async register (req, res) {
    if (!_.has(req.body, 'email') || !_.has(req.body, 'password') || !_.has(req.body, 'username')) {
      return res.serverError('No field should be empty')
    } else {
      bcrypt.hash(req.body.password, 10, (err, hash) => {
        if (err) return res.serverError(err)
        let user = await User.create({ username: req.body.username, email: req.body.email, password: hash }).fetch()
        return res.json(user)
      })
    }
  }