Using transitionToRoute with a model with a custom slug - ember.js

Question

I've got an ember-data model that has an id as well as a server-generated custom slug attribute (which is prefixed with the id if that matters).
I'd like to use the slug instead of the id in all public routres. For that purpose, I have changed the router:
App.Router.map ->
#resource 'strategies', path: '/strategies', ->
#resource 'strategy', path: ':strategy_slug'
and overwrote the serialize method of the respective route:
App.StrategyRoute = Ember.Route.extend()
serialize: (model) ->
{
strategy_slug: model.get('slug')
}
Unfortunately, this does not seem to work when using transitionToRoute from a controller to transition to, e.g., /strategies/123-test:
App.ExampleController = Ember.ObjectController.extend()
[...]
actions:
showDetails: ->
#transitionToRoute("/strategies/#{#get('slug')}")
false
(where #get('slug') returns '123-test')
All output I get in the console after invoking the showDetails action is:
Transitioned into 'strategies.index'
Ember does seem to recognize the slug-based route.
Ember: 1.5.0-beta.2+pre.3ce8f9ac
Ember Data: 1.0.0-beta.6
Is there anything I may have missed?
Edit:
The following variant works and is feasible in this case, but I have another use-case where I have only access to the URL.
App.ExampleController = Ember.ObjectController.extend()
[...]
actions:
showDetails: ->
#transitionToRoute('strategy', #get('content'))
false

Answer 1

I eventually figured out how to solve this. The key is to add a model method to the router, which knows how to turn a slug into a model:
App.StrategyRoute = Ember.Route.extend()
model: (params, transition) ->
App.store.getById('strategy', parseInt(params.strategy_slug))
serialize: (model) ->
{
strategy_slug: model.get('slug')
}