javascript - Angular ui multiselect binding only desired property -

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i'm using angularjs ui select , want select more 1 items.my code this

$scope.user.selectedcategories $scope.categories= [ { value: 'reading', name: 'reading books',id : 4 }, { value: 'sports', name: 'physical activity',id : 9 }, { value: 'movies', name: 'entertainment',id : 7 }, { value: 'video games', name: 'passion',id : 11 } ];  <div class="input-group">             <ui-select multiple ng-model="user.selectedcategories" theme="bootstrap" sortable="true" close-on-select="false" style="width: 350px;">                 <ui-select-match placeholder="select categories...">{{$item.value}}</ui-select-match>                 <ui-select-choices repeat="category in categories">                     {{category.value}}                 </ui-select-choices>         </div>

right selectedcategories contain whole object selected want select id property of selected object. desired result

selectedcategories = [4,9,11]

but

selectedcategories = [{value:'reading,name:'reading book',id:4}, {value:'movies',name:'entertainment',id:7}]

use like

<ui-select-choices repeat="category.id category in categories">{{category.value}} </ui-select-choices>

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