ng-repeat store separate values - angularjs

Question

I want to store the users vote's inside a cookie, the problem is that inside the ng-repeat I have a value called session.upVoteCount. But it is supposed to be a separate value for each event list item. Is it possible to store each upVoteCount separately and then retrieve them separately again?
<li ng-repeat="session in event.sessions | filter:query | orderBy:sortorder" class="span11">
<div class="row session">
<div class="col-sm-1 well votingWidget">
<div class="votingButton" ng-click="upVoteSession(session)">
<span class="glyphicon glyphicon-arrow-up"></span>
</div>
<div class="badge badge-inverse">
<div>{{session.upVoteCount}}</div>
</div>
<div class="votingButton" ng-click="downVoteSession(session)">
<span class="glyphicon glyphicon-arrow-down"></span>
</div>
</div>
</div>
</li>
and in my controller I have this:
$scope.upVoteSession = function(session) {
session.upVoteCount++;
};
$scope.downVoteSession = function(session) {
session.upVoteCount--;
};

Answer 1

First, I don't recommend to use term 'session', but 'votes'. However, it's your call.
I simplify your problem in this example
http://plnkr.co/edit/l7tQRbuOtEDJetY5eTsf?p=preview
Javascript:
function MyCtrl($scope) {
$scope.votes = {};
$scope.vote = function(key, val) {
$scope.votes[key] = $scope.votes[key] || 0;
$scope.votes[key]+= val;
};
}
Html:
<li ng-repeat="no in [1,2,3,4,5]">
{{no}} : {{votes[no]}} <br/>
upvote
downvote
</li>

Answer 2

Hi guys I solved it myself, I could not get it to work with JSfiddle so I have uploaded the entire thing. Click on server.bat and browser to localhost:8000/eventdetails.html and you will see it working.
https://mega.co.nz/#!1d9yiYiA!zTzdztLAmhVDVYOvvVLINETI2bo_WjxCBteWYm2VUKc
controller:
eventsApp.controller('EventController',
function EventController($scope, $cookieStore, eventData) {
$scope.sortorder = 'name';
var ape = eventData.getEvent();
ape.then(function (banana) {
$scope.event = banana;
angular.forEach(banana.sessions, function (value, key) {
var storecookie = ($cookieStore.get(value.name));
if (typeof storecookie !== "undefined") {
value.upVoteCount = storecookie;
}
});
});
$scope.upVoteSession = function (session) {
session.upVoteCount++;
$cookieStore.put(session.name, session.upVoteCount);
};
$scope.downVoteSession = function (session) {
session.upVoteCount--;
$cookieStore.put(session.name, session.upVoteCount);
};
}
);