Loopback : Model access non-related model via App object

restaurants.js

'use strict';
var app = require('../../server/server');
module.exports = function(Restaurant, app) {
  
  // Restaurant.validatesUniquenessOf('UUID', {message: 'UUID EXISTS'});
  
  Restaurant.observe('before save', function setDefaultUsername(ctx, next) {
    if (ctx.instance) {
      if(!ctx.instance.created){
        ctx.instance.created = Date.now();
      }
      ctx.instance.updated = Date.now();
    }
    next();
  });
  
  Restaurant.observe('loaded', function logQuery(ctx, next) {
    console.log('RETURNING %j', ctx.instance);
    next();
  });
  
  
  Restaurant.getChildren = function(id,cb) {
    
    var filter = { include : [ 'DETAILS'] };
    // get the restaurant
    Restaurant.findById(id, filter, function(err, restaurant) {
      if(err) {
        console.log(err);
      } else {
        // get the Generics
        var Rapp =  Restaurant.app;
        var GenericModel = Rapp.models.Generic;
        GenericModel.find({ where: { UUID : id } },  function(err, generics) {
          if(err) {
            console.log(err);
          } else {
            restaurant.children = generics;
            cb(null, restaurant);
          }
        });
      }
    });
  };
  
  Restaurant.remoteMethod('getChildren', {
    accepts: [{arg: 'id', type: 'string'}],
    returns: {arg: 'FULLOBJECT', type: 'object'},
    http: {path:'/withChildren/:id', verb: 'get'}
  });

};