将对象推入Mongoose中的数组架构 [英] pushing object into array schema in Mongoose
问题描述
我有这个猫鼬模式
var mongoose = require('mongoose');
var ContactSchema = module.exports = new mongoose.Schema({
name: {
type: String,
required: true
},
phone: {
type: Number,
required: true,
index: {unique: true}
},
messages: [
{
title: {type: String, required: true},
msg: {type: String, required: true}
}]
}, {
collection: 'contacts',
safe: true
});
,然后尝试通过以下方式更新模型:
and trying to update the model by doing this:
Contact.findById(id, function(err, info) {
if (err) return res.send("contact create error: " + err);
// add the message to the contacts messages
Contact.update({_id: info._id}, {$push: {"messages": {title: title, msg: msg}}}, function(err, numAffected, rawResponse) {
if (err) return res.send("contact addMsg error: " + err);
console.log('The number of updated documents was %d', numAffected);
console.log('The raw response from Mongo was ', rawResponse);
});
});
我不是在声明messages
接受对象数组吗?
错误: MongoError:无法将$ push/$ pushAll修饰符应用于非数组
I'm I not declaring the messages
to take an array of objects?
ERROR: MongoError: Cannot apply $push/$pushAll modifier to non-array
有什么想法吗?
推荐答案
猫鼬一次完成此操作即可.
mongoose does this for you in one operation.
Contact.findByIdAndUpdate(
info._id,
{$push: {"messages": {title: title, msg: msg}}},
{safe: true, upsert: true},
function(err, model) {
console.log(err);
}
);
请记住,使用此方法将无法使用架构的"pre"功能.
Please keep in mind that using this method, you will not be able to make use of the schema's "pre" functions.
http://mongoosejs.com/docs/middleware.html
从最新的mogoose开始,findbyidandupdate需要添加一个"new:true"可选参数.否则,您将得到旧文档给您.因此,Mongoose版本4.x.x的更新转换为:
As of the latest mogoose findbyidandupdate needs to have a "new : true" optional param added to it. Otherwise you will get the old doc returned to you. Hence the update for Mongoose Version 4.x.x converts to :
Contact.findByIdAndUpdate(
info._id,
{$push: {"messages": {title: title, msg: msg}}},
{safe: true, upsert: true, new : true},
function(err, model) {
console.log(err);
}
);
这篇关于将对象推入Mongoose中的数组架构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!