Saving Related Data in CakePHP 3 Controller - orm

Question

In the documentation exactly says that associated data can be saved like:
use App\Model\Entity\Article;
use App\Model\Entity\User;
$article = new Article(['title' => 'First post']);
$article->user = new User(['id' => 1, 'username' => 'mark']);
$articles = TableRegistry::get('Articles');
$articles->save($article);
I tried this in my code but I get error:
Fatal Error
Error: Class 'App\Controller\TableRegistry' not found
File /Users/mtkocak/Sites/gscrm/src/Controller/BusinessesController.php
Line: 62
Here is my controller code. I am doubt that above code is valid for entity models.
public function add() {
$business = $this->Businesses->newEntity($this->request->data);
$record = new Record($this->request->data['Records']);
$address = new Address($this->request->data['Addresses']);
$telephone = new Telephone($this->request->data['Telephones']);
$email = new Email($this->request->data['Emails']);
$record->business = $business;
$record->address = $address;
$record->email = $email;
if ($this->request->is('post')) {
var_dump($this->request->data['Records']);
$records = TableRegistry::get('Records');
$records->save($record);
// if ($this->Businesses->save($business)) {
// $this->Flash->success('The business has been saved.');
// return $this->redirect(['action' => 'index']);
// } else {
// $this->Flash->error('The business could not be saved. Please, try again.');
// }
}
$telephonetypes = $this->Businesses->Records->Telephones->Telephonetypes->find('list');
$records = $this->Businesses->Records->find('list');
$businesstypes = $this->Businesses->Businesstypes->find('list');
$this->set(compact('telephonetypes','business', 'records', 'businesstypes'));
}
Here is my sql dump of table:
CREATE TABLE IF NOT EXISTS `businesses` (
`id` int(10) unsigned NOT NULL,
`record_id` int(10) unsigned DEFAULT NULL,
`businesstype_id` int(10) unsigned DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_turkish_ci AUTO_INCREMENT=1 ;
ALTER TABLE `businesses`
ADD PRIMARY KEY (`id`), ADD KEY `FK_businesses_records` (`record_id`), ADD KEY `FK_businesses_businesstypes` (`businesstype_id`);
Any help is appreciated.

Answer 1

You are missing a use statement. All these examples in the book take for granted that you've started reading the tables section from the beginning and make use of:
http://book.cakephp.org/3.0/en/orm/table-objects.html#getting-instances-of-a-table-class
use Cake\ORM\TableRegistry;
ps. you don't have to build the entities manually when following the naming conventions
http://book.cakephp.org/3.0/en/orm/table-objects.html#converting-request-data-into-entities
http://book.cakephp.org/3.0/en/views/helpers/form.html#field-naming-conventions
http://book.cakephp.org/3.0/en/orm/table-objects.html#avoiding-property-mass-assignment-attacks