Updating a single item in angular scope object - angularjs

Question

I am creating a like function for pictures on an Ionic app.
I can return a like count and true or false for if the request was to like or unlike a photo.
I have a function on my photos which calls a post action in my controller (the on double tap)
<div ng-repeat="update in updates" class="custom-card">
<div ng-show="{{update.image}}" class="image">
<img on-double-tap="likeUpdate({{update.data.id}})" class="full-image" ng-src="https://s3-eu-west-1.amazonaws.com/buildsanctuary/images/{{update.image.name}}" imageonload>
</div>
<div class="action-bar">
<div class="left">
<i ng-class="liked ? 'ion-ios-heart red' : 'ion-ios-heart-outline'"></i><span>like</span>
</div>
</div>
If this was a single update shown, I would simple update the 'update' scope and it would work. But I have a list of photo's shown and the user can double tap on anyone. What I need is to be able to update the scope of updates but only for a single update and not the whole lot.
My function in controller:
$scope.likeUpdate = function(update_id) {
console.log("clicked");
$http.post( $rootScope.apiURL + 'likeupdate', {
update_id : update_id,
user_id : $rootScope.currentUser.id
}).success(function(update, response){
// update the specific ng repeat item scope?
});
}
Is there an angular way for this?

Answer 1

Don't pass the id, pass the whole update into your handler so you can change it inside, something like this:
<img on-double-tap="likeUpdate({{update}})" ... >
And controller:
$scope.likeUpdate = function(update) {
console.log("clicked");
$http.post( $rootScope.apiURL + 'likeupdate', {
update_id : update.data.id,
user_id : $rootScope.currentUser.id
}).success(function(result, response){
update.xxx = ...
});
}
A simple runnable example:
angular.module('myApp', [])
.controller('MyController', ['$scope', function($scope) {
$scope.updates = [{'name':'one', count: 2}, {'name':'two', count:3}];
$scope.likeUpdate = function(update) {
// this doesn't work:
update = {'name': 'test', count: update.count+1};
// this works:
update.name = 'test';
update.count += 1;
};
}]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="myApp" ng-controller="MyController">
<div ng-repeat="update in updates" class="custom-card">
<div ng-click="likeUpdate(update)">{{update.name}} - {{update.count}}</div>
</div>
</div>