Vue.js 只显示具有唯一属性的对象 [英] Vue.js only show objects with a unique property

问题描述

我正在建立一个排行榜.我有一个领导者的集合.有多个来自同一团队的参赛作品.我只想显示每个团队的一个条目(最好是最近的).我正在为数据库使用 Firestore.

我的 html 看起来像这样.(为了简单起见，我缩短了代码)

<div>{{tracker.team.team_name}}</div>

如果我将这个 {{ tracker }} 添加到 HTML，这就是一个跟踪器分离出来的内容

<代码>{团队": {"bio": "
This is Team One's Bio
","fullPath": "头像/XXXXXX.jpg","team_id": "1","team_name": "第一队","url": "XXXXXXX","id": "XXXXXXX"},跟踪器":{"线索": "2",代码":23456"，差异":5269841，团队":1"}}

我有多个团队.我只想为每个 "team" 显示一个跟踪器，所以基本上按 "teams"

分组

非常感谢任何帮助

解决方案

既然你标记了计算属性问题，你就走对了.只需创建一个计算属性，将跟踪器限制为独特的团队.

计算:{团队(){返回 this.trackers.reduce((teams, tracker) => {if (teams.find(team => team.team_id === tracker.team.team_id) === 未定义) {团队.推(跟踪器.团队)；}归队；}, []);}}

然后在模板中使用计算属性.

<div>{{team.team_name}}</div>

如果您需要与团队关联的跟踪器信息，请改为为唯一跟踪器创建一个计算属性.

I am building a Leaderboard. I have a collection of leaders. There are multiple entries from the same teams. I would like to only show one entry per team (most recent preferably). I am using Firestore for the database.

My html looks like this. (I shortened the code for simplicity)

<div v-for="tracker in trackers" :key="tracker.id">
    <div>{{tracker.team.team_name}}</div>
</div>

If I add this {{ tracker }} to the HTML this is what one tracker splits out

{
  "team": {
    "bio": "<div><!--block-->This is Team One's Bio</div>",
    "fullPath": "avatars/XXXXXX.jpg",
    "team_id": "1",
    "team_name": "Team One",
    "url": "XXXXXXX",
    "id": "XXXXXXX"
  },
  "tracker": {
    "clue": "2",
    "code": "23456",
    "diff": 5269841,
    "team": "1"
  }
}

I have multiple teams. I would like to only show one tracker per "team" so basically group by "teams"

Any help is much appreciated

解决方案

Since you tagged the question computed-properties, you're on the right track. Just create a computed property that limits the trackers to unique teams.

computed: {
    teams() {
        return this.trackers.reduce((teams, tracker) => {
            if (teams.find(team => team.team_id === tracker.team.team_id) === undefined) {
                teams.push(tracker.team);
            }
            return teams;
        }, []);
    }
}

Then use the computed property in your template.

<div v-for="team in teams" :key="team.team_id">
    <div>{{team.team_name}}</div>
</div>

If you need the tracker information associated with the team, create a computed property for unique trackers instead.

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