Type adapter throws not enough byte error on read after write

[aswinmohanme]

I have a tasks model annotated with hive.

import 'package:hive/hive.dart';

part 'task.g.dart';

@HiveType()
class Task {
  @HiveField(0)
  String title;
  @HiveField(1)
  bool done;
  @HiveField(2)
  int id;

  Task({this.title, this.done});
}

Here is the repo that handles these tasks files

class TasksRepo {
  static const _TASKS_KEY = "tasks";
  List<Task> tasks;

  Box tasksBox;
  final Function() rebuildWidget;

  TasksRepo({this.rebuildWidget});

  openTasksBox() async {
    tasksBox = await Hive.box('tasksBox');
    tasksBox.watch().listen((e) {
      rebuildWidget();
    });
  }

  getTasks() async {
    if (tasksBox == null) {
      await openTasksBox();
    }
    tasks = await tasksBox.get(_TASKS_KEY, defaultValue: [
      Task(title: "Create new Task", done: false),
      Task(title: "Do that task", done: false),
      Task(title: "Mark task as Done", done: true),
    ]);
    return tasks;
  }

  void closeBox() async {
    await tasksBox.close();
  }

  void toggleTaskDone(Task task) async {
    tasks = await getTasks();
    var index = tasks.indexWhere((t) => t.title == task.title);
    task.done = !task.done;
    tasks[index] = task;
    tasksBox.put(_TASKS_KEY, tasks);
  }

  clearCompleted() async {
    tasks = await getTasks();
    tasks.removeWhere((task) => task.done);
    tasksBox.put(_TASKS_KEY, tasks);
  }

  void addTask(String title) async {
    tasks = await getTasks();
    tasks.insert(0, Task(done: false, title: title));
    tasksBox.put(_TASKS_KEY, tasks);
  }
}

On the first launch of the application, everything works as expected I can add tasks and clear them. But on the second launch, the application throws this error.

I/flutter ( 6440): 
E/flutter ( 6440): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: RangeError: Not enough bytes available.
E/flutter ( 6440): #0      BinaryReaderImpl._requireBytes (package:hive/src/binary/binary_reader_impl.dart:31)
E/flutter ( 6440): #1      BinaryReaderImpl.viewBytes (package:hive/src/binary/binary_reader_impl.dart:49)
E/flutter ( 6440): #2      BinaryReaderImpl.readString (package:hive/src/binary/binary_reader_impl.dart:102)
E/flutter ( 6440): #3      TaskAdapter.read (package:lessphone/app/tasks/task.g.dart:16)
E/flutter ( 6440): #4      BinaryReaderImpl.read (package:hive/src/binary/binary_reader_impl.dart:228)
E/flutter ( 6440): #5      BinaryReaderImpl.readList (package:hive/src/binary/binary_reader_impl.dart:175)
E/flutter ( 6440): #6      BinaryReaderImpl.read (package:hive/src/binary/binary_reader_impl.dart:219)
E/flutter ( 6440): #7      Frame.decodeBody (package:hive/src/binary/frame.dart:119)
E/flutter ( 6440): #8      readFramesFromFile (package:hive/src/io/frame_io_helper.dart:67)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #9      StorageBackendVm.initialize (package:hive/src/backend/storage_backend_vm.dart:87)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #10     BoxImpl.initialize (package:hive/src/box/box_impl.dart:88)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #11     openBox (package:hive/src/backend/storage_backend_vm.dart:32)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #12     HiveImpl.box (package:hive/src/hive_impl.dart:50)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #13     TasksRepo.openTasksBox (package:lessphone/app/tasks/tasks_repo.dart:15)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #14     TasksRepo.getTasks (package:lessphone/app/tasks/tasks_repo.dart:23)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #15     TasksRepo.addTask (package:lessphone/app/tasks/tasks_repo.dart:52)
E/flutter ( 6440): <asynchronous suspension>
E/flutter ( 6440): #16     _TasksScreenState.build.<anonymous closure>.<anonymous closure> (package:lessphone/app/ui/tasks_screen.dart:56)
E/flutter ( 6440): #17     _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:635)
E/flutter ( 6440): #18     _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:711)
E/flutter ( 6440): #19     GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182)
E/flutter ( 6440): #20     TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:365)
E/flutter ( 6440): #21     TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:312)
E/flutter ( 6440): #22     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156)
E/flutter ( 6440): #23     _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:222)
E/flutter ( 6440): #24     _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198)
E/flutter ( 6440): #25     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156)
E/flutter ( 6440): #26     _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102)
E/flutter ( 6440): #27     _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86)
E/flutter ( 6440): #28     _rootRunUnary (dart:async/zone.dart:1136)
E/flutter ( 6440): #29     _CustomZone.runUnary (dart:async/zone.dart:1029)
E/flutter ( 6440): #30     _CustomZone.runUnaryGuarded (dart:async/zone.dart:931)
E/flutter ( 6440): #31     _invoke1 (dart:ui/hooks.dart:250)
E/flutter ( 6440): #32     _dispatchPointerDataPacket (dart:ui/hooks.dart:159)
E/flutter ( 6440): 

[aswinmohanme]

Here is my generated 'g.part'

// GENERATED CODE - DO NOT MODIFY BY HAND

part of 'task.dart';

// **************************************************************************
// TypeAdapterGenerator
// **************************************************************************

class TaskAdapter extends TypeAdapter<Task> {
  Task read(BinaryReader reader) {
    var obj = Task();
    var numOfFields = reader.readByte();
    for (var i = 0; i < numOfFields; i++) {
      switch (reader.readByte()) {
        case 0:
          obj.title = reader.readString();
          break;
        case 1:
          obj.done = reader.readBool();
          break;
        case 2:
          obj.id = reader.readInt();
          break;
      }
    }
    return obj;
  }

  void write(BinaryWriter writer, Task obj) {
    writer.writeByte(3);
    writer.writeByte(0);
    writer.write(obj.title);
    writer.writeByte(1);
    writer.write(obj.done);
    writer.writeByte(2);
    writer.write(obj.id);
  }
}

[simc]

Thanks, I'll investigate that.

[simc]

I published a new version of hive_generator which should solve your problem. Please reopen the issue if it still doesn't work...

[sh0umik]

I am getting the same error

[simc]

I am getting the same error

Please open another issue with details...

[shafi49]

I am getting the same error

Please open another issue with details...

I was getting the same error while opening a box with 327 custom objects. Struggling for a while. Suddenly it disappeared with the same code. No clue what is happening here!