How to use registerFactory ?

[jackyhieu1211-hn]

Hello

I have 2 class

abstract class UserRepository {
  Future<User> getUser;
}

class UserRepositoryImpl implements UserRepository {
  @override
  Future<User> getUser() {
   // ..... logic
  }
}

I use like below

sl.registerFactory<UserRepository>(
     () => UserSummaryRepositoryImpl());

on main.dart

UserRepository _userRepository = sl.get(); 
_userRepository.getUser();

And get error below

No type UserRepositoryImpl is registered inside GetIt.
 Did you forget to pass an instance name? 
(Did you accidentally do  GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;did you forget to register it?)
'package:get_it/get_it_impl.dart':
Failed assertion: line 251 pos 14: 'instanceFactory != null'

NOTE: If I use the following then it works. But it is not clear.

    sl.registerSingleton(UserRepositoryImpl());
    sl.registerFactory<UserRepository>(
            () => sl.get<UserRepositoryImpl>());

Please help me solve the above case. thank you very much

[escamoteur]

From the code above this seems a bit strange to me. I always recomment passing the Generic type when you use get.
you can then write sl<MyType>() and omit the get.

What I don't understand is this here:

sl.registerFactory<UserRepository>(
     () => UserSummaryRepositoryImpl());

where you use a complete different Implementation than the one in your error Message.
Please create a small repro project on GitHub, so that I can have a closer look

[jackyhieu1211-hn]

@escamoteur hello sir
I created a sample project
Please check here.
https://github.com/hieuseesaa/test_floor

• Please help me fix with How to use with floor library? #99
  Thank you very much

[escamoteur]

you mixed up async registration and sync call of get

your function must look like

  static _registerDatabase() async {
    AppDatabase database =
        await $FloorAppDatabase.databaseBuilder('test.db').build();
    sl.registerLazySingleton(() => database.userDao);
  }

[jackyhieu1211-hn]

@escamoteur thank you. It worked.

Can you help me with this question?

I'm android developer. I used https://github.com/InsertKoinIO/koin to inject function.
for classes UserRepository and UserRepositoryImpl. I just used the following

factory<UserRepository> {
    UserRepositoryImpl()
}

But for get_it. I need to do the following

sl.registerSingleton(UserRepositoryImpl());
sl.registerFactory(() => sl.get());

=====> So for get_it. Is there a way to do the same as koin ?. Please help me. Thank you very much.

[escamoteur]

What are you trying to do there?
´´´
sl.registerSingleton(UserRepositoryImpl());
sl.registerFactory(() => sl.get());
´´´
I would just do:

sl.registerSingleton<UserRepository>(UserRepositoryImpl());

[jackyhieu1211-hn]

@escamoteur Thank you very much. It worked.

[jackyhieu1211-hn]

@escamoteur
Hello sir. I have a problem.
This is project example
https://github.com/hieuseesaa/test_floor

When I add UserDao inside UserRepositoryImpl. It show error.

I use like below

class UserRepositoryImpl implements UserRepository {
  UserManager manager;
  UserDAO userDAO;

  UserRepositoryImpl(this.manager, this.userDAO);

  @override
  User getUser() {
    manager.test();
    final id = Random.secure().nextInt(1000);
    print("ID ====> $id");
    return User("$id", "Google");
  }

  @override
  void insert(User user) async {
    userDAO.insertUser(user.toUserEntity());
  }
}

abstract class UserRepository {
  User getUser();
  void insert();
}

GetIt sl = GetIt.instance;

class ServiceLocator {
  static Future<void> initCommon() async {
    sl.registerSingleton(UserManager());
    await _registerDatabase();
  }


  static _registerDatabase() async {
    AppDatabase database =
        await $FloorAppDatabase.databaseBuilder('test.db').build();
    sl.registerLazySingleton(() => database.userDao);
    sl.registerSingleton<UserRepository>(UserRepositoryImpl(sl.get(), sl.get<UserDAO>()));
  }
}

This is error

The following assertion was thrown building Builder:
No type UserRepository is registered inside GetIt.
 Did you forget to pass an instance name? 
(Did you accidentally do  GetIt sl=GetIt.instance(); instead of GetIt sl=GetIt.instance;
did you forget to register it?)
'package:get_it/get_it_impl.dart':
Failed assertion: line 257 pos 14: 'instanceFactory != null'

Please help me. thank you very much.

[escamoteur]

You never registered a type `UserRepository´ in your code. You only registered a derived class. If you would always use the generic types that would not happen to you.

Instead of

sl.registerSingleton(UserManager());

you have to do

sl.registerSingleton<UserRepository>(UserManager());