[react] 测试 app.post 创建数据库条目时出现错误代码 HTTP/1.1 500 Internal Server Error
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【中文标题】[react] 测试 app.post 创建数据库条目时出现错误代码 HTTP/1.1 500 Internal Server Error【英文标题】：[react]Getting error code HTTP/1.1 500 Internal Server Error when testing app.post to create a database entry 【发布时间】：2022-01-08 14:08:57 【问题描述】：我正在尝试建立一个显示数据库信息的网站。我的控制器文件有代码
import express from 'express';
import * as exercises from '../REST API/exercises_model.mjs';
const PORT = 3000;
const app = express();
app.use(express.json());
app.post('/exercises', (req, res) =>
exercises.createExercise(req.body.name, req.body.reps, req.body.weight, req.body.unit, req.body.unit, req,body.date)
.then(exercise =>
res.status(201).json(exercise);
)
.catch(error =>
console.error(error);
res.status(400).json( Error: 'Request failed' );
);
);
app.get('/exercises', (req, res) =>
let filter = ;
if(req.query.name !== undefined)
filter = name: req.query.name ;
if(req.query.reps !== undefined)
filter = reps: req.query.reps;
if(req.query.weight !== undefined)
filter = weight: req.query.weight;
if(req.query.unit !== undefined)
filter = unit: req.query.unit;
if(req.query.date !== undefined)
filter = date: req.query.date;
exercises.findExercises(filter, '', 0)
.then(exercises =>
res.json(exercises);
)
.catch(error =>
console.error(error);
res.send( Error: 'Request failed' );
);
);
app.put('/exercises/:_id', (req, res) =>
exercises.replaceExercise(req.params._id, req.body.name, req.body.reps, req.body.weight, req.body.unit, req.body.date)
.then(numUpdated =>
if (numUpdated === 1)
res.json( _id: req.params._id, name: req.body.name, reps: req.body.reps, weight: req.body.weight, unit: req.query.unit, date: req.query.date )
else
res.status(404).json( Error: 'Resource not found' );
)
.catch(error =>
console.error(error);
res.status(400).json( Error: 'Request failed' );
);
);
app.delete('/exercises/:id', (req, res) =>
exercises.deleteById(req.params.id)
.then(deletedCount =>
if (deletedCount === 1)
res.status(204).send();
else
res.status(404).json( Error: 'Resource not found' );
)
.catch(error =>
console.error(error);
res.send( error: 'Request failed' );
);
);
app.listen(PORT, () =>
console.log(`Server listening on port $PORT...`);
);
我的模型文件有以下内容
import mongoose from 'mongoose';
mongoose.connect("mongodb://localhost:27017/exercises_db",
useNewUrlParser: true, useUnifiedTopology: true
);
const db = mongoose.connection;
db.once("open", () =>
console.log("Successfully connected")
);
const exerciseSchema = mongoose.Schema(
name: type: String, required: true,
reps: type: Number, required: true,
weight: type: Number, required: true,
unit: type: String, required: true,
date: type: String, required: true,
);
const Exercise = mongoose.model("Exercise", exerciseSchema);
const createExercise = async (name, reps, weight, unit, date) =>
const exercise = new Exercise(name, reps, weight, unit, date);
return exercise.save();
const findExercises = async () =>
const query = Exercise.find(filter)
.select(projection)
.limit(limit)
return query.exec();
const replaceExercise = async(_id, name, reps, weight, unit, date) =>
const result = await Exercise.replaceOne(_id: _id, name: name, reps: reps, weight: weight, unit: unit, date: date);
return result.nModifed;
const deletebyID = async(_id) =>
const result = await Exercise.deleteOne(_id: _id);
return result.deletedCount;
export createExercise, findExercises, replaceExercise, deletebyID ;
测试时
### Create an exercise
POST http://localhost:3000/exercises HTTP/1.1
content-type: application/json
"name": "Squat",
"reps": 10,
"weight": 30,
"unit": "lbs",
"date": "06-24-21"
### Create another exercise
POST http://localhost:3000/exercises HTTP/1.1
content-type: application/json
"name": "Deadlift",
"reps": 10,
"weight": 30,
"unit": "lbs",
"date": "06-25-21"
### Retrieve should return the 2 exercises we just created
GET http://localhost:3000/exercises HTTP/1.1
### Edit the Deadlift.
### NOTE: Set ID to the ID for Deadlift
PUT http://localhost:3000/exercises/610e523255de4c51c4a3d1db HTTP/1.1
content-type: application/json
"name": "Deadlift",
"reps": 12,
"weight": 30,
"unit": "lbs",
"date": "06-25-21"
### Verify that reps value for Deadlift is now 12
GET http://localhost:3000/exercises HTTP/1.1
### Delete the Deadlift
### NOTE: Set ID to the ID for Deadlift
DELETE http://localhost:3000/exercises/610e523255de4c51c4a3d1db HTTP/1.1
### Verify that the Deadlift exercise has been deleted
GET http://localhost:3000/exercises HTTP/1.1
在测试第一个案例以创建练习时，我收到以下响应。如果不至少创建 1 个条目，我将无法测试其余的案例。如何修复控制器上的 app.post 或模型上的 createExercise 函数以修复此错误并创建条目以继续我的测试。
HTTP/1.1 500 Internal Server Error
X-Powered-By: Express
Content-Security-Policy: default-src 'none'
X-Content-Type-Options: nosniff
Content-Type: text/html; charset=utf-8
Content-Length: 1540
Date: Thu, 02 Dec 2021 02:06:53 GMT
Connection: close
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>ReferenceError: body is not defined<br> at file:///D:/Comp%20Sci/CS%20290%20Web%20Development/Assignment%206/REST%20API/exercises_controller.mjs:11:111<br> at Layer.handle [as handle_request] (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\layer.js:95:5)<br> at next (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\route.js:137:13)<br> at Route.dispatch (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\route.js:112:3)<br> at Layer.handle [as handle_request] (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\layer.js:95:5)<br> at D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\index.js:281:22<br> at Function.process_params (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\index.js:335:12)<br> at next (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\express\lib\router\index.js:275:10)<br> at D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\body-parser\lib\read.js:130:5<br> at invokeCallback (D:\Comp Sci\CS 290 Web Development\Assignment 6\REST API\node_modules\raw-body\index.js:224:16)</pre>
</body>
</html>
【问题讨论】：
您的createExercise() 函数是async，但在返回save() 调用之前您没有使用await。
@pazitos10 但我不需要使用“new”，因为我正在创建一个条目吗？
您的情况类似于docs 中的示例，在该示例中您定义了名为Exercise 的模型，使用new 创建了一个新模型，但是您在返回之前忘记使用await exercise.save()从那个函数。如果这样做，save() 方法需要一个回调函数作为参数，并将返回 undefined。否则，请使用 async/await 才能使用 Promise。更多关于 save()，here
@pazitos10 我注释掉了我的return exercise.save(); 并添加了await exercise.save();，但仍然遇到同样的错误。两者都试过了，也没有任何变化。
您是否在发送响应之前调试了结果以确保对象已被创建？
【参考方案1】：
添加到控制器文件中。
app.use(express.json())
app.use(express.urlencoded(extended: true));
【讨论】：
很高兴你成功了。关于express.json() 和express.urlencoded()，我会将this question 留给未来的读者，这可能会有所帮助。以上是关于[react] 测试 app.post 创建数据库条目时出现错误代码 HTTP/1.1 500 Internal Server Error的主要内容，如果未能解决你的问题，请参考以下文章
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