?? 0,
    legPressWeight: doc.get('legPressWeight') ?? 0,
    legPressReps: doc.get('legPressReps') ?? 0,
    benchPressWeight: doc.get('benchPressWeight') ?? 0,
    benchPressReps: doc.get('benchPressReps') ?? 0,
    lateralPulldownWeight: doc.get('lateralPulldownWeight') ?? 0,
    lateralPulldownReps: doc.get('lateralPulldownReps') ?? 0,
    bicepCurlWeight: doc.get('bicepCurlWeight') ?? 0,
    bicepCurlReps: doc.get('bicepCurlReps') ?? 0,
    tricepExtensionWeight: doc.get('tricepExtensionWeight') ?? 0,
    tricepExtensionReps: doc.get('tricepExtensionReps') ?? 0
  );
}).toList();
}

Stream<List<WeightliftingLogs?>> get WLlogs {
return wLCollection.snapshots()
    .map(_WLlistFromSnapshot);
}

这是用户注册时创建新的举重日志时的代码：

Future newWeightliftingLog(Timestamp date, int deadLiftWeight, int deadLiftReps, int backSquatWeight, int backSquatReps, int hipThrustWeight, int hipThrustReps, int legPressWeight, int legPressReps, int benchPressWeight, int benchPressReps, int lateralPulldownWeight, int lateralPulldownReps, int bicepCurlWeight, int bicepCurlReps, int tricepExtensionWeight, int tricepExtensionReps) async {
return await usersCollection.doc(uid).collection('Weightlifting').doc().set({
  'date': date,
  'deadLiftWeight': deadLiftWeight,
  'deadLiftReps': deadLiftReps,
  'backSquatWeight': backSquatWeight,
  'backSquatReps': backSquatReps,
  'hipThrustWeight': hipThrustWeight,
  'hipThrustReps': hipThrustReps,
  'legPressWeight': legPressWeight,
  'legPressReps': legPressReps,
  'benchPressWeight': benchPressWeight,
  'benchPressReps': benchPressReps,
  'lateralPulldownWeight': lateralPulldownWeight,
  'lateralPulldownReps': lateralPulldownReps,
  'bicepCurlWeight': bicepCurlWeight,
  'bicepCurlReps': bicepCurlReps,
  'tricepExtensionWeight': tricepExtensionWeight,
  'tricepExtensionReps': tricepExtensionReps,
});

}

这是我的举重日志类：

class WeightliftingLogs {
   final Timestamp date;
   final int deadLiftWeight;
   final int deadLiftReps;
   final int backSquatWeight;
   final int backSquatReps;
   final int hipThrustWeight
   final int hipThrustReps;
   final int legPressWeight;
   final int legPressReps;
   final int benchPressWeight;
   final int benchPressReps;
   final int lateralPulldownWeight;
   final int lateralPulldownReps;
   final int bicepCurlWeight;
   final int bicepCurlReps;
   final int tricepExtensionWeight;
   final int tricepExtensionReps;
WeightliftingLogs ({
   required this.date,
required this.deadLiftWeight, required this.deadLiftReps, required this.backSquatWeight, required this.backSquatReps, required this.hipThrustWeight, required this.hipThrustReps, required this.legPressWeight, required this.legPressReps, required this.benchPressWeight, required this.benchPressReps, required this.lateralPulldownWeight, required this.lateralPulldownReps, required this.bicepCurlWeight, required this.bicepCurlReps, required this.tricepExtensionWeight, required this.tricepExtensionReps, }); }

这是我打印它们的地方：

final logs = Provider.of<List<WeightliftingLogs?>>(context);
logs.forEach((weightliftinglog){
  print(weightliftinglog!.date);
  print(weightliftinglog.deadLiftWeight);
  print(weightliftinglog.deadLiftReps);
  print(weightliftinglog.backSquatWeight);
  print(weightliftinglog.backSquatReps);
  print(weightliftinglog.hipThrustWeight);
  print(weightliftinglog.hipThrustReps);
  print(weightliftinglog.legPressWeight);
  print(weightliftinglog.legPressReps);
  print(weightliftinglog.benchPressWeight);
  print(weightliftinglog.benchPressReps);
  print(weightliftinglog.lateralPulldownWeight);
  print(weightliftinglog.lateralPulldownReps);
  print(weightliftinglog.bicepCurlWeight);
  print(weightliftinglog.bicepCurlReps);
  print(weightliftinglog.tricepExtensionWeight);
  print(weightliftinglog.tricepExtensionReps);

});

这是我在用户注册时为所有数据字段初始化默认值的方法：

final Timestamp now = Timestamp.now();
 
  await DatabaseService(uid: user!.uid).newWeightliftingLog(now, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0 ,0 ,0 ,0);

标签： databasefirebaseflutterdartgoogle-cloud-firestore