router.put('/user', function(req, res) {
  //  db object is already added to req object when express is initialised
  const db = req.db;
  const { userId, userName, userEmail } = req.body
  try {
    await updateUserService({
      db,
      updateParams: {
        userId,
        userName,
        userEmai
      }
    })
  } catch (ex) {
    switch (ex.name) {
      case 'InvalidParamsException':
        res.status(400).send('Missing required params')
        return
      case 'UserNotFoundException':
        res.status(404).send('User not found')
        return
      case 'DatabaseErrorException':
        res.status(500).send('Db error')
        return
      default:
        res.status(500).send('Unknown error')
        return
    }
  }
  res.status(200).send('User updated')
})