function quizQuestions(req, res) {
  const query = {
    limit: 10,
    order: [ [sequelize.fn('RANDOM')] ],
    where: {
      id: { $ne: [1, 2, 3] } // This does not work
    }
  };

  Question.findAll(query)
  .then(results => res.status(200).json(map(results, r => r.dataValues)))
  .catch(err => res.status(500).json(err));
}