javascript - 如何在 angularjs 中将相同的文档推送到数组顶部

Question

我有如下数据，其中我将每个日期存储为一条记录

     {
      "attendances": [
        {
          "_id": "586bb4cf5ab55f517ca4304b",
          "course": {
            "_id": "586645636ce1252f20ba1ad6",
            "name": "Robotics"
          },
          "date":"22/11/2016",
          "ispresent": "Yes",
        },
        {
          "_id": "586bafe95ab55f517ca43048",
          "course": {
            "_id": "586645636ce1252f20ba1ad6",
            "name": "Robotics"
          },
      "date":"21/11/2016",
          "ispresent": "Yes",
        },
{
          "_id": "586bafe95ab55f517ca43048",
          "course": {
            "_id": "586645636ce1252f20ba1ad6",
            "name": "Statistics"
          },
      "date":"21/11/2016",
          "ispresent": "Yes",
        },
         {
          "_id": "586bafe95ab55f517ca43048",
          "course": {
            "_id": "586645636ce1252f20ba1ad6",
            "name": "Statistics"
          },
      "date":"21/11/2016",
          "ispresent": "Yes",
        }
      ],
    }

我希望输出如下表

        Robotics    yes yes
        Statistics  No  yes

我有每门类(class)的每个日期的记录。请有人帮助我。

Answer 1

您可以通过添加一个 groupBy 过滤器来实现这一点，就像 Angular-filter lib https://github.com/a8m/angular-filter 中的过滤器一样。 ，它将根据 name 属性对您的对象进行分组。

然后你的 html 将看起来像这样:

 <div ng-repeat="(key,value) in attendances | groupBy: 'course.name'">
   {{key}} - <span ng-repeat="item in value">{{item.ispresent}}</span>
 </div>

找到这个工作示例:https://plnkr.co/edit/KVVK1A0QJ7VF7DbXZGi5?p=preview