How to read body parameters from Ember patch request

My Ember logic for updating book

this.store.findRecord('book', 13).then(function (book) {

           book.set('status', 'new');
           book.set('author', 'Someone');
           book.set('rating', '5');
           book.save();

}

My question is, how can I read book.status,book.author& book.rating from server side? I am only getting id i.e 13. Please help me out.