Retrieve data from non-default REST API

I would like to query my server for this URL http://localhost:1337/api/posts/count?category=technology using Ember. I'm using the default RESTAdapter like this:

export default DS.RESTAdapter.extend({
  coalesceFindRequests: true,
  namespace: 'api',
)};

The Post model looks like this:

import DS from 'ember-data';

var Post = DS.Model.extend({
  title: DS.attr('string'),
  permalink: DS.attr('string'),
  body: DS.attr('string')
});

export default Post;

How do I make such a request?