findone with or condition mongoose code example

Example 1: mongoose find multiple conditions

User.find({$or:[{region: "NA"},{sector:"Some Sector"}]}, function(err, user) 
 {
    if (err)
    {
        res.send(err);
    }
    console.log(user);
    res.json(user);

 });

Example 2: == operation is not working on ids in express

Mongoose uses the mongodb-native driver, which uses the custom ObjectID type.
You can compare ObjectIDs with the .equals() method.
With your example, results.userId.equals(AnotherMongoDocument._id).
The ObjectID type also has a toString() method, if you wish to store a stringified version of the ObjectID in JSON 
format, or a cookie.

If you use ObjectID = require("mongodb").ObjectID (requires the mongodb-native 
library) you can check if results.userId is a valid identifier with 
  results.userId instanceof ObjectID.