Angularjs Models with Restangular

gistfile1.js

angular.module('board_app')
  .controller('test_controller', function ($scope, Restangular) {
    
    
    Restangular.extendModel('test_board_lists', function(model) {
       model.prettyName = function() {
         return "BoardList " + model.name;
       };

       return model;
     });
     
     function Board(model) {
       if (!model || !model.hasOwnProperty('restangularCollection')) return Board.create(model);
       if (model.board_lists) Restangular.restangularizeCollection(model, model.board_lists, 'test_board_lists');

       this.api_url = 'test_boards';
       // Defaults
       var a = {
         name: "Hallo"
       } 

       angular.forEach(a, function(val, key) {
         if (! model[key]) model[key] = val;
       })

       model.prettyName = function() {
         return "Board " + model.name;
       };

       console.log(model);
       return model;
     }
     
     
     Board.create = function(data) {
       var model = Restangular.one('test_boards');
      
       angular.forEach(data, function(val, key) {
         model[key] = val;
       })
       return model;
     }
     
     Restangular.extendModel('test_boards', Board);
     
     var boardPromise = Restangular.one('test_boards', 1).get();
     
     boardPromise.then(function(board) {
       board.board_lists[0].name = 'halllooo';
       board.board_lists[0].put();
       // console.log(board.prettyName(), board.board_lists[0].prettyName());
       // console.log(Object.getOwnPropertyNames(board));
     });

     //console.log(new Board({name: "blub"}).name);
     //console.log(Board.create({name: "create"}).name);

  });