Mongoose find() 返回未定义的属性和奇怪的对象 [英] Mongoose find() returns undefined property and strange object

问题描述

我有一个无法解决的错误，因为这是第一次发生在我身上.

I have a bug that i can't resolve because for the first time it happen to me.

这是我的查询:

    Pack.find(
            {idclient: clientId }
        )
        .populate({
            path: 'cards',
            options: { sort: { 'position': 1 } }
        })
        . exec(function(err,pack){
            if(err){
                console.log(err);
            }else{

                 ///
                // here are my logs

                callback(pack);
            }
        });

当我尝试 console.log(pack) 时，我可以看到 \n 的奇怪返回

When i try console.log(pack), i can see a strange return with \n

{ __v: 1,\n  _id: 5596a859240cbd3832123b27,\n  grouped: 0,\n  idclient: \'4Z8OrisV2AMLZn_lAAAA\',\n  matId: 5596a859240cbd3832123b26,\n  reversed: 0,\n  roomId: 5596a859e37d7e7099cec1e6,\n  shuffled: 0,\n  type: \'hand\',\n  cards: [ 5596a859240cbd3832123b28, 5596a85c240cbd3832123b5d ],\n  date: Fri Jul 03 2015 17:20:57 GMT+0200 (CEST),\n  iscut: 0 }

通常，我可以看到一个很好的格式化 Json 对象.

usually, i can see a nice formated Json Object.

所以，当我尝试:

console.log(pack.property) => 未定义 ...

console.log(pack.property) => undefined ...

有人遇到过这个问题吗?

anyone has had this problem ?

谢谢

推荐答案

这个分为两部分...

首先，Mongoose find 的回调返回一个数组...... findOne 将返回一个对象.

First, the callback from a Mongoose find returns an array ... findOne will return a single object.

就新行而言，猫鼬文档有一个用于 console.log 的 toString() 助手.它可能会添加换行符以提高可读性.在调用 console.log 之前将输出包装在 JSON.stringify(即 console.log(JSON.stringify(pack)))中，您将看到该文档作为没有换行符的字符串.-http://mongoosejs.com/docs/api.html#document_Document-toString

As far as the new lines go, mongoose documents have a toString() helper for console.log. It is likely adding the newlines for readability. Wrap the output in JSON.stringify (ie. console.log(JSON.stringify(pack))) prior to calling console.log and you will see the document as a string without the newlines. -http://mongoosejs.com/docs/api.html#document_Document-toString

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