Ember.js route problems with filter

My aim is to pass filtered data to my controller and then to my template. I've tried not using the filter and everything works as expected. If I even try to use a filter that lets everything through, I don't get any data. I've even tried using false instead of true and fiddling with the argument list of the filter.

I'm using ember-data fixtures to test this. I'm following the name conventions so much of the work is done for me under the hood. That all seems to be working though (otherwise the first example should also have a problem).

Works (arrives in the controller and eventually gets rendered on the page):

App.DomainDirRoute = Ember.Route.extend({
  model: function(params) {
    return this.store.find('domain_dir');
  }
});

Fails (controller gets an empty array):

App.DomainDirRoute = Ember.Route.extend({
  model: function(params) {
    return this.store.filter('domain_dir', function(item){
        return true;
    });
  }
});