I have two models: Book belongsTo Author. Let\'s survey the author data sent together with book data on its way from server to ExtJs and back. Server sends following nested
Short Answer: No, not yet.
Longer answer: You could create your own writer to handle your data structure and send it back to the server the same way as you received it.
You could either create your own writer by subclassing: http://docs.sencha.com/ext-js/4-2/#!/api/Ext.data.writer.Writer and use that in your proxy
or
You could create a function on your model that changes it's structure. Since you are not using stores you could create a function saveModel() where you change the model structure and call the save() method.