javascript 如何在 mongoose 对象上添加临时属性仅用于响应，该属性未存储在数据库中
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How do I add temporary properties on a mongoose object just for response, which is not stored in database
提问by bobmoff
I would like to fill a couple of extra temporary properties with additional data and send back to the response
我想用额外的数据填充几个额外的临时属性并发送回响应
'use strict';
var mongoose = require('mongoose');
var express = require('express');
var app = express();
var TournamentSchema = new mongoose.Schema({
createdAt: { type: Date, default: Date.now },
deadlineAt: { type: Date }
});
var Tournament = mongoose.model('Tournament', TournamentSchema);
app.get('/', function(req, res) {
var tournament = new Tournament();
// Adding properties like this 'on-the-fly' doesnt seem to work
// How can I do this ?
tournament['friends'] = ['Friend1, Friend2'];
tournament.state = 'NOOB';
tournament.score = 5;
console.log(tournament);
res.send(tournament);
});
var server = app.listen(3000, function() {
console.log('Listening on port %d', server.address().port);
});
But the properties wont get added on the Tournament object and therefor not in the response.
但是这些属性不会添加到 Tournament 对象上，因此不会添加到响应中。
回答by bobmoff
Found the answer here: Unable to add properties to js object
在这里找到答案：无法向 js 对象添加属性
I cant add properties on a Mongoose object, I have to convert it to plain JSON-object using the .toJSON()or .toObject()methods.
我无法在 Mongoose 对象上添加属性，我必须使用.toJSON()or.toObject()方法将其转换为普通的 JSON 对象。
EDIT:And like @Zlatko mentions, you can also finalize your queries using the .lean() method.
编辑：就像@Zlatko 提到的那样，您还可以使用 .lean() 方法完成查询。
mongooseModel.find().lean().exec()
... which also produces native js objects.
...这也产生了原生 js 对象。
