title: Mongoose Schema.Types.Mixed not working
body: <ol>
  <li><p>Using mongoose schema.types.Mixed to read existing collections do not recognized the key/value pairs, the console only show "_id" but when trying to access the other key/values I get an undefined</p>
  
  <pre><code>var UserSchema1 = new mongoose.Schema({ key: {}});
  var UserSchema2 = new mongoose.Schema({
  userID: Number,
  userName: String,
  password: String});
  var User = mongoose.model('user', UserSchema1,'info' );
  router.get('/', function(req, res) {
  User.find({}, function(err, docs) {
  var s = docs;
  console.log(s[0].userName);
  console.log(s[0]._id);
  res.render('userinfo', {users : docs});
  });
  });
  ---- OUTPUT ----
                                  **UserSchema1**         -     **UserSchema2**
   console.log(s[0].userName);       undefined                  mongo
  console.log(s[0]._id);             241245j23j6l26l6       afa88asf8989asfa
  
  --jade.js--
  ul
      each user in users
    li #{user._id}
    li #{user['userName']}
  
   Shows only  li with the _id 
   but it creates empty  li  supposedly for user.name  
  </code></pre></li>
  </ol>