I've md-select with multiple options enabled. By default ng-model of md-select does have one OBJECT value as array element.
on click/on selection of md-option - I want to update ng-model of md-select (Parent md-select)
<md-input-container class="md-block">
<md-select ng-model="selected_item" ng-model-options="{trackBy: \'$value.id\'}" multiple>
<md-option ng-value="item" ng-click="onSelectItem(item)" ng-repeat="item in items">{{item.name}}</md-option>
</md-select>