How to get the current ODataModel of my app

Hi experts, i just want to get() my current (excisting) ODataModel in a barcode function in a controller.

Its a hybrid kapsel app (extension).

I tried in many ways but it doesn't work. For example: var myModel = this.oApplicationFacade.getODataModel();
or this.getODataModel();

Any ideas?

Thanks in advance,
Konstantinos Vogiatzakis