【发布时间】：2020-10-29 15:34:01
【问题描述】：
我是一名初学者网络开发人员（目前处于学习阶段）。
所以，我尝试制作我的第一个小型后端项目（待办事项应用程序），但遇到了数据库问题。
我使用 MongoDB 和 Mongoose 作为数据库设置，使用 NodeJS 作为后端（使用 ejs 作为模板引擎）。
问题是我无法将内容发布到数据库。提交表单时出现错误（POST 方法）。
在建立连接后，Robo 3T上没有显示。
我不确定我哪里出错了。请帮我解决这个问题。
使用的文件附在下面。
目录结构
index.js
/** @format */
//requiring express
const express = require("express");
//setting up the port
const port = 1111;
//this module provides a way to work with directories and file paths
const path = require("path");
//requiring configuration for setting up the database to be accessed by mongoose
const db = require("./config/mongoose");
//requiring Task schema/model
//using this we will create entries and populate our collection
const Task = require("./models/task");
const { create } = require("./models/task");
//firing up express
const app = express();
app.set("view engine", "ejs");
app.set("views", path.join(__dirname, "views"));
app.use(express.urlencoded({ extended: true }));
app.use(express.static(__dirname + "/assets"));
let task_list = [
{
title: "College",
due_date: "2012-12-13",
category: "College"
},
{
title: "Home",
due_date: "2012-12-13",
category: "Home"
},
{
title: "Work",
due_date: "2012-12-13",
category: "Work"
},
{
title: "Group",
due_date: "2012-12-13",
category: "Group"
},
];
app.get("/", function (req, res) {
Task.find({}, function (err, task) {
if (err) {
console.log("Error occured!");
return;
}
return res.render("home", {
tasks: task
});
});
});
app.post("/new-task", function (req, res) {
console.log(req.body);
Task.create(
{
title: req.body.title,
due_date: req.body.due_date,
category: req.body.category
},
function (err, newt) {
if (err) {
console.log("Error while posting");
return;
}
console.log("Newtask created!: ", newt);
return res.redirect("back");
}
);
});
//creating a listener to the specified port
app.listen(port, function (err) {
if (err) {
console.log(`Some error occured at port: ${port}
Please try again later`);
return;
}
console.log("Yay! Server is running at @ port:", port);
});
注意：我使用 task_list 数组来检查帖子是否正常工作并且它正在工作。但是当我尝试使用持久性数据库 (MongoDB) 时，就会出现问题。
mongoose.js（用于连接数据库）
//requiring mongoose to set up connection with database
const mongoose = require('mongoose');
//setting up connection
mongoose.connect('mongodb://localhost:27017/tasks_db', {useNewUrlParser: true, useUnifiedTopology: true});
//to check if the connection is successful or some error occured
const db = mongoose.connection;
db.on('error', console.error.bind(console, "!! Error setting up connection with database !!"));
db.once('open', function() {
console.log("Connection with database is successful!");
});
task.js（包含架构）
//requiring mongoose
const mongoose = require('mongoose');
//creating the schema for the document of collection
const taskSchema = new mongoose.Schema({
title: {
type: String,
required: true
},
due_data: {
type: Date,
required: true,
get: value => value.toDateString()
},
category: {
type: String,
}
});
//compiling our schema into a model (a class for interacting with MongoDB) (an instance of model is called a document)
const Task = mongoose.model('Task', taskSchema);
module.exports = Task;
home.ejs（包含视图）
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Your TO-DO List</title>
<script src="https://kit.fontawesome.com/fcba9de078.js" crossorigin="anonymous"></script>
<link rel="stylesheet" href="/css/style.css" />
</head>
<body class="toggler">
<!-- The main box containing the list and the form to add or remove item -->
<div id="todo-box-div" class="flex-row sizi">
<!-- div containing form for adding items to todo-list -->
<div id="todo-form-div" class="flex-column sizi">
<!-- div header -->
<h1>Do It!</h1>
<!-- form for adding items -->
<form action="/new-task" method="POST" id="to-do-form" class="flex-column up-down">
<input id="title" name="title" class="bottom-b font-4" type="text" placeholder="I have to do this..." required />
<!-- <textarea id="description" class="bottom-b font-4" type="text"></textarea> -->
<!-- date and category will be inline for bigger widths -->
<div id="input-inline" class="flex-row">
<input id="date" name="due_date" min="2020-07-20" class="bottom-b font-2" type="date" required />
<select id="category" name="category" class="bottom-b font-2 dropdown" type="text">
<option value="default" selected disabled>Choose a category</option>
<option value="Work">Work</option>
<option value="College">College</option>
<option value="Home">Home</option>
<option value="Group">Group</option>
</select>
</div>
<!-- button for adding item -->
<button type="submit" class="font-4" id="add"><i class="fas fa-plus"></i>Add to list</button>
</form>
</div>
<!-- div containing list items (scrollable) and button to delete items -->
<div id="todo-list-div" class="flex-column sizi">
<!-- button for deleting items -->
<button type="submit" class="font-4" id="delete"><i class="far fa-trash-alt"></i>Done</button>
<!-- list containing todo items -->
<ul>
<% for(let a of tasks) { %>
<li>
<div class="list-item">
<input type="checkbox" class="pointer" />
<div class="name-date font-3">
<p><%= a.title %></p>
<p><i class="far fa-calendar-alt"></i><%= a.due_date %></p>
</div>
<div id="redundant"></div>
<div class="categ-button font-2 disp"><%= a.category %></div>
</div>
</li>
<% } %>
</ul>
</div>
</div>
<script src="/js/script.js"></script>
</body>
</html>
注意：表单在todo-box-div下的todo-form-div中。
示例错误：
在这里，如果您在提交表单时看到它正在打印“发布时出错”。 req.body 正在打印。此错误信息在 index.js 中 app.post() 方法的错误处理中。
我被困了太久，决定在这里发布并获得一些指导。请帮我解决这个问题。
【问题讨论】：
标签： node.js mongodb express mongoose ejs