users.js

import Ember from 'ember';

export default Ember.Route.extend({
  currentUser: Ember.inject.service(),

  model(params){
    const username = params.username;

    return Ember.RSVP.hash({
      user: this.store.query('user', {filter: {username: username}}),
      isCurrentUser: new Promise((resolve) => {
        this.get('currentUser').getUser().then((user) => {
          resolve(user.get('username') === username);
        });
      })
    });
  }
});