App.Person = DS.Model return NULL when finished loading.

models.js

App.Person = DS.Model.extend({
  firstName: DS.attr('string'),
	lastName: DS.attr('string'),

	fullName: function() {
		return this.get('firstName') + ' Test ' + this.get('lastName');
	}.property('firstName', 'lastName'),

	didLoad: function() {
		console.log(this.get('firstName') + this.get('lastName') +" finished loading.");
	},
	isError: function() {
		console.log('Error');
	}
});

stores.js

App.store = DS.Store.create({
  revision: 10,
	adapter: DS.RESTAdapter.create({ bulkCommit: false, namespace: 'rest' })
});

App.store.load(App.Person, {
	id: 1,
	firstName: "Peter",
	lastName: "Wagenet"
});

App.store.loadMany(App.Person, [{
    id: 2,
    firstName: "Erik",
    lastName: "Brynjolsofosonsosnson"
},

{
    id: 3,
    firstName: "Yehuda",
    lastName: "Katz"
}]);