Question

我试图将具有相似时间范围的用户插入到集合中的文档组合在一起。我正在寻找文档或代码片段，以便在这个伪代码上向我推进正确的方向;

User submits a number of documents (over the course of five minutes) into a collection.
Documents are grouped together with similar timeframe.
User is returned a list of objects that were inserted within a timeframe (eg. 1hr).

为清晰起见编辑：

带有时间戳的数据库的发布功能正常，我可以在下面正确地看到存储在我的集合中的文档;

{ "text" : "beef", "createdBy" : "X9Px6qKRjiB53ANST", "createdAt" : ISODate("2015-02-03T00:47:21.976Z"), "_id" : "sJhwcLCRS4CG6yfTe" }
{ "text" : "beef", "createdBy" : "X9Px6qKRjiB53ANST", "createdAt" : ISODate("2015-02-03T00:47:41.265Z"), "_id" : "NGBwiWZRsDBbNerSy" }
{ "text" : "Chicken", "createdBy" : "X9Px6qKRjiB53ANST", "createdAt" : ISODate("2015-02-03T02:47:21.163Z"), "_id" : "R2FYAjZamTWTy9RTW" }
{ "text" : "Chicken", "createdBy" : "X9Px6qKRjiB53ANST", "createdAt" : ISODate("2015-02-03T04:42:02.895Z"), "_id" : "F7u2EfBEmYLBaFgze" }

如何将同一小时内提交的文件组合在一起（例如，牛肉文件并将其返回给用户？我有一个基本的返回功能，可以返回所有条目，但我可以＆＃39;找到很多关于按小时分组数据的信息。

Meteor.publish('theFoods', function(){
    var currentUser = this.userId;

    return Foods.find({
        createdBy: currentUser
    })
});

Answer 1

你可以添加一个帮手，如：

Template.myTemplate.helpers({
  foodsByHour: function() {
    var foods = Foods.find().fetch();
    return _.chain(foods)
      .groupBy(function(food) {
        if (food.createdAt)
          return food.createdAt.getHours();
      })
      .map(function(v, k) {return {hour: k, foods: v};})
      .value();
  }
});

这将返回hour和foods对的数组，如下所示：

[ { hour: '16',
    foods: 
     [ { text: 'beef',
         createdBy: 'X9Px6qKRjiB53ANST',
         createdAt: Mon Feb 02 2015 16:47:21 GMT-0800 (PST),
         _id: 'sJhwcLCRS4CG6yfTe' },
       { text: 'beef',
         createdBy: 'X9Px6qKRjiB53ANST',
         createdAt: Mon Feb 02 2015 16:47:41 GMT-0800 (PST),
         _id: 'NGBwiWZRsDBbNerSy' } ] },
  { hour: '18',
    foods: 
     [ { text: 'Chicken',
         createdBy: 'X9Px6qKRjiB53ANST',
         createdAt: Mon Feb 02 2015 18:47:21 GMT-0800 (PST),
         _id: 'R2FYAjZamTWTy9RTW' } ] },
  { hour: '20',
    foods: 
     [ { text: 'Chicken',
         createdBy: 'X9Px6qKRjiB53ANST',
         createdAt: Mon Feb 02 2015 20:42:02 GMT-0800 (PST),
         _id: 'F7u2EfBEmYLBaFgze' } ] } ]

这是一个示例模板：

<template name='myTemplate'>
  {{#each foodsByHour}}
    <h2>{{hour}}</h2>
    {{#each foods}}
      <p>{{text}}</p>
    {{/each}}
  {{/each}}
</template>

从类似时间插入的mongo返回对象

1 个答案: