用猫鼬找到后如何更改子文档 [英] How to change sub document after finding with mongoose

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],
});

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