trying multi tennt mongo express

tenant.js

/**
 * Scoping by tenant_id on every documents
*/

// app.js
app.use(getTenantId())

function getTenantId(req, res, next) {
  db.organisation.find({subdomain: req.subdomain}, function(err, doc) {
    if(err) next(err);
    req.tenantId = {tenant_id: doc._id};
    next();
  });
}

// userController.js

var User = require('../models/user');
var _ = require('lodash');


exports.index = function (req, res) {
  var query = {}
  var queryWithTenant = _.merge(query, req.tenantId)
  User.find(queryWithTenant, function(err, docs) {
    if(err) res.send(404);
    res.jsonp(docs)
  });
};

/**
 * Prefixing every collection's name with tenant id or name ( more readable )
*/


// userController.js
var User = require('../models/user');

exports.index = function (req, res) {
  // not sure how to do that in with moongose... but with mongo
  var subdomain = req.subdomain;
  var colName = subdomain+'_user';
  db[colName].find({}, function(err, docs) {
    if(err) res.send(404);
    res.jsonp(docs)
  });
};