Ember.js: Transition somewhere else if a model exists

I want to implement logic that goes something like this:

If an value exists in storage, redirect here, else redirect there.

I'm doing it something like this:

App.IndexRoute = Ember.Route.extend({
    beforeModel: function () {
      var context = this;
      this.store.find("thing").then(function (things) {
        var thing = things.get("firstObject");
        if(thing) {
          context.transitionTo("some.where");
        } else {
          context.transitionTo("somewhere.else");
        }
      });
    }
});

I have a feeling I am not doing it right. What is the best way to do this?

Thanks