MongoDb Data Mapper

What ?

A data mapper is an abstraction on top of a persistence mechanism. It works as a bridge between domain entities and a data store.

Why ?

MongoDb Data Mapper is easier to test alternative to popular Active Record-based ORMs. It achieves so by exposing a minimalist (therefore trivial to mock) API and providing set-up/tear-down methods.

How ?

const coroutine = require('co');
const mongoDataMapper = require('mongodb-datamapper');
 
const petsDataMapper = mongoDataMapper({
  connectionUri: 'mongodb://localhost/test',
  collectionName: 'pets',
});
 
coroutine(function* () {
  // Always `initialize` before querying.
  yield petsDataMapper.initialize();
 
  const herPets = yield petsDataMapper.find({ owner: 'Sabrina' });
 
  herPets.forEach(p => console.log(p.name));
 
  // `destroy` mapper once you're done.
  yield petsDataMapper.destroy();
});

Using with your transform-s:

const coroutine = require('co');
const mongoDataMapper = require('mongodb-datamapper');
 
const student = require('./my-awesome-domain/student');
 
const studentsDataMapper = mongoDataMapper({
  transform: student,
  connectionUri: 'mongodb://localhost/test',
  collectionName: 'students',
});
 
coroutine(function* () {
  yield studentsDataMapper.initialize();
 
  const allStudents = yield studentsDataMapper.find();
  const studentsWithHighScores = allStudents.map(s => s.averageScore > 90);
 
  studentsWithHighScores.forEach(s => {
    s.showOffGoldenStars(); // Assume `student#showOffGoldenStars`
  });
 
  yield studentsDataMapper.destroy();
});