猫鼬 findOne 与排序 [英] mongoose findOne with sorting

问题描述

我的 mongo 请求有问题:

I have a problem with a mongo request:

models.user.findOne(
    {},
    {
        sort: {
            date_register: -1
        }
    },
    function(err, result) {
        console.log(err);
}

我有

{ [MongoError: Error: Unsupported projection option: date_register] name: 'MongoError' }

作为错误

我想通过 date_register DESC 获取我的用户

I'd like to get my users by date_register DESC

谢谢

推荐答案

这会因您的 mongoose 版本而略有不同，但 findOne 的方法签名看起来像这样:

This will vary slightly depending on your version of mongoose, but the method signature for findOne looks something like this:

function findOne (conditions, fields, options, callback)

您打算将什么作为 options(排序)，mongoose 将作为 fields(要加载的字段)进行处理.

What you intend as options (the sort), mongoose is handling as fields (which fields to load).

您可以尝试为字段显式传递 null:

You might try explicitly passing null for fields:

models.user.findOne({}, null, { sort: { date_register: -1 } }, callback);

但是如果可以的话，您应该使用查询 API，它更清晰，例如:

But if you can, you should probably use the query API, which is clearer, like:

models.user.findOne({}).sort({ date_register: -1 }).exec(callback);

这篇关于猫鼬 findOne 与排序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！