【发布时间】：2021-12-11 03:50:39
【问题描述】：
您好，我正在制作一个基本的社交应用程序，目前它有一个 Account 和一个 Post 模型。
我可以显示Account 模型以及更多内容，但我在显示所有帖子时遇到了Post 模型的问题。
即使我在数据库中有帖子，allPosts.js 中的猫鼬函数 Post.find({}).exec(function(err, posts) 也会不断返回 undefined。
注意：我可以成功发布到 posts 集合，只是无法读取它们。
我可以显示所有帐户，但不能显示所有帖子。
更新：我现在可以创建一个帖子，然后被重定向回allPosts.pug 页面并查看除刚刚创建的帖子之外的所有帖子，请查看addNewPost.js。
我希望能够从我的登录页面进入并显示所有帖子查看index.js
/* Account.js */
const mongoose = require("mongoose")
const Account = mongoose.model("Account", {
name: String,
lastName: String,
email: {type: String, unique: true, lowercase: true, required: true},
phoneNumber: String,
password: String
})
module.exports = Account
/* Post.js */
const mongoose = require("mongoose")
const Post = mongoose.model("Post", {
emailId: {type: String, required: true},
postTitle: {type: String, required: true},
postMessage: {type: String, required: true},
datePosted: {type: Date, default: Date.now},
})
module.exports = Post
/* allPosts.js */
var express = require('express');
var router = express.Router();
const Account = require("../models/account")
const Post = require("../models/post")
/* GET all posts page. */
router.get('/', function(req, res, next) {
Post.find({}).exec(function(err, posts) {
res.render("allPosts", {title: "Social Application", posts: posts})
})
})
module.exports = router;
/* allPosts.pug */
extends layout
block content
h1 #{title}
if posts === undefined
h1 No posts to show here
else
each post in posts
div(class="container")
div(class="jumbotron")
h1= post.postTitle
h1= post.postMessage
br
a(href="/addNewPost"): button(class="btn btn-primary float-end") Add post
a(href="/logout"): button(class="btn btn-primary float-end") Logout
/* addNewPost.js */
var express = require('express');
const Post = require('../models/post');
var router = express.Router();
/* GET all posts page. */
router.get('/', function(req, res, next) {
res.render("addNewPost", {title: "Social Application"})
});
router.post('/', function(req, res, next) {
var emailId = req.session.email
var postTitle = req.body.postTitle
var postMessage = req.body.postMessage
var postData = {
emailId: emailId,
postTitle: postTitle,
postMessage: postMessage
}
var aPost = new Post(postData)
aPost.save(function(err) {
if (err) {
console.log(err)
} else {
console.log("Post saved successfully !")
}
})
Post.find({}).exec(function(err, posts) {
res.render("allPosts", {title: "All posts", posts: posts})
})
})
module.exports = router;
/* index.js */
var express = require('express');
var router = express.Router();
const Account = require("../models/account")
const bcrypt = require("bcrypt");
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: "Social Application" });
});
/* POST home page */
router.post('/', function(req, res, next) {
var email = req.body.email
var password = req.body.password
Account.findOne({email:email}).exec(function(err, account) {
if (account) {
if (bcrypt.compareSync(password, account.password)) {
req.session.email = account.email
req.session.userLoggedIn = true
res.render("allPosts", {title: "All Posts"})
} else {
res.render("index", {error: "Your credentials are incorrect !", title: "Social Application"})
}
} else {
res.render("index", {error: "This account does not exist !", title: "Social Application"})
}
})
})
module.exports = router;
/* Trace */
TypeError: C:\Users\bmxfi\Desktop\code\NodeJavascript\SocialApplication\SocialApplication\views\allPosts.pug:7
5|
6|
> 7| each post in posts
8| div(class="container")
9| div(class="jumbotron")
10| h1= post.postTitle
Cannot read property 'length' of undefined
at eval (eval at wrap (C:\Users\bmxfi\node_modules\pug\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:36:32)
at eval (eval at wrap (C:\Users\bmxfi\node_modules\pug\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:71:4)
at template (eval at wrap (C:\Users\bmxfi\node_modules\pug\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:93:7)
at Object.exports.renderFile (C:\Users\bmxfi\node_modules\pug\lib\index.js:454:38)
at Object.exports.renderFile (C:\Users\bmxfi\node_modules\pug\lib\index.js:444:21)
at View.exports.__express [as engine] (C:\Users\bmxfi\node_modules\pug\lib\index.js:493:11)
at View.render (C:\Users\bmxfi\node_modules\express\lib\view.js:135:8)
at tryRender (C:\Users\bmxfi\node_modules\express\lib\application.js:640:10)
at Function.render (C:\Users\bmxfi\node_modules\express\lib\application.js:592:3)
at ServerResponse.render (C:\Users\bmxfi\node_modules\express\lib\response.js:1012:7)
【问题讨论】：
标签： node.js mongodb mongoose mongoose-populate