无法访问猫鼬响应的对象属性 [英] Can't access object property of a Mongoose response

问题描述

我正在node.js上运行这段代码

I'm running this code on node.js

var mongoose = require('mongoose');
mongoose.model('participant',new mongoose.Schema({},{ collection : 'forumParticipant' }));
var Participant = mongoose.model('participant');
mongoose.connect('******');

Participant.find({entity_id: 0}, function (err, docs) {
   console.log(docs[0]);
   console.log(docs[0].entity_id)
});

1)第一个console.log返回完整文档

1) The first console.log return the full document

2)第二个console.log返回未定义

2) The second console.log return undefinied

我不明白为什么.

我需要执行类似的操作

var participants = docs.map(function(d){return d.user_id})

我该如何实现?我想念什么?

How can I achieve that? What am I missing ?

推荐答案

我怀疑您要获取的值不在您的Schema中，而是存储在您的数据库中.

I suspect the value you are trying to get is not in your Schema but is stored in your database.

您从那里有两个解决方案.您可以将entity_id添加到Schema，Mongo将能够将其绑定到收到的Document对象.这是推荐的方法.

You have two solutions from there. You can either add entity_id to your Schema and Mongo will be able to bind it to the Document object you receive. This is the recommended way.

或者您可以绕过猫鼬Schema并使用docs[0]._doc.entity_id访问存储在数据库中的原始文档.除非您知道自己在做什么，否则我不建议您使用这种解决方案.

Or you can bypass mongoose Schema and access the raw document stored in the database with docs[0]._doc.entity_id. I don't recommend this solution unless you know what you're doing.

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