mongoi.js

var mongoi = require('mongoi');

// connect to test database
mongoi.connect('mongodb://localhost/test');

// register generic middleware
mongoi.use(function(context, next) {
  // do some logging
  next();
});

// register accounts specific middleware
mongoi.accounts.use(function(context, next) {
  if (context.method === 'fetch') {
    // map context.document on Model prototype to model
  } else {
    // validate context.document
  }

  next();
});

// register accounts specific middleware only on destroy operations
mongoi.accounts.use('destroy', function(context, next) {
  // remove related documents

  next();
});

// do find query
mongo.accounts.find({ age: { gt: 18, lt: 30 } }, function(err, result) {
    if (err) throw err;
    
    process.stdout.write(JSON.stringify(result));
});