Get_It Flutter Multiple Abstract Class Registration

user_11125112 0
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We are using the package get_it:^7.1.3 for dependency injection. I want to register some classes with the same abstract class (like they were interfaces) and get them like:

List<AbstractLass> allClassesWhichImplementAbstractClass=di.sl.get<AbstractLass>();

Therefore I'd like to register it the following way:

  sl.registerLazySingleton<AbstractLass>(() =>
  AbstractLassImpl1());
  sl.registerLazySingleton<AbstractLass>(() =>
  AbstractLassImpl2());

But as I do that, I'll get an exception :

ArgumentError (Invalid argument(s): Object/factory with  type AbstractLass is already registered inside GetIt. )

There is another solution where I register just the implementation the following way:

  sl.registerLazySingleton<AbstractLassImpl1>(() =>
  AbstractLassImpl1());
  sl.registerLazySingleton<AbstractLassImpl2>(() =>
  AbstractLassImpl2());

which works but then I would not access both by using their abstract class (if that is possible)

Can someone help me?

flutter dependency-injection
2 Answers

You can do it by providing instanceName parameter like so:

sl.registerLazySingleton<AbstractClass>(() =>
  AbstractClassImpl1(), instanceName: 'implementation1');
sl.registerLazySingleton<AbstractClass>(() =>
  AbstractClassImpl2(), instanceName: 'implementation2');

And use it also with the same name included:

sl.get<AbstractClass>(instanceName: 'implementation1');
user_20871650

You can only register one object using registerLazySingleton() due to its Singleton behaviour.

If you want to register multiple interfaces with different implementation, try using registerFactory(), etc.

user_104825160
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