var modella = require('modella');
var auth = require('modella-auth');
// Create model
var User = modella('user')
  .attr('id')
  .attr('email')
  .attr('pass');
// Use middleware
User.use(auth({ password: 'pass' }));
// creating
User
  .email('a@b.com')
  .pass('secretz')
  .save(function(err, res) {
    user.pass() // salted password
    user.salt() // hash
  })
// after submitting a form
User.authenticate(id, body.password, function(err, user) {
  if (err) // something went wrong
  else if (!user) // wrong password
  else // all good!
})
// or authenticate an existing user
  User.findOne({email: 'a@b.com'}, function (err, model) {
    User.authenticate(model, '1234', function (err, model) {
      if (err) // something went wrong
      else if (!user) // wrong password
      else // all good!
    });
  });