javascript - How to use ng-options to iterate through an array within an object? -

how can use ng-options populate select element results of "categories" arrays, within objects?

        {           title: "star wars",           categories: ["coding", "exploration", "adventure"]         }, {           title: "street wars",           categories: ["surfing", "exploration", "testing"]         }, 

i want populate select element available categories, , use "unique" filter out duplicate entries...

as comment says, it's easier create unique part in controller, , use ngoptions on new array:

$scope.uniqueoptions = []; (var = 0; < data.length; i++) {     (var j = 0; j < data[i].categories.length; j++) {         if ($scope.uniqueoptions.indexof(data[i].categories[j]) === -1) {             $scope.uniqueoptions.push(data[i].categories[j])         }     } } 

and options:

<select ng-model="somemodel" ng-options="category category category in uniqueoptions"> </select>