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ng-model not working for dynamic key of object and ng-repeat not working

i am building a project where we have one url input tag, which have its respective url mappings which needs to accept only URL and a add button to repeat two input tags from below scenerio: url1 have urla -> urlb, urlc->urld, urle->urlf,....it has add button add as many as mappings. On save we need to send this json format to post API.

required json format : { url1: { urla : urlb, urlc : urld, urle : urlf,... }, url2:{ urlg : urlh, urli: url,..... },...... }

ISSUE : i m unable to get the required json format from my code. ` HTML

<div>
<input id="url" type="text" ng-model="">
      </div>
<div id="maprow1" class="row mt-5" ng-repeat="(privateUrl, publicUrl) in urlMappings track by $index">
<input id="privateurl1" type="text" class="form-control input-text http-input"  ng-model="urlMappings.privateUrl">
<input id="publicurl1" type="text" class="form-control input-text http-input"  ng-model="urlMappings.publicUrl">
<div id="mappingmain1" class="col-md-1 pr-0 text-right">
          <button id="btnaddmapping1" class="button-default button-m panel-heading-margin" type="button" ng-click="addUrlMapping();" ng-if="$last">
            <i class="di-block icon-add icon20 mr-0 v-sub"></i>
          </button>
<button class="button-default button-m panel-heading-margin" type="button" ng-if="!$last" ng-click="slideUpModal();">
            <i class="icon16 icon-delete v-sub di-block mr-0"></i>
            </button>
<div id="addview" class=" pull-right p-20" ng-show="!displayModal">
     <span class="button-cancel" data-dismiss="modal">Cancel</span>
      <button id="addmapping" class="button-m button-primary" type="button" ng-click="addDomain();">Save</button>
    </div>
  </div>
controller:
 $scope.urlMappings = [];
 $scope.addUrlMapping = function() {
            {
        $scope.domainUrl ='';
        $scope.privateUrl = '';
        $scope.publicUrl = '';
        const privateUrl = $scope.privateUrl;
        const domainUrl = $scope.domainUrl;
        var newUrlMappingField = {
             [privateUrl]: $scope.publicUrl
        };
         $scope.urlMappings = {
         [domainUrl] : newUrlMappingField
         }   };
        `
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