Retrieval by instance name does not work

[dalewking]

Consider this simple example:

void main() {
  try {
    var sl = GetIt.instance;

    sl.registerSingleton("some String", instanceName: "foo");

    final x = sl<String>("foo");
  } catch (e) {
    print(e);
  }
}

This fails with this output:

String
Invalid argument(s): Object with name foo has a different type (String) than the one that is inferred (String) where you call it

I think the problem is this code:

    if (registeredObject.registrationType is! T) {
      print(T.toString());
      throw ArgumentError(
          "Object with name $instanceName has a different type (${registeredObject.registrationType.toString()}) than the one that is inferred (${T.toString()}) where you call it");
    }

registrationType has a type of Type so this code is asking whether an instance of Type has the type String and the answer is of course no. I think you want to replace is! with !=.

[dalewking]

Alternatively you might want to go ahead and get the object from the factory then see if the object returned from the factory is T which would let you retrieve a named instance using a super class type as in:

sl.registerSingleton(someSubclassInstance, instanceName: "foo");

SuperClassType x = sl("foo");

[knaeckeKami]

Yep, this is already fixed in master, see:
#32

As a workaround until a new release is shipped, you can just replace the type parameters with <dynamic> when using named instances.

[dalewking]

@knaeckeKami Unfortunately, I think markdown syntax swallowed what you were trying to say.

[knaeckeKami]

My bad, edited.

[escamoteur]

Should be fixed with new version V3.1.0.