Change database connection depending on route in express.js with sequelize

问题

Is it possible to change the database connection in sequelize depending on the route?

For example, Users have access to 2 different installations in a website: - example.com/foo - example.com/bar

Upon login users are redirected to example.com/foo To get all their tasks for the foo site, they need to visit example.com/foo/tasks

The bar site uses a separate database and thus if they want to get all their tasks for bar they have to go to example.com/bar/tasks

Every installation has its own database, and all databases have the same schema.

Is it possible to change the database connection depending on which route is visited?

*login only occurs once

回答1:

This is possible. There are a number of ways to do this. Here's how I might approach it.

Router.js

var router = express.Router()
// This assumes the database is always the 2nd param, 
// otherwise you have to enumerate
router.use('/:database/*', function(req, res, next){
  req.db = req.params.database;
  next();
}

Connection.js

var fooDB = new Sequelize('postgres://user:pass@example.com:5432/foo');
var barDB = new Sequelize('postgres://user:pass@example.com:5432/bar');
module.exports = {
  foo: fooDB,
  bar: barDB,
}

Tasks.js

 var connection = require('connection);
 function getTasks(req, params){
   var database = connection[req.db]; 
   //database now contains the db you wish to access based on the route.
 }

That said, there are some interesting problems you'll have to face when you want to duplicate the schema across both, but that's probably best for another question.

I hope this helps!