Mongo按动态字段排序

本文介绍了Mongo按动态字段排序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

因此，我传入了一个动态变量，该变量是我要排序的字段的名称.

So I have a dynamic variable being passed in that is the name of the field that I would like to sort on.

让我们说下面的sortVariable可以等于价格"，"createdAt"，名称"等.这不起作用，我该怎么办?

Let's say sortVariable below could equal "price", "createdAt", "name" etc. This isn't working, how can I do this?

function findStuff (sortVariable) {
    var postings = Postings.find({
      "device.name": filter.exactDevice,
    }, {
      sort: {
        sortVariable: 1
      }
    });
    return postings;
}

推荐答案

您不能将变量用作对象常量中的键.试试看:

You can't use variables as keys in object literals. Give this a try:

var findStuff = function(sortVariable) {
  var sort = {};
  sort[sortVariable] = 1;

  return Postings.find({
    'device.name': filter.exactDevice
  }, {
    sort: sort
  });
};

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