Ghost/ghost/admin/app/services/session.js

import Ember from 'ember';
import SessionService from 'ember-simple-auth/services/session';

const {
    computed,
    inject: {service}
} = Ember;

export default SessionService.extend({
    store: service(),
    feature: service(),

    user: computed(function () {
        return this.get('store').findRecord('user', 'me');
    }),

    authenticate() {
        return this._super(...arguments).then((authResult) => {
            return this.get('feature').fetch().then(() => {
                return authResult;
            });
        });
    }
});