Set selected value in Select2 using angularjs

I have a Drop down in my Anjularjs Application implemented using 'ui.select2'

I had initialized it as below

  <input type="text" ng-model="objCas.iProjectId" id=" iprojectid" ui-select2="iProjectIdOption" />

And My Js Implementation is getting data from remote server with pagination and filter

  var app = angular.module('CASApp', ['ui.select2', 'checklist-model']);
        app.controller('CASController', function ($scope, $http) {


            $scope.iProjectIdOption = {
                placeholder: "Click to choose the Project...",
                allowClear: true,
                initSelection: function (element, callback) {

                },
                ajax: {
                    url: "/Prj/dummy/Ajaxlist",
                    quietMillis: 0,
                    type: "POST",
                    data: function (term, page) {
                        return {
                            q: term,
                            page: page,
                            listType: "ProjectDetails"
                        }; // query params go here
                    },
                    results: function (data, page) { // parse the results into the format expected by Select2.
                        // since we are using custom formatting functions we do not need to alter remote JSON data
                        var more = (page * 30) < data.total_count; // whether or not there are more results available
                        return {
                            results: $.map(data.items, function (item) {
                                return {
                                    text: item.text,
                                    id: item.id
                                }
                            }),
                            more: more
                        }
                    },
                    cache: true
                }
            }
}
}

Everything works fine .I am able to use all the features and post the values also. But problem is with setting the already selected values at time of edit

Tried

    $Scope.objCas.iProjectId= {"text":"2010 / 256 - / dummytext","id":240}    
    $Scope.objCas.iProjectId=2;
    $scope.iProjectId.selected = {"text":"2010 / 256 - / dummytext","id":240}

Get the select2 element object and apply the following code:

angular.element("#select2_id").select2('data', { "text": "text", "id": [id]});