AngularJS - How to call controller function with item value as argument in ng-repeater?

I am quite new to AngularJS, and I am stuck for a moment using the ng-repreat.

I am trying to call a controller function using ng-click to change the model. First, I used the $index variable provided by ng-repeat. But when I added a filter, I could not get the correct item ID. (removing the filter restore the expected behavior)

I made a simple example : http://jsfiddle.net/folkenda/wt7b2/ As indicated in the script I would like to using friend.id instead of $index in order to set the correct value in my friendvariable.