Simple class that may be used to create a pool of mongoose connections with unique MongoURIs

gistfile1.js

var mongoose = require('mongoose');
var UserSchema = require(__dirname + '/user-schema');

var DatabasePool = function () {
  this.dbs = {};
};

// gets a connection to a specific mongo uri string, or
// creates it if it doesn't exist, or isn't connected
// Then attaches "User" Model to the connection
DatabasePool.prototype.getDb = function (uri) {
  if (!uri) { return throw new Error('must supply uri!'); }
  if (this.dbs[uri] && (this.dbs[uri].readyState === 1 || this.dbs[uri].readyState === 2)) {
    return this.dbs[uri];
  }
  this.dbs[uri] = mongoose.createConnection(uri/*, get options from config */);
  this.dbs[uri].model('User', UserSchema);
  return this.dbs[uri];
};

module.exports = new DatabasePool();