流星：排序表

Question

我幾乎完成了我的流星投票項目，它基於Meteor排行榜，但我有一個小問題。

我的數據庫中的每個項目都有一個包含給定分數的數組。我總結數組並在我的應用程序中顯示結果。問題：它沒有排序，它只按名稱排序（name = _id）。

HTML：

<template name="voting"> 
    {{#each books}} 
     {{> book}} 
    {{/each}} 
</template> 
<template name="book"> 
    <div class="book {{selected}}"> 
     <span class="name">{{_id}}</span> 
     <span class="totalscore">{{totalscore}}</span> 
    </div> 
</template> 

JS

Template.voting.books = function() { 
    return Books.find({flag: "score20130901"}, {sort: {totalscore: -1, _id: 1}}); 
}; 

Template.book.totalscore = function() { 
    var total = 0; 
    for (var i=0; i<6; i++) { 
     total += this.score20130901[i]; 
    } 
    return total; 
}; 

DB（文檔的例子）

{ 
    _id: "Dancing Joe", 
    flag: "score20130901", 
    score20130714: [0,0,8,0,0], 
    score20130901: [0,4,0,5,0] 
} 

Answer 1

我想我明白了。試試這個（Underscore.js是我們這裏的朋友）：

Template.voting.books = function() { 
    // First, get the books as an array 
    var books = Books.find({flag: "score20130901"}).fetch(); 
    // Next, loop through the books, using underscore's sortBy method 
    return _.sortBy(books, function (book) { 
     // For each book, the number it should sort by is the sum of numbers in the score array 
     return _.reduce(book.score20130901, function (memo, num) { 
      return memo + num; 
     }); 
    }).reverse(); // reverse() here for descending order 
};