“track by $index” creating duplicates on save using ng-repeat

Question

I'm having a problem when I update my object, it's creating a duplicate of this instance (singleOrder) in the model, instead of updating the exisiting one. I can't clear the whole $scope and reload, as I'm only updating part of the object.

Here's my save function:

$scope.saveDetails = function(singleOrder, data, status) {              

    OrdersService.updateOrders(singleOrder.order)

    .success(function(data, status) {
        angular.extend(singleOrder, data);                      
    })                             
}

Where singleOrder relates to an instance of my main OrderDetails object, used in ng-repeat

<div ng-repeat="singleOrder in orderDetails track by $index">

Here's the function called in my OrdersService, if that helps:

getData.updateOrders = function(data){
    var url = '/service/rest/orders';

    return $http.post(url, data)                    
};

Thanks for any help you can offer.

UPDATE: I've tried messing around with the track by and received the following results:

<div ng-repeat="singleOrder in orderDetails track by $index"> Saves the content fine, but creates a duplicate order on dom.

<div ng-repeat="singleOrder in orderDetails track by singleOrder.order.id"> This works as each order has a unique id. I can save fine and it doesn't create a duplicate in the dom, but I get a Duplicates in a repeater are not allowed in the console.

Confused as to why this is happening. Any ideas welcome!

Answer 1

angular.extend() returns the destination object, so maybe you could do something like this

OrdersService.updateOrders(singleOrder.order)
.success(function(data, status) {
    singleOrder = angular.extend(singleOrder, data);                      
})

But in my opinion it is better when server returns the whole object that the client needs. The code will be easier.

Answer 2

Just to follow up on this, it appears the issue wasn't with Angular, it was the data in the object. I can't say exactly what part was the problem, but after the content was updated, this started working with track by $index .

Thanks everyone for trying to help!