Flutter hive: cannot generate Adapter files

Question

I have a model like so:

import 'package:uuid/uuid.dart';
import 'package:hive/hive.dart';

part 'config_item.g.dart';

@HiveType()
class ConfigItem {
  @HiveField(0)
  String _id; // this can be a uuid or a MongoDB ObjectID
  @HiveField(1)
  final String deviceName;
....
}

I like to generate the Adapter file but it does not want to do it! When I call flutter packages pub run build_runner build --delete-conflicting-outputs I get the following output:

flutter packages pub run build_runner build  --delete-conflicting-outputs                main  ✭ ✈
[INFO] Generating build script...
[INFO] Generating build script completed, took 399ms

[SEVERE] Nothing can be built, yet a build was requested.
[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 45ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 399ms

[INFO] Running build...
[INFO] Running build completed, took 3ms

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 35ms

[INFO] Succeeded after 53ms with 0 outputs (0 actions)

In my pubspec.yaml I have:

environment:
  sdk: ">=2.12.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter


  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  bottom_navy_bar: ^6.0.0
  get_it: ^7.2.0
  get_it_mixin: ^3.1.3
  servicestack: ^2.0.0
  font_awesome_flutter: ^9.1.0
  hive: ^2.0.4
  hive_flutter: ^1.1.0
  path_provider: ^2.0.3
  uuid: ^3.0.4

dev_dependencies:
  flutter_test:
    sdk: flutter
  build_runner:

I tried all sort of things like

• Delete .dart_tool folder
• Adding *.g.dart to .gitignore
• flutter clean
• and a lot more I found when searching the net.

But nothing helps! Any idea what is missing?

I am using the latest (stable) versions of flutter, dart SDK and AndroidStudio.

Answer 1

Run this command :

flutter packages pub run build_runner build

But before that, you will have to import the generator.

Example : If your file name is project_database.dart, then in that file :

Import,

import 'package:hive/hive.dart';
part 'project_database.g.dart'; //this will show an error initially but if
 // you run the above command, it will generate the generator file

Answer 2

i had same problem. i solved by saving my changes in pubspec.yaml. just press ctrl + s in pubspec.yaml then run flutter packages pub run build_runner build again.

Answer 3

I faced the same issue but I was missing hive_generator: ^1.1.1. I didn't find it in the original Docs.

Special thanks to @Denny Mueller's comment

Answer 4

pub run build_runner build 

after got the part .save it and the error will gone

Also add hive_generator in ur dev_dependecies.

hive_generator package can automatically generate TypeAdapters for almost any class.

If you have any other problem refer here

Answer 5

Give TypeId for @HiveType.

In your Case :

import 'package:uuid/uuid.dart';
import 'package:hive/hive.dart';

part 'config_item.g.dart';

@HiveType(typeId: 0)
class ConfigItem {
  @HiveField(0)
  String _id; // this can be a uuid or a MongoDB ObjectID
  @HiveField(1)
  final String deviceName;
....
}