angular 深层嵌套ngRepeat中获取radio的值和checkbox的值

做问卷调查功能项目时，使用了ng-repeat 里面嵌套 ng-repeat 然后获取radio的ng-model值时，发现只能获取到当前点到的radio的值；而点击checkbox的时候，angular报错 Error: [$rootScope:infdig]，代码如下：

html结构：
<ul class="options_box" >
    <li ng-repeat="item in ques"  >                        
        <div class="opt" ng-repeat="nums in item.ques_item_options track by $index">
        <!-- 单选 -->
            <input type="radio"  class="magic-radio " name="{{nums.ques_item_option}}" 
                    value="{{item.ques_item_id}},{{nums.item_option_id}}" 
                    id="{{nums.item_option_id}}" 
                    title="{{nums.ques_item_option}}" 
                    ng-model="formdata.option_id[$index]" 
                    ng-if="item.ques_item_type==1" ng-required="required"
            />
        <!-- 多选 -->
            <input class="magic-checkbox" type="checkbox" name="{{nums.ques_item_option}}" 
                id="{{nums.item_option_id}}" 
                ng-model="formdata.item_option_id[$index]"  
                ng-true-value="'{{item.ques_item_id}},{{nums.item_option_id}}'"
                ng-false-value="'NO'" 
                ng-checked="formdata.item_option_id[$index]"  
                ng-if="item.ques_item_type==2" 
                ng-checked="nums.selected"
                ng-required="formdata.item_option_id[$index]"
            />
            <label for="{{nums.item_option_id}}">
                <p class="right">
                    <i ng-bind="nums.item_option_id"></i>
                    <i ng-bind="nums.ques_item_option"></i>
                </p>
            </label>
        </div>
    </li>
</ul>

如何取到第二级嵌套的ng-model的？
只需要在第几层的ng-model上加上相应级数的$parent，然后后面加上model的定义值即可

赏

谢谢你请我吃糖果