Ember.js - Improving Error.Route with more explicit error code handling

404.handlebars

<h2>404</h2>
Sorry bra ,we couldn't find that.

app.js

var App = Ember.Application.create();

/** App.Error
 * 
 * Extend the JavaScript Error object to have a code
 * which we can pass around the app.
 * 
 * @param {string} message A message describing the error 
 * @param {integer} code A generic code describing the error
 */
App.Error = function(message, code) {
    this.name = 'Error';
    this.message = message;
    this.code = code;
    this.stack = (new Error()).stack;
}
App.Error.prototype = new Error;

error.handlebars

Generic / default error template

error_route.js

App.ErrorRoute = Ember.Route.extend({
    'renderTemplate' : function() {
        switch (this.get('controller.content.code')) {
            case 404 : return this.render('404');
            default : return this.render();
        }
    }
});

translation_model.js

App.Translation.reopenClass({
	
	'findOne' : function(data) {
		
		var d = new Ember.Deferred();
		
		Ember.$.ajax({
			'url' : '/api/v1/translation/',
			'context' : this,
			'dataType' : 'json',
			'data' : data
		})
		.done(function(data) {
			try {
				if ( ! data.objects[0])
				    throw new App.Error("Unable to find translation", 404);
					
				d.resolve(App.Translation.create(data.objects[0]));
			}
			catch (error) {
				d.reject(error);
			}
		})
		.fail(function(data) {
			d.reject();
		});
		
		return d;
	}

});

translation_route.js

App.TranslationRoute = Ember.Route.extend({
    'model' : function(params) {
        return App.Translation.findOne({ 'hash' : params.translation_hash });
    },
    'serialize' : function(model) {
        "use strict";
        return {
            'translation_hash' : model.get('hash'),
        };
    }
});