Javascript 猫鼬保存 vs 插入 vs 创建
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mongoose save vs insert vs create
提问by Maria Jane
What are different ways to insert a document(record) into MongoDB using Mongoose?
使用 Mongoose 将文档（记录）插入到 MongoDB 中有哪些不同的方法？
My current attempt:
我目前的尝试：
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var notificationsSchema = mongoose.Schema({
"datetime" : {
type: Date,
default: Date.now
},
"ownerId":{
type:String
},
"customerId" : {
type:String
},
"title" : {
type:String
},
"message" : {
type:String
}
});
var notifications = module.exports = mongoose.model('notifications', notificationsSchema);
module.exports.saveNotification = function(notificationObj, callback){
//notifications.insert(notificationObj); won't work
//notifications.save(notificationObj); won't work
notifications.create(notificationObj); //work but created duplicated document
}
Any idea why insert and save doesn't work in my case? I tried create, it inserted 2 document instead of 1. That's strange.
知道为什么插入和保存在我的情况下不起作用吗？我尝试创建，它插入了 2 个文档而不是 1 个。这很奇怪。
回答by Iceman
The .save()is an instance method of the model, while the .create()is called directly from the Modelas a method call, being static in nature, and takes the object as a first parameter.
的.save()是该模型的一个实例方法中，当.create()直接从被呼叫Model作为一个方法调用，在本质上静态的，拍摄对象作为第一参数。
var mongoose = require('mongoose');
var notificationSchema = mongoose.Schema({
"datetime" : {
type: Date,
default: Date.now
},
"ownerId":{
type:String
},
"customerId" : {
type:String
},
"title" : {
type:String
},
"message" : {
type:String
}
});
var Notification = mongoose.model('Notification', notificationsSchema);
function saveNotification1(data) {
var notification = new Notification(data);
notification.save(function (err) {
if (err) return handleError(err);
// saved!
})
}
function saveNotification2(data) {
Notification.create(data, function (err, small) {
if (err) return handleError(err);
// saved!
})
}
Export whatever functions you would want outside.
导出您想要的任何功能。
More at the Mongoose Docs, or consider reading the reference of the Modelprototype in Mongoose.
更多在Mongoose Docs，或者考虑阅读ModelMongoose 中原型的参考。
