Return count of total rows in ember data `find` or `findAll` request

I need to know how many rows of a specific resource (App.User) exist in total.

I tried to return it in response, but Ember complains about not mapped properties and is expecting only array of records (users: [ "john", "fred"]). I do not want to make an additional query to the server.

Is there any clean way to achieve this with Ember?