nodejs adding mongo connection to global

Question

nodejs adding mongo connection to global

Im adding the mongo connection at server start to my global obj to access to it from any file

// app.js
mClient.connect(mongoUrl, function(err, db) {
  global.mongo = db;
});

and using it like this

// store.js  
global.mongo.collection(thisColl, function(err, collection) {
  if (err) return self.emit("error", "collection not found");

  collection.find(query, select).toArray(function(err, stores) {
    if (err || !stores) return self.emit("error", "result not found");

    return self.emit("done", stores);
    });
  });

but sometimes im getting and error that get fixed alone, I dont know how

// Error
{"code":"InternalError","message":"Cannot call method 'collection' of undefined"}

Im doing this becouse it doesnt open/close a connection on every request

node.js
mongodb

Answer 1

I manage to make it work, maybe not the better way but works

// Create MongoDB connection
mClient.connect(mongoUrl, function(err, db) {
  global.mongo = db;
  // Start HTTP server  
  server.listen(4000, function() {
    console.log("%s listening at %s", server.name, server.url);
  });
});