json - angularjs checkbox append to scope variable -

i have table follows:

    <tr ng-repeat="user in users">         <td>{{user.fields.first_name}}, {{ user.fields.last_name }}</td>         <td>             <input type="checkbox">         </td>     </tr> 

and json follows:

{     "users":      [         { "fields": {"first_name": "sam", "last_name": "smith"}, "model": "auth.user", "pk": 3},          { "fields": {"first_name": "tom", "last_name": "moody"}, "model": "auth.user", "pk": 4}     ] } 

i want have functionality add pk's of selected checkboxes scope variable. since don't have boolean field selected in json, how approach this?

or can try ng-change, bit more elegant imo:

var app = angular.module('app', []);    app.controller('acontroller', function($scope) {       $scope.users = [      { "fields": {"first_name": "wasif", "last_name": "abbas"}, "model": "auth.user", "pk": 3},       { "fields": {"first_name": "asad", "last_name": "zaman"}, "model": "auth.user", "pk": 4}  ];    $scope.selectedusers = {};    $scope.adduser = function(pk, userselected) {      if(userselected) {          $scope.selectedusers[pk] = true;      } else {          delete $scope.selectedusers[pk];      }  }    $scope.getselectedusersarray = function() {      return object.keys($scope.selectedusers);  }  });

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>  <div ng-app="app">  <div ng-controller="acontroller">      <table>           <tr ng-repeat="user in users">              <td>{{user.fields.first_name}}, {{ user.fields.last_name }}</td>              <td>                  <input type="checkbox" ng-model="userselected" ng-change="adduser(user.pk, userselected)"/>              </td>          </tr>      </table>      <div>selected: {{getselectedusersarray()}}</div>  </div>  </div>