loopback/lib/models/model.js

/**
 * Module Dependencies.
 */

var ModelBuilder = require('loopback-datasource-juggler').ModelBuilder;
var modeler = new ModelBuilder();

/**
 * Define the built in loopback.Model.
 */

var Model = module.exports = modeler.define('Model');

Model.shared = true;

/*!
 * Called when a model is extended.
 */

Model.setup = function () {
  var ModelCtor = this;
  
  // each model has its
  // own access control
  // list
  ModelCtor.acl = [];
  
  ModelCtor.sharedCtor = function (data, id, fn) {
    if(typeof data === 'function') {
      fn = data;
      data = null;
      id = null;
    } else if (typeof id === 'function') {
      fn = id;
    
      if(typeof data !== 'object') {
        id = data;
        data = null;
      } else {
        id = null;
      }
    }
  
    if(id && data) {
      var model = new ModelCtor(data);
      model.id = id;
      fn(null, model);
    } else if(data) {
      fn(null, new ModelCtor(data));
    } else if(id) {
      ModelCtor.findById(id, function (err, model) {
        if(err) {
          fn(err);
        } else if(model) {
          fn(null, model);
        } else {
          err = new Error('could not find a model with id ' + id);
          err.statusCode = 404;
        
          fn(err);
        }
      });
    } else {
      fn(new Error('must specify an id or data'));
    }
  }

  // before remote hook
  ModelCtor.beforeRemote = function (name, fn) {
    var self = this;
    if(this.app) {
      var remotes = this.app.remotes();
      remotes.before(self.pluralModelName + '.' + name, function (ctx, next) {
        fn(ctx, ctx.result, next);
      });
    } else {
      var args = arguments;
      this.once('attached', function () {
        self.beforeRemote.apply(self, args);
      });
    }
  }
  
  // after remote hook
  ModelCtor.afterRemote = function (name, fn) {
    var self = this;
    if(this.app) {
      var remotes = this.app.remotes();
      remotes.after(self.pluralModelName + '.' + name, function (ctx, next) {
        fn(ctx, ctx.result, next);
      });
    } else {
      var args = arguments;
      this.once('attached', function () {
        self.afterRemote.apply(self, args);
      });
    }
  }

  // Map the prototype method to /:id with data in the body
  ModelCtor.sharedCtor.accepts = [
    {arg: 'id', type: 'any', http: {source: 'path'}}
    // {arg: 'instance', type: 'object', http: {source: 'body'}}
  ];

  ModelCtor.sharedCtor.http = [
    {path: '/:id'}
  ];
  
  ModelCtor.sharedCtor.returns = {root: true};
  
  return ModelCtor;
}

// setup the initial model
Model.setup();