选择中的ng-init在angularJS中不起作用

我有一个像这样的Select元素

 <select class="form-control" id="designation" ng-model="employee.designation" ng-init="select Designation = options[0]" ng-options="d for d in designations" required></select>

现在我想将这个元素的初始值设置为默认值，比如'Select Designation‘。我如何才能做到这一点？我可以绑定这些值，但是我不能设置默认值，有人能帮我吗！

控制器代码如下所示

(function () {
            var app = angular.module('mainApp', []);
            app.controller('employeeCtrl', ['$scope', '$http', function ($scope, $http) {
                this.employee = {};

                $http.get('/Data/Designation.json').success(function (data) {
                    debugger;
                    $scope.designations = data;
                }).error(function () {
                    alert('error !!!');
                });
                $scope.formSubmit = function () {
                    debugger;
                };
            }]);
        })();

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