[ { _id: 57682f69feaf405c51fdf144,
    email: 'testuser1@testdomain.com',
    username: 'testuser' },
  { username: 'sevilayha', _id: 5768d36c4c243de7422f681e, __v: 0 } ]

// With Mongoose, everything is derived from a Schema. Let's get a reference to it and define our users.
var userSchema = mongoose.Schema({
    name: String,
    username: { type: String, required: true, unique: true },
    password: { type: String, required: true },
    admin: Boolean,
    location: String,
    meta: {
      age: Number,
      website: String
    },
    created_at: Date,
    updated_at: Date
});

// The next step is compiling our schema into a Model.
var User = mongoose.model('User', userSchema);

app.get("/", function(req, res) {
  var updateQuery = {
    date: Date.now()
  };
  User.findOne({ username: /^sevilayha/ }, function (err, user) {
    if (err) return console.error(err);
    user.update({
      $push: updateQuery,
      $set: { size: 'large' },
      email: 'test@example.com'
    });
    res.status(200).json(user);
  });
  User.find(function (err, users) {
    if (err) return console.error(err);
    console.log(users);
  });

});