Customize Model.sharedCtor

server.js

var loopback = require('loopback');
var boot = require('loopback-boot');

var app = module.exports = loopback();

// hack sharedCtor

var setup = loopback.PersistedModel.setup;
loopback.PersistedModel.setup = function(rec) {
  var extend = require('util')._extend;
  var modelName = this.modelName;

  console.log('setting up', modelName, new Error().stack);

  setup.apply(this, arguments);
  var sharedCtor = this.sharedCtor;

  this.sharedCtor = function(id, req, cb) {
    console.log('custom sharedCtor for', modelName, id);

    if (typeof(id) === 'object' || typeof(req) !== 'object') {
      // non-remoted call `sharedCtor(data, id, cb)`
      return sharedCtor.apply(this, arguments);
    }

    req.pause();
    sharedCtor.call(this, id, function() {
      req.resume();
      cb.apply(this, arguments);
    });  
  };

  extend(this.sharedCtor, {
    shared: true,
    accepts: [
      { arg: 'id', type: 'any', http: {source: 'path'}, description: modelName + ' id' },
      { arg: 'req', type: 'Object', http: { source: 'req' } }
    ],
    http: {path: '/:id'},
    returns: { root: true}
  });  

  if (!rec) this.setup(true);
};

// business as usual - setup middleware, start the app

app.use(loopback.favicon());

// request pre-processing middleware
app.use(loopback.compress());

// -- Add your pre-processing middleware here --

// boot scripts mount components like REST API
boot(app, __dirname);

// -- Mount static files here--
// All static middleware should be registered at the end, as all requests
// passing the static middleware are hitting the file system
// Example:
//   app.use(loopback.static(path.resolve(__dirname', '../client')));

// Requests that get this far won't be handled
// by any middleware. Convert them into a 404 error
// that will be handled later down the chain.
app.use(loopback.urlNotFound());

// The ultimate error handler.
app.use(loopback.errorHandler());

app.start = function() {
  // start the web server
  return app.listen(function() {
    app.emit('started');
    console.log('Web server listening at: %s', app.get('url'));
  });
};

// start the server if `$ node server.js`
if (require.main === module) {
  app.start();
}