Model binding dynamic collections. IV DeleteController

gistfile1.cs

[HttpPost]
public override ActionResult Index(string save, string discard, DeleteViewModel posted)
{
    if (isSave(save, discard))
	{
		_repository.Save(DeletableThing.ToThings(posted.Things));
	}
	IEnumerable<Thing> updatedThings = _repository.Find();
	var model = new DeleteViewModel
	{
		Things = DeletableThing.FromThings(updatedThings)
	};
	return View(model);
}