How to make ng-repeat filter out duplicate results

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You could use the unique filter from AngularUI (source code available here: AngularUI unique filter) and use it directly in the ng-options (or ng-repeat).

<select ng-model="orderProp" ng-options="place.category for place in places | unique:'category'">
    <option value="0">Default</option>
    // unique options from the categories
</select>

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