Using transitionToRoute, passing a route without a dynamic segment the current model causes error

I have a route defined in the Router as:

...
this.resource('cart', {path: 'my/cart'});
...

MyApp.CartRoute = Ember.Route.extend({
    model: function(params) {
        return this.store.find('cart');
    }
});

In my CartController (ArrayController) I have this line of code in an action (addToCart):

this.transitionToRoute('cart', this.get('model'));

In some other route's template, I call that action:

<button {{action 'addToCart' product target='controllers.cart'}}>Add To Cart</button>

When that button is clicked, I get this error:

Uncaught Error: More context objects were passed than there are dynamic segments for the route: cart

To my understanding, Ember should have recognized that I was passing it a model and skipped the model hook, which is what I want.

This can be fixed by adding a random, useless dynamic segment to my route definition then defining serialize in my CartRoute. However, if there is a better way, I would rather do that.

Am I going about this the wrong way?