title: Accessing current user on ExpressJs - Passport
body: <p>I'm creating a backend app using expressJs and passportjs (local strategy) to secure some of the routes.
  I need to add the information for the current user on every Database query so we only expose the relevant information to each user.
  I know you can access the information for current user checking req.user, but that will involve passing the user information (or even the request) as a parameter through all my call-stack, and I found it a bit inconvenient.</p>
  
  <p>Is there to get the user information on the last layer (the one preparing the sql statement) without adding it on the parameters?. </p>
  
  <p>Thanks.</p>