javascript - Angular Dropdown list with two different data -

my apologies, newbie using angular, question following. have dropdownlist , display 2 different sets data on dropdown. first make call way api single value, going default 1 on selected, second 1 make call option dropdown. display single data default , rest options update. can please help.

this controller:

function(){     vm.editmodeserve = response.data;      var config = $http.get('http:single + id'),         allconfig = $http.get('http:mutiple calls option all');      $q.all([config, allconfig]).then(function (data) {         vm.config = data[0].data;         vm.allconfig = data[1].data; } 

this dropdown:

            <label style="color:rgba(0,0,0,0.54);">configuration</label>             <md-input-container class="md-block">                 <select ng-model="vm.editmodeserve.mainconfig" ng-options="config.configname config in vm.allconfig">                     <option value="">{{vm.config.configname}}</option>                 </select>             </md-input-container> 

{{vm.config.configname}} single call.

about default value , refer here , , make single call rest