Angular chosen: ng-model in the add/edit mode

Question

I have an ObjectA including a list of ObjectB and the relation between the two objects is many to many:

$scope.objectA = {
name: “”,
objectsB: []
}

At first I load all the existing objectsB from the ObjectB table. I put them into the select options list. Then in the add mode, from a button, I let the user add a new select then he chooses a value. If he adds multiple selects, the selected value of each one is pushed in the $scope.objectA.objectsB.

The problem I’m facing is in the edit mode. For example, if I want to edit an objectA that has 3 objectB, I can see 3 selects in my view but the values are not displayed (the values in the $scope.objectA.objectsB)

This is my HTML:

   <div class="form-group" style="padding-left: 0px;" ng-repeat="objectB in objectA.objectsB">

                                <select chosen disable-search-threshold="1"  ng-model="objectB.id"
                                        ng-options="objectB.id as objectB.name for objectB in objectsB track by objectB.id">
                                    <option value="">&nbsp;</option>
                                </select>

                        </div>