the following needs will reference an instance of App.LineItemsIndexController but it won’t be the same as that available in the App.LineItemsIndexRoute instance.
Unfortuately, the dot notation (line-items.index) throws a reference error, ReferenceError: <App.ValueController:ember266>#needs does not include line-items``
A slash notation (line-items/index) gives: Error: Assertion Failed: You are looking for a index controller in the Line-items namespace, but the namespace could not be found