[pyre]

I have a large, complex Ember.js + Ember-Data + Flask API app, and I don't think that I use `needs` anywhere in the codebase, so I don't think it's absolutely necessary. IIRC, the documentation says that `needs` only applies to singleton controllers. If you have a controller associated with a model (vs. a view + controller + route combo), I would assume that it's not a singleton (i.e. controllers associated with a view are singletons in that Controller.init() is only called once, even when switching away and back to a view).

[baddox]

To use my example of an app with URLs like "/tv_shows/555/seasons/3/episodes/2", if you're in the episodes/index controller (or template or view), how do you reference the particular season and tv_show that episode is part of?