3.0 update/save complex relations

I've started playing with new cakephp ORM functionality and i stuck with complex relation updates/saves.

Example relations look like this:

Customer hasMany CustomerDetails

CustomerDetails hasMany Attributes

Attributes hasMany AttributeValues

CustomerController:: view() action pases $customer entity variable (contains all relations) to view. 

Variable is then used in view to echo entity data but also is passed to Form->create($customer) to edit part of the data

I build my forms using notation below:

$this->Form->hidden("id");

$this->Form->text("customer_details.0.attributes.0.attribute_values.0.name")

After user sends data i want to populate all $customer entity variable with $this->request->data then try to save it and finally pass to view again (this way all related entities should have validation errors included):

 public function view($customer_id){

   

    $this->Customers = TableRegistry::get ( 'Customers' );

    /* @var $customer Customer */

    $customer=$this->Customers->find()->where(['Customers.id'=>$customer_id])->contain(["CustomerDetails"=>["Attributes"=>["AttributeValues"]]])->first();

    if($this->request->is("post")){

    $customer->populate($this->request->data,['associated'=>['CustomerDetails'=> ['associated' => ['Attributes'=> ['associated' => ['AttributesValues']]]]]]); //hydrate??

    if($this->Customers->save($customer,['associated'=>['CustomerDetails'=> ['associated' => ['Attributes'=> ['associated' => ['AttributesValues']]]]]])){

    //Yay

    }

    }

    $this->set(compact('customer'));

    }

$this->request->data looks like this after send:

	'id' => '1',  	'customer_details' => array(  		(int) 0 => array(  			'id' => '1',  			'attributes' => array(  				(int) 0 => array(  					'id' => '1',  					'attributes_values' => array(  						(int) 0 => array(  							'string_value' => 'test test test'  						)  					)  				),  				(int) 1 => array(  					'name' => 'love',  					'attributes_values' => array(  						(int) 0 => array(  							'string_value' => 'me'  						)  					)  				)  			)  		)  	),

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