Ember-data hasMany computed properties test

gistfile1.js

test("filtered property on hasMany assoctiation", function() {

  var File = DS.Model.extend({
    primaryKey: 'name',
    name: DS.attr('string'),
    status: DS.attr('string')
  });

  var Project = DS.Model.extend({
    primaryKey: 'name',
    name: DS.attr('string'),
    files: DS.hasMany(File, {embedded: true}),

    added: function() {
      return this.get('files').filter(function(f) { return (f.get('status') == 'added') });
    }.property('files'),

    changed: function() {
      return this.get('files').filter(function(f) { return (f.get('status') == 'changed') });
    }.property('files'),

    deleted: function() {
      return this.get('files').filter(function(f) { return (f.get('status') == 'deleted') });
    }.property('files'),

    hasDeleted: function() {
      return !!this.getPath('deleted.length');
    }.property('deleted.length')
  });

  var store = DS.Store.create({revision: 4});

  store.load(Project, 'chimp', { name: 'chimp', files: [
    { name: '.chimprc', status: 'added' }, 
    { name: '.rvmrc', status: 'added' },
    { name: 'config.ru', status: 'changed' },
    { name: 'index.php', status: 'deleted' }
  ] });

  var project = store.find(Project, 'chimp');
  equal(project.get('name'), 'chimp', 'found the project with the right name');
  equal(project.getPath('files.length'), 4, 'has the correct number of files');
  equal(project.getPath('added.length'), 2, 'has the correct number of added files');
  equal(project.getPath('changed.length'), 1, 'has the correct number of changed files');
  equal(project.getPath('deleted.length'), 1, 'has the correct number of deleted files');
  equal(project.get('hasDeleted'), true, 'hasDeleted helper is accurate');

  project.get('deleted')[0].set('status', 'changed');

  equal(project.getPath('deleted.length'), 0, 'filtered hasMany properties are updated if children are updated');
  equal(project.get('hasDeleted'), false, 'hasDeleted helper is accurate after update');
});