ng-selected not working with ng-repeat angularjs

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ng-selected not working with ng-repeat,in inspect element i can see ng-selected= true and there is selected attribute on option element.my code is as follows and output screenshot is also given below.

<div class="row">
     <div class="col-xs-2 col-sm-2 col-md-2 col-lg-2">
         <label for="">{{diamond.category_id}}</label>
     </div>
     <div class="col-xs-10 col-sm-10 col-md-10 col-lg-10">
         <select ng-model="diamond.category_id" class="form-control">
                 <option  ng-selected="{{diamond.category_id == category.id}}" 
                          value="{{category.id}}"
                          ng-repeat="category in categoryData"
                 >{{category.id}}</option>
          </select>
     </div>

Output Link : http://prntscr.com/bfcdwa

Your code should be like this:

<select class="form-control" ng-options="item.id for item in categoryData track by item" 
 ng-model="diamond.category_id">
</select>

from: https://stackoverflow.com/questions/37771631/ng-selected-not-working-with-ng-repeat-angularjs/37771794#37771794

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