使用ng-model的DropDown选项未被选中？我需要根据$ index和$ parent。$ index动态创建ng-model

Question

JSON monthA：

[
  [
    {
      "monthNumber": "8",
      "monthName": "August"
    },
    {
      "monthNumber": "9",
      "monthName": "Septemeber"
    },
    {
      "monthNumber": "10",
      "monthName": "October"
    },
    {
      "monthNumber": "11",
      "monthName": "November"
    },
    {
      "monthNumber": "12",
      "monthName": "December"
    },
    {
      "monthNumber": "1",
      "monthName": "January"
    },
    {
      "monthNumber": "2",
      "monthName": "February"
    }
  ],

]

HTML部分：

<td ng-repeat="ap in monthA" style="width:100px;" align="center" >
    <select ng-model="rishi_Testing" ng-options="value.monthNumber as value.monthName for value in ap track by value.monthNumber">
        <option value=""></option>
    </select>
</td>

我正在使用上面写的代码使用ng-options创建一个下拉列表。但选项没有被选中。虽然我能够点击选项，但它们没有被填充为选定的值。我怀疑这是因为重复的ng模型，因此我试图创建动态ng模型？ 帮我？ 启发我？