usersRouter.get('/email/:email', (req, res, next) => {
  const email = req.params.email;
  const getUserByEmail = (email) => {
    return knex('users')
      .select('user_id')
      .where('email', email)
      .then(users => {
        return users[0];
      })
      .catch(err => {
        throw err;
      })
  }

  return getUserByEmail(email)
    .then(user => {
      console.log(user);
      res.status(statuses('OK')).json(user)
    })
    .catch(next)
})