Inserir registro em 2 tabelas

Estou tentando inserir registro em 2 tabelas (distributions e countries).

Estou usando CakePHP 3.5 e as tabelas do banco estão mais ou menos assim

	- Distributions (id, name);

	- Countries (id, distributions_id, name);

	 

	**DistributionsController:**

 public function add() {
 $topic = $this->Distributions->newEntity();
 if($this->request->is('post')) {
 $topic = $this->Distributions->patchEntity($topic, $this->request->data);
 if($this->Distributions->save($topic, ['associated'=>'Countries'])) {

 $this->request->data['Countries']['distributions_id'] = $this->Distributions->id;

 $this->Flash->success(__('Cadastrado.'));
 return $this->redirect(['action' => 'add']);
 }
 $this->Flash->error(__('Erro.'));
 }
 $this->set('topic', $topic);
 }

	**DistributionsTable:**

class DistributionsTable extends Table {

 public function initialize(array $config) {
 parent::initialize($config);

 $this->table('distributions');
 $this->primaryKey('id');
 $this->addBehavior('Timestamp');

 $this->hasOne('Countries', [
 'foreignKey' => 'distributions_id',
 'joinType' => 'INNER'
 ]);

}

	**Add.ctp (view add em distributions)**

<h1>Add Topic</h1>
<?php
echo $this->Form->create($topic);
 echo $this->Form->input('name');
 echo $this->Form->input('countries.name');
 echo $this->Form->button(__('Salvar'));
echo $this->Form->end();
?>

	**CountriesTable:**

class CountriesTable extends Table {

	public function initialize(array $config) {
 parent::initialize($config);

 $this->table('countries');
 $this->primaryKey('id');
 $this->addBehavior('Timestamp');

 $this->belongsTo('Distributions');

	}