猫鼬/快递人口问题
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【中文标题】猫鼬/快递人口问题【英文标题】：Mongoose/Express population issue 【发布时间】：2021-04-12 04:43:20 【问题描述】：这是我的架构：
1.记录架构：
const mongoose = require('mongoose')
const RecordsSchema = new mongoose.Schema(
Title: type: String, required: true ,
postedby: [
type: mongoose.Schema.Types.ObjectId,
ref: 'user'
],
Author: type: String, required: true ,
ISBN: type: String, required: true ,
Review: type: String ,
SelectedFile: type: String ,
Likes: type: Number, default: 0 ,
Date: type: Date, default: Date.now()
);
module.exports = Records = mongoose.model('record', RecordsSchema, 'record');
这是用户架构：
const mongoose = require('mongoose')
const userSchema = new mongoose.Schema(
username: type: String ,
email: type: String, required: true, unique: true ,
records: [
type: [mongoose.Schema.Types.ObjectId],
ref: 'record'
],
password: type: String, required: true ,
Date: type: Date, default: Date.now(), immutable: true
);
module.exports = User = mongoose.model('user', userSchema, 'user');
获取记录的快捷途径：
router.get('/postedby/', (req, res) =>
Records.findOne()
.populate('postedby')
.exec()
.then(post =>
if (!post)
return res.status(400).json( msg: 'Add Posts' );
else return res.json(post);
).catch(err => console.error(err))
);
路线结果：
"postedby": [],
"Likes": 0,
"_id": "5fed8c12a4fb2c1e98ef09f6",
"Title": "New Age",
"Author": "Situma Prisco",
"ISBN": "23422",
"SelectedFile": "",
"Review": "",
"Date": "2020-12-31T08:30:10.321Z",
"__v": 0
,
我在填充的用户字段(posteddby) 上得到一个空白数组。 请帮忙，我做错了什么？是的，我确实有一个用户登录
【问题讨论】：
使用“Records.findByID()”你得到同样的结果吗？ 【参考方案1】：我实现了你的代码和架构，它对我有用，如果你在数据库中正确存储数据，一切都会好起来的......
注意：
如果postby key的数据没有再次显示，请使用find()而不是findOne()，其他问题需要解决，如猫鼬版本和...，因为您的代码和架构是正确的
find() 对我来说是结果：
[
"postedby": [
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a@test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bca1f1045a4f102bc0ce",
"Title": "farsi",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
,
"postedby": [
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a@test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bca5f1045a4f102bc0cf",
"Title": "farsi",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
,
"postedby": [
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a@test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bcb3f1045a4f102bc0d0",
"Title": "riyazi",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
,
"postedby": [
"records": [
"5ff6bc0bd9e7437184b83f76",
"5ff6bc23d9e7437184b83f78",
"5ff6bc85f1045a4f102bc0cd",
"5ff6bca1f1045a4f102bc0ce",
"5ff6bca5f1045a4f102bc0cf",
"5ff6bcb3f1045a4f102bc0d0",
"5ff6bcc7f1045a4f102bc0d1"
],
"_id": "5ff6b81df463322abc7406ec",
"Date": "2021-01-07T07:28:15.654Z",
"email": "a@test.com",
"password": "$2a$12$wJVDysQxbjuRve.hYn/lbO0rskhwj6y8lwDuEWpCwHeNT/V2mybs.",
"__v": 7
],
"Likes": 1,
"Date": "2021-01-07T07:47:11.610Z",
"_id": "5ff6bcc7f1045a4f102bc0d1",
"Title": "zaban",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
,
"postedby": [
"records": [
"5ff6c275964d062f045e93d3",
"5ff6c283964d062f045e93d5"
],
"_id": "5ff6c253964d062f045e93d2",
"Date": "2021-01-07T08:01:21.499Z",
"email": "b@test.com",
"password": "$2a$12$jmHUrTSPwjaVd0VEIpsGauExHNSukHRyWWiJt4UlEgeWLBo8GPDH.",
"__v": 2
],
"Likes": 1,
"Date": "2021-01-07T08:01:21.990Z",
"_id": "5ff6c275964d062f045e93d3",
"Title": "zaban",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
,
"postedby": [
"records": [
"5ff6c275964d062f045e93d3",
"5ff6c283964d062f045e93d5"
],
"_id": "5ff6c253964d062f045e93d2",
"Date": "2021-01-07T08:01:21.499Z",
"email": "b@test.com",
"password": "$2a$12$jmHUrTSPwjaVd0VEIpsGauExHNSukHRyWWiJt4UlEgeWLBo8GPDH.",
"__v": 2
],
"Likes": 1,
"Date": "2021-01-07T08:01:21.990Z",
"_id": "5ff6c283964d062f045e93d5",
"Title": "tttt",
"Author": "javid1",
"ISBN": "1",
"Review": "1",
"SelectedFile": "1",
"__v": 0
]
【讨论】：
它不会改变结果。 我实现了你的代码和模式，对我有用，数据是否正确存储在数据库中？ Mohammad，非常感谢您抽出宝贵时间对此做出回应。但是，我仍然得到空白数组....还有什么我可能不看的？ 我认为您必须重置数据库，删除所有集合并再次存储数据后，由猫鼬的 populate() 管理的关系将起作用。以上是关于猫鼬/快递人口问题的主要内容，如果未能解决你的问题，请参考以下文章