How use Mongoose on inner npm module

How can I use a Mongoose already opened connection inside an npm module that resides in /node_modules?

For instance:

• app
  • common
    • db.js
  • node_modules
    • a_module
      • models
        • a_model.js
      • index.js
  • app.js

app.js trigger opens a connection by requiring common/db.js and executing a connect() method.

Later in app.js a call is made to a_model/index.js where is required the a_model.js file and then is issued a findOne() call that never gets executed since it detects that no connection is open so the call is enqueued forever and never executes.

I already checked that the connection is already opened by checking the logs so the issue is other.

It's worth to note that I was able to get a similar setup working fine but instead of having a_module to be a npm module it was a regular directory below the app folder.

SOLUTION

Finally I got this working properly with the help of the awesome guys below.

By using the global nodejs object I was able to expose the db connection without clutter the code:

db.js:

global.db = mongoose;

a_model.js:

mongoose = global.db;

and voilá!

Reference: http://productbuilder.wordpress.com/2013/09/06/using-a-single-global-db-connection-in-node-js/