angularjs ng-repeat checkbox

js 
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<div class="col-md-3" ng-repeat="user in title.UserList">
    <p class="form-control-static">
        <input type="checkbox" ng-checked="user.Role" ng-model="item.UserId[user.UserId]" ng-true-value="'add_{{user.UserId}}'" ng-false-value="'del_{{user.UserId}}'"/>&nbsp;{{user.UserName}}
    </p>
</div>