Ghost/core/client/app/models/slug-generator.js

import Ember from 'ember';
import {request as ajax} from 'ic-ajax';

export default Ember.Object.extend({
    slugType: null,
    value: null,

    ghostPaths: Ember.inject.service('ghost-paths'),

    toString: function () {
        return this.get('value');
    },

    generateSlug: function (textToSlugify) {
        var self = this,
            url;

        if (!textToSlugify) {
            return Ember.RSVP.resolve('');
        }

        url = this.get('ghostPaths.url').api('slugs', this.get('slugType'), encodeURIComponent(textToSlugify));

        return ajax(url, {
            type: 'GET'
        }).then(function (response) {
            var slug = response.slugs[0].slug;

            self.set('value', slug);

            return slug;
        });
    }
});