I added an attribute directive in my input statement ...
<div ng-repeat="contact in contacts">
<div>{{contact.type}}</div>
<div>{{contact.value}}</div>
<div><input type="radio" name="{{contact.type}}" ng-model="contact.default" ng-value="true" boolean-grid-model /></div>
</div>
And my custom directive ...
myModule.directive('booleanGridModel') {
return {
restrict: 'A',
require: 'ngModel',
link: function (scope, elem, attrs, controller) {
var radioSelected = scope.$eval(attrs.ngModel);
if(radioSelected) {
var selectedContact = scope.contact;
_.each(scope.contacts, function(contact) {
if(contact.type === selectedContact.type) {
_.isEqual(contact, selectedContact) ? contact.default = true : contact.default = false;
}
});
}
}
};
}