mongoose problem

// in models/user.js
var mongoose = require('mongoose');

var Schema = mongoose.Schema
  , ObjectId = mongoose.SchemaTypes.ObjectId
 
// example model
var UserSchema = new Schema({
  email: { type: String, unique: true, index: true }
});

// more statics and virtuals here

var User = mongoose.model('User', UserSchema);
module.exports.User = User;

/* -------------------------------- */

// in app/oauth.js

var mongoose = require('mongoose')
  , User = require('./models/user').User
  , everyauth = require('everyauth')
  , mongooseAuth = require('mongoose-auth')

UserSchema.plugin(mongooseAuth, {
  everymodule: {
    everyauth: function() {
       return User;  // maybe I should be doing return new User() here?
    }
  },
  google: {
    everyauth: {
      findOrCreateUser: function (session, token, secret, googleUser) {
        var promise = this.Promise()
        User.findById(session.userId, function (err, user) {
          if (err) return promise.fail(err);
          if (!user) {
             User.where('email', googleUser.email).findOne( function (err, user) {
               /*** PROBLEM IS HERE ***/
               user.google <= undefined
               user._doc.google => OK
             }
           }
         }
      })
etc.