I know this has been asked and answered before, but I've read a lot of the answers, done a lot of googling and still can't seem to figure out what's going on.
I want to make a todo list app using node and mongodb using docker. I have a docker-compose file like this
local:
image: local
ports:
- "3000:3000"
volumes:
- ./:/project
links:
- mongo
# runs nodemon server.js
entrypoint: ["npm", "run", "start"]
mongo:
image: mongo:latest
ports:
- "27017:27017"
volumes:
- ./data/db:/data/db
entrypoint: ["mongod", "--port", "27017"]
I was very careful to make sure that I'm connecting mongoose like this mongoose.createConnection('mongodb://mongo:27017'); instead of with localhost. However, when I try to POST to my /tasks route in Postman nothing happens. The whole server.js file is
const express = require('express');
const app = express();
const port = process.env.PORT || 3000;
const mongoose = require('mongoose');
const Task = require('./api/models/todoListModel');
const bodyParser = require('body-parser');
mongoose.Promise = global.Promise;
mongoose.createConnection('mongodb://mongo:27017');
// I've also tried mongodb://mongo/local:27017 and /project just in case...
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
const routes = require('./api/routes/todoListRoutes');
routes(app);
app.get('/', (req, res) => {
res.json({ message: 'At least this works...' });
});
app.listen(port);
console.log(`listening on port ${port}`);
Thanks for any help you can offer!
Update - The answer below is basically correct. I did need to wait for mongo to be up before using the server. But I didn't understand that in this case I could just delay listening on the server to make it work. The following seems to work correctly.
const express = require('express');
const app = express();
const mongoose = require('mongoose');
const mongo = 'mongodb://mongo:27017'
mongoose.connect(mongo);
mongoose.Promise = global.Promise;
const db = mongoose.connection;
db.on('error', (err) => {
console.log(`DB Error -> ${err}`);
})
app.get('/', (req, res) => {
res.send('Hello world');
});
/*
Note that the server can be constructed in advance.
It only begins actively listening once the mongo/mongoose connection is fully open.
This way you don't have to use an external script to wait for the ports to open.
*/
db.once('open', () => {
app.listen(3000, () => {
console.log('App is listening on 3000');
});
});
