Javascript 将2个MongoDB集合对象与下划线或其他内容组合？

我正在查询所有评论和评论。基本上，我在视图中循环浏览评论集合，但我需要将commentLikes与评论关联起来。现在commentLikes引用了comments.\u id为commentLikes.comment\u id

我正在考虑使用下划线，因为看起来有一些不错的实用函数，但我会使用哪些呢？我最后玩了uz。where，但我不确定这是否是适合这份工作的工具

这是最好的方法吗

var comments = 
[ { submission_id: '513d3702b99f8b1ca5000026',
    comment: 'asdfnasdfoiasdfiosdaf',
    user_id: '1',
    _id: '5157e79c562277e457000011',
    deleted: false,
    created: 'Sun Mar 31 2013 00:37:00 GMT-0700 (PDT)',
    parent_id: null },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment: 'asdfioasdfoiasdjiofasdijofjiasodf',
    user_id: '1',
    _id: '5157e799562277e457000010',
    deleted: false,
    created: 'Sun Mar 31 2013 00:36:57 GMT-0700 (PDT)',
    parent_id: null },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment: 'sdafijsadjiofasoijfjaiosdfjioasdfjiosdaf',
    user_id: '1',
    _id: '5157e797562277e45700000f',
    deleted: false,
    created: 'Sun Mar 31 2013 00:36:55 GMT-0700 (PDT)',
    parent_id: null },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment: 'asdfjiadsfojidfsjoaifdaijofdasijods',
    user_id: '1',
    _id: '5157e794562277e45700000e',
    deleted: false,
    created: 'Sun Mar 31 2013 00:36:52 GMT-0700 (PDT)',
    parent_id: null },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment: 'asdfiasdfijoasdfoijas',
    user_id: '1',
    _id: '5157e40227bf651157000280',
    deleted: false,
    created: 'Sun Mar 31 2013 00:21:38 GMT-0700 (PDT)',
    parent_id: null } ];

var commentLikes =
    [ { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e40227bf651157000280',
    user_id: 1,
    _id: '5157e40527bf651157000286',
    created: 'Sun Mar 31 2013 00:21:41 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e40227bf651157000280',
    user_id: 1,
    _id: '5157e40b27bf65115700028e',
    created: 'Sun Mar 31 2013 00:21:47 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e797562277e45700000f',
    user_id: 1,
    _id: '5157e7cc9c1fe3ed57000001',
    created: 'Sun Mar 31 2013 00:37:48 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e799562277e457000010',
    user_id: 1,
    _id: '5157e7cd9c1fe3ed57000002',
    created: 'Sun Mar 31 2013 00:37:49 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e79c562277e457000011',
    user_id: 1,
    _id: '5157e7ce9c1fe3ed57000003',
    created: 'Sun Mar 31 2013 00:37:50 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e79c562277e457000011',
    user_id: 1,
    _id: '5157e7d19c1fe3ed57000004',
    created: 'Sun Mar 31 2013 00:37:53 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e79c562277e457000011',
    user_id: 1,
    _id: '5157e7d29c1fe3ed57000005',
    created: 'Sun Mar 31 2013 00:37:54 GMT-0700 (PDT)' },
  { submission_id: '513d3702b99f8b1ca5000026',
    comment_id: '5157e79c562277e457000011',
    user_id: 1,
    _id: '5157e7d29c1fe3ed57000006',
    created: 'Sun Mar 31 2013 00:37:54 GMT-0700 (PDT)' } ];

var newCommentObj = comments;

_.map(newCommentObj, function(key) {
    // get commentLikes for each comment
    var commentId = key._id,
        likes = _.where(commentLikes, {comment_id : commentId});

});

---

如果没有，我应该怎么做？对于多个猫鼬收藏，正确的方法是什么？我来自传统的MySQL背景，所以我已经习惯了没有关联。

您可以使用下划线的groupBy并映射工作示例

---

此外，您还可以使用mapReduce在mongodb上合并您的集合以获取更多详细信息。

Hm好的，所以我想我可能有一个问题，因为返回的内容实际上没有字符串化，所以newCommentObj将返回以下内容：。在本例中，有2条注释，其中一条注释如下。我试图对每条评论的id进行字符串化，但没有任何帮助。事实上，没关系。当它打印到控制台时，似乎没有显示嵌套的内容。。。奇怪的但它们实际上是被发送到视图中的。这就解决了。谢谢