Javascript 在meteorjs应用程序&；中从我的收藏中删除重复项&；渲染每个玩家最近的分数

我正在开发一个Meteorjs应用程序，它在后端使用MongoDB。在我的收藏中，有许多重复的数据，如（仅举一个例子）

我想将所有这些集合复制到一个数组中，删除重复的名字，只保存每个玩家的名字和最近的分数，例如

{name:'A',score: 2, date: 4456546}
{name:'B',score: 2, date: 4456546}
{name:'C',score: 2, date: 4456546}

为此，我尝试使用update方法$puch，但不起作用

你知道怎么解决这个问题吗？？

---

thak’s help

不完全清楚您想做什么，但您可以使用下划线来查找唯一的值。在下面的示例中，我使用sort将值从最高日期排序到最低日期。接下来，我将uniq函数与iteratee函数一起使用，该函数返回名称作为检查唯一性的值

var allScores = [
    {name:'A',score: 2, date: 4456546},
    {name:'A',score:33, date:3453454},
    {name:'A',score:34, date: 3453},
    {name:'A',score:0, date: 12334},
    {name:'B',score:34, date: 3453},
    {name:'B',score:0, date: 12334},
    {name:'B',score: 2, date: 4456546},
    {name:'B',score:33, date:3453454},
    {name:'C',score:33, date:3453454},
    {name:'C',score: 2, date: 4456546},
    {name:'C',score:34, date: 3453},
    {name:'C',score:0, date: 12334}
];

var latestScores = _(allScores).chain().sort(function(a,b){return (b.date - a.date)}).uniq(function (x){ return x.name }).value();

// latestScores equals [{name:'A',score: 2, date: 4456546},{name:'B',score: 2, date: 4456546},{name:'C',score: 2, date: 4456546}]

您必须自己处理更新数据库的问题。最好先做个备份

var allScores = [
    {name:'A',score: 2, date: 4456546},
    {name:'A',score:33, date:3453454},
    {name:'A',score:34, date: 3453},
    {name:'A',score:0, date: 12334},
    {name:'B',score:34, date: 3453},
    {name:'B',score:0, date: 12334},
    {name:'B',score: 2, date: 4456546},
    {name:'B',score:33, date:3453454},
    {name:'C',score:33, date:3453454},
    {name:'C',score: 2, date: 4456546},
    {name:'C',score:34, date: 3453},
    {name:'C',score:0, date: 12334}
];

var latestScores = _(allScores).chain().sort(function(a,b){return (b.date - a.date)}).uniq(function (x){ return x.name }).value();

// latestScores equals [{name:'A',score: 2, date: 4456546},{name:'B',score: 2, date: 4456546},{name:'C',score: 2, date: 4456546}]