How to add a new record and not update previous record in angularjs - angularjs

Question

How do I add a new record and have angular "forget" the new item added after I click the corresponding button.
The ability to add a record works and when I add the new record it display in the table I have, correctly, However my problem is that when I go to add a second record ie I remove the previous input and type something else. This results in the newly added record below to also change.
In short after I add an item to my array I want angular to forget it. How do I accomplish this.
In my controller I have this
(function () {
var app = angular.module("mainApp");
var ordersController = function ($scope,$filter, ordersService,customerService) {
$scope.orders = [];
$scope.addOrder = function (newOrder) {
$scope.orders.push(newOrder);
}
app.controller("ordersController", ["$scope","$filter", "ordersService","customerService", ordersController]);
}());
in my html I have this
<div><table>
<tr>
<td><input ng-model="item.quantity" type="text" /></td>
<td><button type="button" ng-click="addOrder(item)">Add Line Item</button></td>
</tr>
</table></div>
<div>
<table>
<tr ng-repeat="order in orders track by $index">
<td>
{{ order.quantity }}
</td>
</tr>
</table>
</div>

Answer 1

The problem might be that you are adding the newOrder object to the array while Angular keeps it's model bound to that object. Try using Angular's copy functionality like this (assuming that you are using Angular 1):
$scope.addOrder = function (newOrder) {
var copiedOrder = angular.copy(newOrder);
$scope.orders.push(copiedOrder);
}
The documentation for the copy method can be found here.