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我正在查询所有comments和commentLikes. 本质上，我在我的视图中循环浏览评论集合，但我需要commentLikes与comments. 现在commentLikes有一个引用comments._idas commentLikes.comment_id。

我正在考虑为此使用下划线，因为看起来有一些不错的实用功能，但我会使用哪些？我最终玩了，_.where但不确定这是否是适合这项工作的工具。

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？使用多个 Mongoose 集合执行此操作的正确方法是什么？我来自传统的 MySQL 背景，所以我已经习惯了没有关联。

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1 回答 1

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您可以使用下划线来做到这一点groupBy，map 这是工作示例。

您也可以在“mongodb”中组合您的收藏，使用mapReduce 查看此处了解更多详细信息。

于 2013-03-31T13:21:19.557 回答