REST route not working

Hey,

you've got 'track' defined on the shipments collection so it would be:

track_shipments_path(order_id)

But seeing as the URL you quoted is for a shipments *member* (/orders/
333/shipments/111;track), you probably want this:

orders.resources :shipments, :member => {:track => :get}

in which case, the helper would be (as you expected)
track_shipment_path(order_id, id)

HTH,
Trevor