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.

I think you are missing `hive_generator: ^1.1.1` in the dev dependencies. — Denny Mueller, Sep 10 '21 at 13:07
That was the solution regarding the `build`. And I had to assign a typeId in the @HiveType annotation like so: `@HiveType(typeId : 1)`. Thanks a lot for the hint. — ThommyB, Sep 10 '21 at 16:10

score 9 · Answer 1 · answered Sep 10 '21 at 13:01

9

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

answered Sep 10 '21 at 13:01

Arijeet

935
5
19

1

That helped..=^ – Febin K R Jul 13 '23 at 18:18

score 5 · Answer 2 · answered Feb 25 '22 at 04:43

5

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

answered Feb 25 '22 at 04:43

Zaid Mirza

3,540
2
24
40

score 3 · Answer 3 · answered May 18 '22 at 01:58

3

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

answered May 18 '22 at 01:58

Rishal

194
5

adding ```hive_generator``` helped! – Nikita Shadkov Jul 30 '23 at 22:23

score 1 · Answer 4 · answered Aug 16 '22 at 12:27

1

try this,

flutter packages pub run build_runner watch --use-polling-watcher --delete-conflicting-outputs

answered Aug 16 '22 at 12:27

RIYAS PULLUR

13
1
4

score 1 · Answer 5 · answered Dec 16 '22 at 04:17

1

Don't forget to add hive_generator at the dev_dependencies. Here's the link https://pub.dev/packages/hive_generator

answered Dec 16 '22 at 04:17

vidalbenjoe

921
13
37

score 0 · Answer 6 · answered Feb 01 '22 at 20:27

0

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.

answered Feb 01 '22 at 20:27

haleh jahangiri

1

score 0 · Answer 7 · answered May 19 '22 at 04:30

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;
....
}

score 0 · Answer 8 · answered Nov 04 '22 at 07:55

0

 flutter packages pub run build_runner build --delete-conflicting-outputs

answered Nov 04 '22 at 07:55

MUHINDO

788
6
10

2

Remember that Stack Overflow isn't just intended to solve the immediate problem, but also to help future readers find solutions to similar problems, which requires understanding the underlying code. This is especially important for members of our community who are beginners, and not familiar with the syntax. Given that, **can you [edit] your answer to include an explanation of what you're doing** and why you believe it is the best approach? – Tyler2P Nov 05 '22 at 11:11

score -1 · Answer 9 · answered Jul 18 '23 at 19:28

I was getting the following when typing flutter packages pub run build_runner build in my console.

Deprecated. Use `dart run` instead.
Could not find package "build_runner". Did you forget to add a dependency?

This command worked for me instead: dart run build_runner build

Flutter hive: cannot generate Adapter files

9 Answers9