如何在动态列表中使用ng-if创建字段（包括索引）？

I've used this method a thousand times to create a "please describe" field when the "other" option is selected, but it is not working when it is part of a dynamic list. Something about the addition of the index is making it not work. How can I make this work in a dynamic list?I've used this method a thousand times to creat