How to do decorator with composition pattern in Autofac and Ninject - ninject

Question

I want to make a 'decorator' for the IRepository. This decorator is also a 'composition' of multiple IRepository's. In code:
public interface IRepository { }
public class RepositoryFoo : IRepository { }
public class RepositoryBar : IRepository { }
public class RepositoryDuh : IRepository { }
public class RepositoryComposition : IRepository
{
public RepositoryComposition(IRepository master, IEnumerable<IRepository> slaves) { }
}
The RepositoryComposition will in some cases call both master and slaves and in some cases only the master.
I have made this setup work with both Autofac and Ninject, but I think the Ninject solution is not so good. So the question is, can this be done better? And how?
Here is my Autofac solution:
ContainerBuilder builder = new ContainerBuilder();
builder.RegisterType<RepositoryFoo>().Named<IRepository>("master");
builder.RegisterType<RepositoryBar>().Named<IRepository>("slave");
builder.RegisterType<RepositoryDuh>().Named<IRepository>("slave");
builder.Register<IRepository>(f => new RepositoryComposition(
f.ResolveNamed<IRepository>("master"),
f.ResolveNamed<IEnumerable<IRepository>>("slave"))
);
Here is my Ninject solution:
Bind<RepositoryFoo>().ToSelf();
Bind<RepositoryBar>().ToSelf();
Bind<RepositoryDuh>().ToSelf();
Bind<IRepository>().To<RepositoryComposition>().
WithConstructorArgument("somethings", f => f.Kernel.Get<RepositoryFoo>()).
WithConstructorArgument("slaves", f => new IRepository[] {
f.Kernel.Get<RepositoryBar>(),
f.Kernel.Get<RepositoryDuh>()
});
I both cases I will resolve in the IRepository interface.

Answer 1

This is not an answer but is useful to know given the question: the registration is simple with Simple Injector
container.Register<IRepository, RepositoryFoo>();
container.RegisterAll<IRepository>(typeof(RepositoryBar), typeof(RepositoryDuh));
container.RegisterDecorator(
typeof(IRepository),
typeof(RepositoryComposition),
context => context.ImplementationType == typeof(RepositoryFoo));