用猫鼬找到后如何更改子文档

本文介绍了用猫鼬找到后如何更改子文档的处理方法，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

我有一些类似下面的代码，使用猫鼬.

I have some code like below using mongoose.

var mongoose = require('mongoose'); var Schema = mongoose.Schema; mongoose.connect('mongodb://localhost/hoge'); var UserSchema = new Schema({ name: String, children: [ChildSchema], }); var ChildSchema = new Schema({ name: String, }, {_id: false}); var User = mongoose.model('User', UserSchema); var Child = mongoose.model('Child', ChildSchema); User.findOne({_id: '52299322fdbbdec515000001'}, function(err, user) { console.log(user); for (var i=0; i<user.children.length; i++) { var child = user.children[i]; child.name = 'newchild'; } user.save(function(err) { console.log(user); mongoose.disconnect(); }); });

这是我在mongodb中的记录.

And here is my record in mongodb.

{ "name" : "u1", "_id" : ObjectId("52299322fdbbdec515000001"), "children" : [ { "name" : "c2" } ], "__v" : 0 }

我运行脚本时，其输出如下.

When I run the script, it outputs below.

{ name: 'u1', _id: 52299322fdbbdec515000001, __v: 0, children: [ { name: 'c2' } ] } { name: 'u1', _id: 52299322fdbbdec515000001, __v: 0, children: [ { name: 'newchild' } ] }

但是我在mongodb中的记录没有更改.为什么?

But my record in mongodb has not been changed. Why?

仅供参考，如果我在保存之前插入此代码，记录就会更改.

FYI, the record changed if I insert this code before saving.

user.children.push({name: 'somechild'});

推荐答案

对不起，我已经解决了自己.

Sorry, I've resolved myself.

问题在于声明模式的顺序.

The problem is the order of declarating Schemas.

如果我尝试此更改，它会起作用.

It worked if I tried this change.

/* first, children's schema */ var ChildSchema = new Schema({ name: String, }, {_id: false}); /* seconds, parent's schema */ var UserSchema = new Schema({ name: String, children: [ChildSchema], });