问Ember计算属性控制器

EN

App.Category = DS.Model.extend({
    translation_ids: DS.hasMany('translation', { embedded: 'always' }),
});

App.Translation = DS.Model.extend({
    name: DS.attr(),
    locale: DS.attr()
});

App.CategoryController = Ember.ObjectController.extend({   
    needs: ['settings'],
    currentLocale: Ember.computed.alias('controllers.settings.currentLocale'),
    name: function() {
        var translations = this.get('translation_ids').filterBy('locale', this.get('currentLocale'));
        Ember.assert("Only one translation is expected", translations.length === 1);
        return translations[0].get('name');
    }.property('translation_ids') 
});