【发布时间】：2017-11-19 22:08:09
【问题描述】：
我正在尝试将数据从 POSTMAN 发布到我在 mLab 上创建的外部数据库，但我收到错误 db.collection is not a function。
有一个类似的问题线程，但答案不完整，并且没有将我放入邮递员的任何键/值保存到 mLab。我正在尝试制作的代码来自本教程：https://medium.freecodecamp.com/building-a-simple-node-js-api-in-under-30-minutes-a07ea9e390d2
我的代码：
服务器.js
const express = require('express'); // Load routes application
const MongoClient = require('mongodb').MongoClient; //Load database connection application
const db = require('./config/db');
const app = express(); // Assign express app a variable
const port = 8000; //Set local port value for server
const bodyParser = require('body-parser'); // **This has to come BEFORE routes
var assert = require('assert'); // ?
var databaseURL ='mongodb://external:api@ds123312.mlab.com:23312/soundfactory';
app.listen(port, () => {
console.log('')
console.log('We are live on ' + port);
console.log('')
});
MongoClient.connect(databaseURL, function(err, db) {
assert.equal(null, err);
console.log("API has succesfully connected to Sound Facotry mlab external database.");
console.log('')
db.close();
});
app.use(bodyParser.urlencoded({ extended: true }))
require('./app/routes')(app, {}); //Must come AFTER express w/ body parser
db.js
module.exports = {
url : 'mongodb://external:api@ds123312.mlab.com:23312/soundfactory'
};
index.js
const noteroutes = require('./note_routes');
module.exports = function(app,db)
{
noteroutes(app,db);
};
note_routes.js
module.exports = function(app, db) {
app.post('/notes', (req, res) => {
const note = { text: req.body.body, title: req.body.title };
db.collection('notes').insert(note, (err, result) => {
if (err) {
res.send({ 'error': 'An error has occurred' });
} else {
res.send(result.ops[0]);
}
});
});
};
部分正确的代码
server.js（部分有效且不会像我原来的 server.js 文件那样抛出 db.collections 错误的代码）
const express = require('express');
const MongoClient = require('mongodb').MongoClient;
const bodyParser = require('body-parser');
const db = require('./config/db');
const app = express();
const port = 8000;
app.use(bodyParser.urlencoded({extened:true}));
MongoClient.connect(db.url,(err,database) =>{
if (err) return console.log(err)
//require('./app/routes')(app,{});
//check below line changed
require('./app/routes')(app, database);
app.listen(port,() => {
console.log("We are live on"+port);
});
})
【问题讨论】：
-
您将一个空对象从 server.js 传递给 index.js，然后传递给 note_routes.js 作为 db 参数，您尝试将其用作 db.collection 但 db 是空对象，它不会'没有集合属性。
-
尝试检查 package.json 中 mongodb 的依赖关系
标签： node.js mongodb postman restful-architecture database