AngularJS update model on server with ng-change

AngularJS update model on server with ng-change

I am trying to figure out a way to submit to my restful webservice my
updated models as the values are edited. Using a directive such as
ng-change or ng-nlur, it will considerably increases the number of
requests to the server. I don't want to submit information in the same way
that a form would. My server application uses Symfony2 framework.
What would be the optimal way to achieve this?