计算表达式为真的数组中的项目

我是一个有角度的新手

我有一个带有模板的指令，看起来像这样：

<div class="multiselect-styled">
    <a href="javascript:void(0);" class="link" id="link-{{ model.ControlId }}">
        <span class="options-selected" id="selected-options-{{ model.ControlId }}">TEXT</span>
        <span class="select-arrows"></span>
    </a>
</div>

Mymodel包含一个名为的数组Options，其中包含n许多可选选项。每个选项对象都有一个布尔属性；Selected。我想TEXT用一个字符串代替n options selected。那么，如何获得所选选项的数量？

当然，使用循环会执行类似的操作，但是n在这种情况下我是否可以直接绑定到某种方式（查找n表达式）？

            var n = 0;
            angular.forEach(model.Options, function(option) {
                if (option.Selected)
                    n++;
            });

更新1

选项如下所示：

"Options": [
      {
        "Id": "ApprovedAndClosed",
        "Value": "ApprovedAndClosed",
        "Text": "ApprovedAndClosed",
        "Selected": false,
        "Code": "ApprovedAndClosed"
      },
      {
        "Id": "Cancel",
        "Value": "Cancel",
        "Text": "Cancel",
        "Selected": false,
        "Code": "Cancel"
      },
      {
        "Id": "Done",
        "Value": "Done",
        "Text": "Done",
        "Selected": false,
        "Code": "Done"
      },
      {
        "Id": "Init",
        "Value": "Init",
        "Text": "Init",
        "Selected": false,
        "Code": "Init"
      },
      {
        "Id": "ReadyForProcessing",
        "Value": "ReadyForProcessing",
        "Text": "ReadyForProcessing",
        "Selected": false,
        "Code": "ReadyForProcessing"
      },
      {
        "Id": "Rejected",
        "Value": "Rejected",
        "Text": "Rejected",
        "Selected": false,
        "Code": "Rejected"
      },
      {
        "Id": "Reminder",
        "Value": "Reminder",
        "Text": "Reminder",
        "Selected": false,
        "Code": "Reminder"
      }
]