Finding a model in ember.js - ember.js

Question

I'm completely new to ember js. I've downloaded the last rc 2 version of ember, ember-data.js 12 revision, and looked at the manual and copy-past this code in order to be able to see the GET request to my server:
App = Ember.Application.create();
App.Router.map(function() {
... some resources...
});
App.Store = DS.Store.extend({
revision: 12 // Default is the REST Adapter
});
App.Person = DS.Model.extend({
firstName: DS.attr('string'),
lastName: DS.attr('string'),
birthday: DS.attr('date'),
fullName: function() {
return this.get('firstName') + ' ' + this.get('lastName');
}.property('firstName', 'lastName')
});
var person = App.Person.find(1);
And I get the next error:
Uncaught Error: assertion failed: Your application does not have a
'Store' property defined. Attempts to call 'find' on model classes
will fail. Please provide one as with 'YourAppName.Store =
DS.Store.extend()'
But as I understand I defined the Store property. Maybe I missed something because I havent read the whole manual, but honestly I can't see what's wrong. As I get it after this code I'll see get /post/1/ request to my server, and it should be an amazing thing, but I'm still struggling with this error

Answer 1

This is happening because ember applications are initialized asynchronously. In general you just define classes when js is being loaded, executable code belongs in hooks/callbacks. Mostly you will be using model find() from the model hook on your routes, but if you really need to do something like this right away you can do this:
App.then(function() {
console.log('App has been initialized...');
var person = App.Person.find(1);
});
If you want to experiment with this approach try this jsfiddle which demonstrates using App.then() with the ember-data fixture adapter based on the getting started screencast